Toyota Prius: Electric Parking Brake System

Toyota Prius (XW60) 2023-2025 Service Manual / Brake / Parking Brake / Electric Parking Brake System

Precaution
Parts Location
System Diagram
How To Proceed With Troubleshooting
Problem Symptoms Table
Terminals Of Ecu
Dtc Check / Clear
Freeze Frame Data
Inspection
VEHICLE CONTROL HISTORY (RoB)
Brake System Control Module "A" System Internal Failure (C059704,C059746,C13CF1C,C13D41C)
Electric Parking Brake Switch Circuit Open (C060913)
Electric Parking Brake Switch Signal Compare Failure (C060962)
Left Electric Parking Brake Actuator Control Circuit Short to Ground (C060B11)
Left Electric Parking Brake Actuator Control Circuit Short to Battery (C060B12)
Left Electric Parking Brake Actuator Circuit Current Above Threshold (C060E19)
Left Electric Parking Brake Actuator Signal Stuck In Range (C060E2A)
Ignition Switch On/Start Position Circuit Short to Ground or Open (C102014)
Electric Parking Brake Actuator Supply Voltage Circuit Voltage Below Threshold (C13B516)
Electric Parking Brake Actuator (C13B800)
Electric Parking Brake does not Operate
Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF
Brake Warning Light (Yellow) Remains On
Electric Parking Brake System AUTO Function Circuit

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

NOTICE:

After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

PRECAUTIONS FOR REMOVAL, INSTALLATION AND REPLACEMENT OF COMPONENTS

(a) After replacing certain components, it may be necessary to update the ECU security key.

Click here

(b) Perform "Calibration" after removal, installation or replacement of any of the following components:

Click here

No. 1 skid control ECU (brake booster with master cylinder assembly)
No. 2 skid control ECU (brake actuator assembly)

TROUBLESHOOTING PRECAUTIONS

(a) When inspecting the rear brakes, disconnect the connector or disconnect the cable from the negative (-) auxiliary battery terminal in order to shut off the supply of electrical power.

CAUTION:

Do not perform the rear brake inspection while either the connector or the negative (-) auxiliary battery terminal are connected.
The rear disc brake piston could operate, resulting in an accident such as hands being caught.

(b) When disconnecting a connector or removing a fuse or relay, make sure that the ignition switch has been off, the brake pedal has not been depressed, and the driver door has been closed for 4 minutes or more*.

*: The electric parking brake may still operate up to 60 minutes depending on the state of the Toyota Prius vehicle after the ignition switch is turned off, so be sure to perform the work procedures with the vehicle on a level surface.

(c) When any parts have been removed or installed, check for DTCs after completion of installation to confirm that the system is operating correctly.

HINT:

After performing work procedures such as installation, if the parking brake indicator light (red) is blinking, the parking brake must be released.

HANDLING PRECAUTIONS

(a) When tilting the Toyota Prius vehicle to perform work after parking the vehicle on a level surface, the braking force may not be sufficient. Make sure to pull the electric parking brake switch (electric parking brake switch assembly) to the lock side 2 times (2 lock operations).

HINT:

The electric parking brake system determines the amount of force used to operate the parking brake according to the tilt angle detected by the acceleration sensor (airbag ECU assembly).
When the parking brake indicator is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

(b) The parking brake indicator light blinks when the ignition switch is turned to ON after replacing the No. 2 skid control ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light.

PRECAUTIONS FOR TOWING Toyota Prius VehicleS

(a) For towing precautions: Click here

PARKING BRAKE FORCED RELEASE METHOD

(a) For the parking brake forced release method: Click here

Parts Location

PARTS LOCATION

ILLUSTRATION

BRAKE ACTUATOR ASSEMBLY

- NO. 2 SKID CONTROL ECU

BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

- NO. 1 SKID CONTROL ECU

NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY

- ABS NO. 2 FUSE

ILLUSTRATION

*1	PARKING BRAKE ACTUATOR ASSEMBLY RH	*2	PARKING BRAKE ACTUATOR ASSEMBLY LH
*3	NO. 1 PARKING BRAKE WIRE ASSEMBLY	*4	NO. 2 PARKING BRAKE WIRE ASSEMBLY
*5	ELECTRIC PARKING BRAKE SWITCH ASSEMBLY	*6	DLC3
*7	COMBINATION METER ASSEMBLY	*8	AIRBAG ECU ASSEMBLY - ACCELERATION SENSOR
*9	POWER DISTRIBUTION BOX ASSEMBLY - ECU-IGR NO. 2 FUSE	*10	HYBRID Toyota Prius Vehicle CONTROL ECU

System Diagram

SYSTEM DIAGRAM

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

*: Use the GTS.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer and confirm the problem.

Click here

3.	INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage with the ignition switch off.

Standard Voltage:

11 to 14 V (Ignition switch off)

If the voltage is below 11 V, replace or recharge the auxiliary battery before proceeding to the next step.

4.	CHECK DTC AND FREEZE FRAME DATA*

(a) Check and record DTCs and freeze frame data.

Chassis > Brake/EPB > Trouble Codes

(b) Clear the DTCs and freeze frame data.

Chassis > Brake/EPB > Clear DTCs

(1) Reconfirm the DTCs based on the recorded DTCs and freeze frame data.

Chassis > Brake/EPB > Trouble Codes

(2) Try to reproduce the problem symptoms based on the recorded DTCs and freeze frame data, and then check if the DTCs are output again.

Result	Proceed to
DTCs are not output (Problem symptom occurs.)	A
DTCs are output	B
DTCs are not output (Problem symptom does not occur.)	C

HINT:

Refer to Diagnostic Trouble Code Chart if any DTCs are output.
When DTCs indicating a CAN communication system malfunction are output, first troubleshoot and repair the CAN communication system.

GO TO DIAGNOSTIC TROUBLE CODE CHART

USE SIMULATION METHOD TO CHECK

5.	PROBLEM SYMPTOMS TABLE

(a) Proceed to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO STEP 7

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Refer to Terminals of ECU.

Click here

(b) Refer to Data List / Active Test.

Click here

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Symptom	Suspected Area	Link
Electric parking brake does not operate	Proceed to "Electric Parking Brake does not Operate"
Parking brake indicator light does not illuminate or turn off when parking brake is manually engaged and disengaged	Proceed to "Electric Parking Brake does not Operate"
Electric parking brake AUTO function (shift-linked function) does not operate (shift-linked parking brake does not lock or release)	Proceed to "Electric Parking Brake AUTO Function Circuit"
Message not displayed on multi-information display when AUTO function set to ON/OFF	Proceed to "Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF"
Brake system warning light (Yellow indicator) remains on	Proceed to "Brake Warning Light (Yellow) Remains On"

Terminals Of Ecu

TERMINALS OF ECU

CHECK NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Front view of wire harness connector

(to No. 2 Skid Control ECU (brake actuator assembly))

(a) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connectors.

(b) Measure the voltage and resistance according to the value (s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A4-14 ( BS) - Body ground	Parking brake motor (parking brake actuator assembly) power supply	Always	11 to 14 V
A4-45 (IG1) - Body ground	IG power supply	Ignition switch ON	11 to 14 V
A4-1 (GND1) - Body ground	Ground	Always	Below 1 Ω
A4-13 (MRR )	Parking brake motor RH (parking brake actuator assembly RH) ( )	-	-
A4-12 (MRR-)	Parking brake motor RH (parking brake actuator assembly RH) (-)	-	-
A4-3 (MRL )	Parking brake motor LH (parking brake actuator assembly LH) ( )	-	-
A4-2 (MRL-)	Parking brake motor LH (parking brake actuator assembly LH) (-)	-	-
A4-36 (SWI1)	Electric parking brake switch (electric parking brake switch assembly)	-	-
A4-31 (SWO1)	Electric parking brake switch (electric parking brake switch assembly)	-	-
A4-41 (SWI2)	Electric parking brake switch (electric parking brake switch assembly)	-	-
A4-39 (SWO2)	Electric parking brake switch (electric parking brake switch assembly)	-	-
A4-27 (CANH)	CAN communication line (H)	-	-
A4-43 (CANL)	CAN communication line (L)	-	-
A4-16 (CA2H)	CAN communication line 2 (H)	-	-
A4-17 (CA2L)	CAN communication line 2 (L)	-	-

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK DTC AND FREEZE FRAME DATA

(a) Turn the ignition switch off.

(b) Connect the GTS to the DLC3.

(d) Turn the GTS on.

(e) Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(f) Check for DTCs.

Click here

NOTICE:

The electric parking brake system outputs DTCs for the following system. When DTCs other than those in Diagnostic Trouble Code Chart for the electric parking brake system are output, refer to Diagnostic Trouble Code Chart for the relevant system.

System	Proceed to
Electronically Controlled Brake System

(g) Check the freeze frame data.

(1) If DTCs are output, check the freeze frame data and read the Toyota Prius vehicle status when the DTC was stored.

HINT:

for Freeze Frame Data: Click here

(h) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

HINT:

When DTCs are cleared, the freeze frame data will also be cleared.

Freeze Frame Data

FREEZE FRAME DATA

FREEZE FRAME DATA

HINT:

When a DTC is stored, the freeze frame data stores the current vehicle (sensor) state as.
The freeze frame data cannot be cleared or updated until the recorded DTCs are cleared.

(a) Using the GTS, the state of the Toyota Prius vehicle (sensors) when the system is operating or when a DTC was stored can be checked.

Chassis > Brake/EPB

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Wheel Speed	Front wheel speed sensor RH reading	Min.: 0.0 km/h (0.0 mph) Max.: 6553.5 km/h (4072 mph)	Toyota Prius Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations
FL Wheel Speed	Front wheel speed sensor LH reading	Min.: 0.0 km/h (0.0 mph) Max.: 6553.5 km/h (4072 mph)	Toyota Prius Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations
RR Wheel Speed	Rear wheel speed sensor RH reading	Min.: 0.0 km/h (0.0 mph) Max.: 6553.5 km/h (4072 mph)	Toyota Prius Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations
RL Wheel Speed	Rear wheel speed sensor LH reading	Min.: 0.0 km/h (0.0 mph) Max.: 6553.5 km/h (4072 mph)	Toyota Prius Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations
Forward and Rearward G	Forward and rearward G	Min.: -25.105 m/s2 Max.: 24.908 m/s2	During deceleration: -25.105 to 0.000 m/s2 During acceleration: 0.000 to 24.908 m/s2	During acceleration/deceleration: Changes in proportion with acceleration
Accelerator Opening Angle %	Percentage of accelerator pedal opening angle	Min.: 0.0% Max.: 127.5%	Accelerator pedal released: 0.0%	During accelerator pedal operation: Changes in proportion with the pedal movement
Power Train Driving force	Powertrain output torque	Min.: -327680 N Max.: 327670 N	-	-
Gear Position	Gear position information	fail / 1st / 2nd / 3rd / 4th / 5th / 6th / 7th / 8th / 9th / 10th / P/N / R	Actual gear position	-
Shift Lever Position	Shift lever position information	fail / 1st / 2nd / 3rd / 4th / 5th / 6th / B / D/M / N / P / R / No input	Actual shift lever position	-
Brake Hold Control Mode	Brake hold control mode	Out of control mode / Pressure hold mode / Pressure release mode / EPB lock mode	Out of control mode: Brake hold control system is off or brake hold control system is stand-by mode (brake hold standby indicator light is illuminated) Pressure hold mode: Brake hold control is operating (brake hold operated indicator light is illuminated) Pressure release mode: Brake hold control is released (brake hold operated indicator light not illuminated) EPB lock mode: Parking brake is engaged during brake hold control	HINT: EPB: Electric Parking Brake System If the brake pedal is not depressed for 3 minutes or more after entering pressure hold mode, the system automatically changes to EPB lock mode
Toyota Prius Vehicle Speed	Vehicle speed (estimated vehicle speed used for various controls)	Min.: 0.0 km/h (0 mph) Max.: 6553.5 km/h (4072 mph)	Vehicle stopped: 0.0 km/h (0 mph)	When driving at constant speed: No large fluctuations
Toyota Prius Vehicle Speed Grade	Vehicle acceleration/deceleration	Min.: -25.105 m/s2 Max.: 24.908 m/s2	Vehicle stopped: 0.000 m/s2 During deceleration: -25.105 to 0.000 m/s2 During acceleration: 0.000 to 24.908 m/s2	During driving: Changes in proportion with Toyota Prius vehicle acceleration/deceleration
Parking Brake SW	Parking brake status	OFF / ON	OFF: Parking brake released ON: Parking brake applied	-
Deceleration Open	Acceleration sensor open detection	Normal / Under intermittent	Normal: Momentary interruption not detected Under intermittent: Momentary interruption detected	-
A/C ECU Communication Open	Air conditioning amplifier assembly communication open detection	Normal / Under intermittent	Normal: Momentary interruption not detected Under intermittent: Momentary interruption detected	-
HV Communication Open	Hybrid Toyota Prius vehicle control ECU communication open detection	Normal / Under intermittent	Normal: Momentary interruption not detected Under intermittent: Momentary interruption detected	-
ECU B1 Voltage	No. 2 skid control ECU (brake actuator assembly) B1 voltage	Min.: 0.0 V Max.: 25.5 V	11.0 to 14.0 V	-
RH Actuator Motor Input Voltage	Parking brake motor RH (parking brake actuator assembly RH) input voltage	Min.: 0.0 V Max.: 25.5 V	-	-
LH Actuator Motor Input Voltage	Parking brake motor LH (parking brake actuator assembly LH) input voltage	Min.: 0.0 V Max.: 25.5 V	-	-
RH Actuator Motor Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) positive ( ) terminal side voltage	Min.: 0.0 V Max.: 25.5 V	-	-
LH Actuator Motor Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) positive ( ) terminal side voltage	Min.: 0.0 V Max.: 25.5 V	-	-
RH Actuator Motor -Terminal Voltage	Parking brake motor RH (parking brake actuator assembly RH) negative (-) terminal side voltage	Min.: 0.0 V Max.: 25.5 V	-	-
LH Actuator Motor -Terminal Voltage	Parking brake motor LH (parking brake actuator assembly LH) negative (-) terminal side voltage	Min.: 0.0 V Max.: 25.5 V	-	-
EPB Switch	Electric parking brake switch (electric parking brake switch assembly) input	Neutral / Apply / Release / Unknown	Neutral: Lock switch and release switch are off Apply: Lock switch on Release: Release switch on	When not normal, electric parking brake switch (electric parking brake switch assembly) release side system may be malfunctioning HINT: EPB stands for electric parking brake.
RH Actuator Motor Actual Current	Parking brake motor RH (parking brake actuator assembly RH) current value	Min.: -5.0362 A Max.: 50.5004 A	-	-
LH Actuator Motor Actual Current	Parking brake motor LH (parking brake actuator assembly LH) current value	Min.: -5.0362 A Max.: 50.5004 A	-	-
RH Actuator Motor Adjustment Current	Parking brake motor RH (parking brake actuator assembly RH) current calibration value	Min.: -6.9693 A Max.: 6.9148 A	-	-
LH Actuator Motor Adjustment Current	Parking brake motor LH (parking brake actuator assembly LH) current calibration value	Min.: -6.9693 A Max.: 6.9148 A	-	-
RH Actuator Motor Current Differential	Differences in parking brake motor RH (parking brake actuator assembly RH) monitoring current	Min.: -1.008 A Max.: 0.945 A	-	-
LH Actuator Motor Current Differential	Differences in parking brake motor LH (parking brake actuator assembly LH) monitoring current	Min.: -1.008 A Max.: 0.945 A	-	-
Toyota Prius Vehicle Speed (Control Value)	Vehicle speed (control value)	Min.: 0.0 km/h (0 mph) Max.: 6553.5 km/h (4072 mph)	-	-
Counter of IG ON After EPB Control Cancel	Number of times the ignition switch was turned to ON after EPB control was canceled	Min.: 0 Times Max.: 255 Times	-	HINT: EPB stands for electric parking brake.
RH Actuator Status	Parking brake actuator assembly RH condition	Park Applied / Hold Applied / Released / Applying / Releasing / Completely Released / Unknown	-	-
LH Actuator Status	Parking brake actuator assembly LH condition	Park Applied / Hold Applied / Released / Applying / Releasing / Completely Released / Unknown	-	-
EPB Warning Light	Brake system warning light (yellow indicator) output signal	OFF / ON	OFF: Brake system warning light (yellow indicator) turns off ON: Brake system warning light (yellow indicator) illuminates	HINT: EPB stands for electric parking brake.
Auto Mode Request	Auto mode request status	Manual mode request / Auto mode request	-	-
Brake Hold Ready	Brake hold control permission status	Not in stand-by mode / Stand-by mode	Not in stand-by mode: Brake hold function not operating (brake hold standby indicator light not illuminated) Stand-by mode: Brake hold function stand-by state (brake hold standby indicator light illuminated)	-
EPB Lock Request	Lock demand status	Not requested / requested	-	HINT: EPB stands for electric parking brake.
Auto Mode	AUTO (shift-linked) mode permission status	OFF / ON	OFF: Manual mode ON: AUTO (shift-linked) mode	-
Dynamic PKB Mode	Dynamic parking brake operation status	OFF / ON	OFF: Dynamic parking brake is not operating ON: Dynamic parking brake is operating	-
RH Actuator Motor Relay1	Parking brake motor relay 1 RH condition	OFF / ON	-	-
RH Actuator Motor Relay2	Parking brake motor relay 2 RH condition	OFF / ON	-	-
RH Actuator Motor Relay3	Parking brake motor relay 3 RH condition	OFF / ON	-	-
RH Actuator Motor Relay4	Parking brake motor relay 4 RH condition	OFF / ON	-	-
LH Actuator Motor Relay1	Parking brake motor relay 1 LH condition	OFF / ON	-	-
LH Actuator Motor Relay2	Parking brake motor relay 2 LH condition	OFF / ON	-	-
LH Actuator Motor Relay3	Parking brake motor relay 3 LH condition	OFF / ON	-	-
LH Actuator Motor Relay4	Parking brake motor relay 4 LH condition	OFF / ON	-	-
FR Speed Signal Status	Front wheel RH speed signal status	Normal / Fixed	Normal: Wheel speed signal not stuck Fixed: Wheel speed signal stuck	-
FL Speed Signal Status	Front wheel LH speed signal status	Normal / Fixed	Normal: Wheel speed signal not stuck Fixed: Wheel speed signal stuck	-
RR Speed Signal Status	Rear wheel RH speed signal status	Normal / Fixed	Normal: Wheel speed signal not stuck Fixed: Wheel speed signal stuck	-
RL Speed Signal Status	Rear wheel LH speed signal status	Normal / Fixed	Normal: Wheel speed signal not stuck Fixed: Wheel speed signal stuck	-
RH Actuator Current Status	Parking brake actuator assembly RH monitoring current condition	Normal / Invalid	Normal	-
LH Actuator Current Status	Parking brake actuator assembly LH monitoring current condition	Normal / Invalid	Normal	-
Permission of Interlocking Shift	AUTO (shift-linked) mode permission status	Available / Not available	-	-
Permission of Interlocking Brake	Brake-linked permission status	Available / Not available	-	-
Permission of RH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	Available / Not available	-	-
Permission of RH Interlocking PKB Release	Parking brake actuator assembly RH parking brake release control permission status	Available / Not available	-	-
Permission of RH Interlocking Dynamic PKB	Parking brake actuator assembly RH dynamic parking control permission status	Available / Not available	-	-
Permission of RH Interlocking PKB Full Release	Parking brake actuator assembly RH parking brake full release permission status	Available / Not available	-	-
Permission of LH Interlocking PKB Lock	Parking brake actuator assembly LH parking brake lock control permission status	Available / Not available	-	-
Permission of LH Interlocking PKB Release	Parking brake actuator assembly LH parking brake release control permission status	Available / Not available	-	-
Permission of LH Interlocking Dynamic PKB	Parking brake actuator assembly LH dynamic parking control permission status	Available / Not available	-	-
Permission of LH Interlocking PKB Full Release	Parking brake actuator assembly LH parking brake full release permission status	Available / Not available	-	-
Fade Status	Fade status	OFF / ON	-	-
RH Actuator Motor Current High	Parking brake motor RH (parking brake actuator assembly RH) overcurrent status	OFF / ON	-	-
RH Actuator Motor Driver Operation Status	Parking brake motor RH (parking brake actuator assembly RH) driver status	OFF / ON	-	-
LH Actuator Motor Current High	Parking brake motor LH (parking brake actuator assembly LH) overcurrent status	OFF / ON	-	-
LH Actuator Motor Driver Operation Status	Parking brake motor LH (parking brake actuator assembly LH) driver status	OFF / ON	-	-
IGR Voltage	IG1 voltage value	Min.: 0.0 V Max.: 25.5 V	-	Changes in proportion to auxiliary battery voltage
BS Voltage	BS voltage value	Min.: 0.0 V Max.: 25.5 V	-	Changes in proportion to auxiliary battery voltage

Inspection

INSPECTION

PROCEDURE

1. INSPECT PARKING BRAKE ACTUATOR ASSEMBLY

(a) Parking brake actuator assembly operation inspection

(1) Apply voltage to the terminals of the parking brake actuator assembly and check that it operates as specified.

OK:

Connection

Parking Brake Actuator Assembly Operation

2 ( ) - Auxiliary battery positive ( )

1 (-) - Auxiliary battery negative (-)

Lock

1 (-) - Auxiliary battery positive ( )

2 ( ) - Auxiliary battery negative (-)

Release

If the result is not as specified, replace the parking brake actuator assembly.

Component without harness connected

(Parking Brake Actuator Assembly)

Lock

Release

2. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Check the resistance.

(1) Measure the resistance according to the value(s) in the table below.

Component without harness connected (Electric Parking Brake Switch Assembly)

Standard Resistance:

Click Location & Routing(K22) Click Connector(K22)

Tester Connection	Condition	Specified Condition	Result
K22-8 (SWI1) - K22-9 (SWO1)	OFF (Release)	100 kΩ or higher	kΩ
K22-8 (SWI1) - K22-9 (SWO1)	ON (Lock)	10 Ω or less	Ω
K22-8 (SWI1) - K22-9 (SWO1)	Switch not operated	100 kΩ or higher	kΩ
K22-8 (SWI1) - K22-1 (SWI2)	OFF (Release)	10 Ω or less	Ω
K22-8 (SWI1) - K22-1 (SWI2)	ON (Lock)	10 Ω or less	Ω
K22-8 (SWI1) - K22-1 (SWI2)	Switch not operated	100 kΩ or higher	kΩ
K22-8 (SWI1) - K22-2 (SWO2)	OFF (Release)	10 Ω or less	Ω
K22-8 (SWI1) - K22-2 (SWO2)	ON (Lock)	100 kΩ or higher	kΩ
K22-8 (SWI1) - K22-2 (SWO2)	Switch not operated	10 Ω or less	Ω
K22-1 (SWI2) - K22-9 (SWO1)	OFF (Release)	100 kΩ or higher	kΩ
K22-1 (SWI2) - K22-9 (SWO1)	ON (Lock)	10 Ω or less	Ω
K22-1 (SWI2) - K22-9 (SWO1)	Switch not operated	10 Ω or less	Ω
K22-1 (SWI2) - K22-2 (SWO2)	OFF (Release)	10 Ω or less	Ω
K22-1 (SWI2) - K22-2 (SWO2)	ON (Lock)	100 kΩ or higher	kΩ
K22-1 (SWI2) - K22-2 (SWO2)	Switch not operated	100 kΩ or higher	kΩ

If the result is not as specified, replace the electric parking brake switch assembly.

VEHICLE CONTROL HISTORY (RoB)

VEHICLE CONTROL HISTORY (RoB)

DESCRIPTION

Vehicle Control History (RoB) is a function that captures and stores ECU data when triggered by specific vehicle behavior.
If the customer states that the engine stalled or will not start, it may be possible to diagnose the cause of the malfunction by checking the Toyota Prius vehicle history information and Freeze Frame Data.
The number of possible stored Freeze Frame Data sets, whether multi Freeze Frame Data is available, the number of freeze frame points, Freeze Frame Data items, the ECU internal range, etc., is different depending on the stored group.
The stored data items for Toyota Prius Vehicle Control History (RoB) Freeze Frame Data are different depending on the stored group. When the value of a data item does not change across all points, only the value of the detection point will be displayed. The contents of the Freeze Frame Data is almost the same as that of the Data List.
Click here

PRECAUTIONS

As Toyota Prius Vehicle Control History (RoB) may be overwritten whenever the trigger conditions are met, make sure to save Vehicle Control History (RoB) before performing any inspections.
As Vehicle Control History (RoB) may be stored when performing an Active Test, learning, etc., make sure to clear the Vehicle Control History (RoB) before returning the Toyota Prius vehicle to the customer.

CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRIC PARKING BRAKE SYSTEM)

HINT:

Vehicle Control History (RoB) of the electric parking brake system can be confirmed using the same menu for the electronically controlled brake system: Chassis / Brake/EPB / Utility / Toyota Prius Vehicle Control History (RoB)
Click here

Brake System Control Module "A" System Internal Failure (C059704,C059746,C13CF1C,C13D41C)

DESCRIPTION

The following DTCs are stored when a malfunction occurs in the No. 2 skid control ECU (brake actuator assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C059704	Brake System Control Module "A" System Internal Failure	No. 2 skid control ECU (brake actuator assembly) internal malfunction	No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.
C059746	Brake System Control Module "A" Calibration / Parameter Memory Failure	No. 2 skid control ECU (brake actuator assembly) internal malfunction	No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.
C13CF1C	Left Electric Parking Brake Actuator Current Sensor Circuit Voltage Out of Range	No. 2 skid control ECU (brake actuator assembly) internal malfunction	No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.
C13D41C	Right Electric Parking Brake Actuator Current Sensor Circuit Voltage Out of Range	No. 2 skid control ECU (brake actuator assembly) internal malfunction	No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

PROCEDURE

1.	REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

(a) Replace the No. 2 skid control ECU (brake actuator assembly).

HINT:

Click here

END

Electric Parking Brake Switch Circuit Open (C060913)

DESCRIPTION

When the electric parking brake switch is pulled, a lock request signal is sent from the No. 2 skid control ECU (brake actuator assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the No. 2 skid control ECU (brake actuator assembly) to the parking brake actuator assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060913	Electric Parking Brake Switch Circuit Open	Open detected in parking brake switch circuit for 1 second or more	Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	B	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the electric parking brake switch is held near the lock position but not fully in the lock position for 1 second or more, a DTC may be stored due to one of the two contacts being ON while the other is OFF. (This is not a system malfunction.)

PROCEDURE

CHECK DTC

(a) Check for DTCs.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
Only C060913 is output	A
C060913 and C060962 are output	B

GO TO DTC C060962

2.	CHECK HARNESS AND CONNECTOR (NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

Procedure1

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

Pre-procedure1

(b) Disconnect the K22 electric parking brake switch (electric parking brake switch assembly) connector.

Procedure1

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A4,K22) Click Connector(A4) Click Connector(K22)

Tester Connection	Condition	Specified Condition	Result
A4-36 (SWI1) - K22-8 (SWI1)	Always	Below 1 Ω	Ω
A4-31 (SWO1) - K22-9 (SWO1)	Always	Below 1 Ω	Ω
A4-41 (SWI2) - K22-1 (SWI2)	Always	Below 1 Ω	Ω
A4-39 (SWO2) - K22-2 (SWO2)	Always	Below 1 Ω	Ω
A4-36 (SWI1) or K22-8 (SWI1) - Body ground	Always	10 kΩ or higher	kΩ
A4-31 (SWO1) or K22-9 (SWO1) - Body ground	Always	10 kΩ or higher	kΩ
A4-41 (SWI2) or K22-1 (SWI2) - Body ground	Always	10 kΩ or higher	kΩ
A4-39 (SWO2) or K22-2 (SWO2) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Electric Parking Brake Switch Signal Compare Failure (C060962)

DESCRIPTION

Refer to DTC C060913.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060962	Electric Parking Brake Switch Signal Compare Failure	Open or short detected in parking brake switch circuit for 1 second or more Stuck parking brake switch detected (when parked: 30 seconds, when driving: 1 second, during engine stall: 1 second) Stuck parking brake switch detected 3 times in succession when being operated	Electric parking brake switch (electric parking brake switch assembly) Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions: C060962

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3	Pattern 4	Pattern 5	Pattern 6
Diagnosis Condition	Toyota Prius Vehicle is stopped	-	-	○	-	-	-
	Toyota Prius Vehicle is being driven	-	-	-	○	-	-
	During initial check	-	-	-	-	○	-
	Parking brake switch is being operated	-	-	-	-	-	○
Malfunction Status	Open detected in parking brake switch circuit	○	-	-	-	-	-
	Short detected in parking brake switch circuit	-	○	-	-	-	-
	Stuck parking brake switch detected	-	-	○	○	○	○
Detection Time		1 second or more	1 second or more	30 seconds or more	1 second or more	1 second or more	-
Number of Trips		1 trip	1 trip	1 trip	1 trip	1 trip	3 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

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CAUTION / NOTICE / HINT

NOTICE:

PROCEDURE

1.	READ VALUE USING GTS (EPB SWITCH)

Pre-procedure1

(a) Connect the GTS to the DLC3.

Pre-procedure2

(b) Turn the ignition switch to ON.

Pre-procedure3

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

EPB Switch

Electric parking brake switch (electric parking brake switch assembly) input

Neutral / Apply / Release / Unknown

Neutral: Lock switch and release switch are off

Apply: Lock switch on

Release: Release switch on

When not normal, electric parking brake switch (electric parking brake switch assembly) release side system may be malfunctioning

HINT:

EPB stands for electric parking brake.

Chassis > Brake/EPB > Data List

Tester Display
EPB Switch

Procedure1

(d) Operate the electric parking brake switch assembly and check that the value of "EPB Switch" in the Data List changes between Apply and Release in accordance with the operation of the switch.

OK:

The value of EPB Switch changes between Apply and Release in accordance with switch operation.

Post-procedure1

(e) None

GO TO STEP 4

CLEAR DTC

(a) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

CHECK DTC

(a) Check for DTCs.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

4.	INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

Click here

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

Pre-procedure1

(a) Disconnect the K22 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Procedure1

Standard Resistance:

Click Location & Routing(A4,K22) Click Connector(A4) Click Connector(K22)

Tester Connection	Condition	Specified Condition	Result
A4-36 (SWI1) - K22-8 (SWI1)	Always	Below 1 Ω	Ω
A4-31 (SWO1) - K22-9 (SWO1)	Always	Below 1 Ω	Ω
A4-41 (SWI2) - K22-1 (SWI2)	Always	Below 1 Ω	Ω
A4-39 (SWO2) - K22-2 (SWO2)	Always	Below 1 Ω	Ω
A4-36 (SWI1) or K22-8 (SWI1) - Body ground	Always	10 kΩ or higher	kΩ
A4-31 (SWO1) or K22-9 (SWO1) - Body ground	Always	10 kΩ or higher	kΩ
A4-41 (SWI2) or K22-1 (SWI2) - Body ground	Always	10 kΩ or higher	kΩ
A4-39 (SWO2) or K22-2 (SWO2) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) None

Procedure1

(b) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

Post-procedure1

CHECK DTC

(a) Check for DTCs.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
DTCs are output	A
DTCs are not output	B

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

USE SIMULATION METHOD TO CHECK

Left Electric Parking Brake Actuator Control Circuit Short to Ground (C060B11)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060B11	Left Electric Parking Brake Actuator Control Circuit Short to Ground	Diagnosis Condition: Electric parking brake not operating Malfunction Status: The ECU power supply is normal but there is a malfunction in the electric parking brake actuator LH internal circuit (short to GND). Detection Time: Approximately 1 second	Parking brake actuator assembly LH No. 2 parking brake wire assembly Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

PROCEDURE

1.	INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY

Pre-procedure1

(a) Turn the ignition switch off.

Procedure1

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

Pre-procedure2

Procedure2

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

Procedure3

(e) Measure the resistance according to the value(s) in the table below.

*a	Front view of No. 2 Parking Brake Wire Assembly	*b	to wire harness connector
*c	to Parking Brake Actuator Assembly LH	-	-

Standard Resistance:

Click Location & Routing(rR3,r3) Click Connector(rR3) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
rR3-1 or r3-2 ( ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
rR3-2 or r3-1 (-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(f) None

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY LH)

Pre-procedure1

(a) Turn the ignition switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

(d) Disconnect the r3 parking brake actuator assembly LH connector.

Procedure1

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A4,r3) Click Connector(A4) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
A4-3 (MRL ) or r3-2 ( ) - Body ground	Always	10 kΩ or higher	kΩ
A4-2 (MRL-) or r3-1 (-) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(f) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT PARKING BRAKE ACTUATOR ASSEMBLY LH

Click here

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

Left Electric Parking Brake Actuator Control Circuit Short to Battery (C060B12)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060B12	Left Electric Parking Brake Actuator Control Circuit Short to Battery	Diagnosis Condition: Electric parking brake not operating Malfunction Status: The ECU power supply is normal but there is a malfunction in the electric parking brake actuator LH internal circuit (short to B). Detection Time: Approximately 1 second	Parking brake actuator assembly LH No. 2 parking brake wire assembly Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

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PROCEDURE

1.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Turn the ignition switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

Procedure1

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(r3) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
r3-2 ( ) - r3-1 (-)	Electric parking brake not operating	Below 1 V	V

Post-procedure1

(e) None

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

2.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Disconnect the rR3 No. 2 parking brake wire assembly connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(rR3) Click Connector(rR3)

Tester Connection	Condition	Specified Condition	Result
rR3-1 - rR3-2	Electric parking brake not operating	Below 1 V	V

Result:

Proceed to
OK
NG

*a	Front view of wire harness connector (to No. 2 Parking Brake Wire Assembly)

Post-procedure1

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

3.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Disconnect the rR3 No. 2 parking brake wire assembly connector.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Procedure1

*a	Front view of wire harness connector	*b	to No. 2 Skid Control ECU (Brake Actuator Assembly)
*c	to No. 2 Parking Brake Wire Assembly	-	-

Standard Voltage:

Click Location & Routing(rR3,A4) Click Connector(rR3) Click Connector(A4)

Tester Connection	Condition	Specified Condition	Result
rR3-1 or A4-3 (MRL ) - Body ground	Always	Below 1 V	V
rR3-2 or A4-2 (MRL-) - Body ground	Always	Below 1 V	V

Post-procedure1

(d) None

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Left Electric Parking Brake Actuator Circuit Current Above Threshold (C060E19)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060E19	Left Electric Parking Brake Actuator Circuit Current Above Threshold	When the electric parking brake is operating, overcurrent is detected in the parking brake actuator assembly LH 3 times.	Parking brake actuator assembly LH No. 2 parking brake wire assembly Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

Click here

PROCEDURE

1.	INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY

Procedure1

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

Pre-procedure1

(b) Disconnect the rR3 and r3 No. 2 parking brake wire assembly connectors.

Procedure2

OK:

No deformation or corrosion.

Procedure3

(d) Measure the resistance according to the value(s) in the table below.

*a	Front view of No. 2 Parking Brake Wire Assembly	*b	to wire harness connector
*c	to Parking Brake Actuator Assembly LH	-	-

Standard Resistance:

Click Location & Routing(rR3,r3) Click Connector(rR3) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
rR3-1 - r3-2 ( )	Always	Below 1 Ω	Ω
rR3-1 or r3-2 ( ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
rR3-2 - r3-1 (-)	Always	Below 1 Ω	Ω
rR3-2 or r3-1 (-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY LH)

Pre-procedure1

(a) Make sure the No. 2 parking brake wire assembly is securely installed.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Procedure1

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A4,r3) Click Connector(A4) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
A4-3 (MRL ) - r3-2 ( )	Always	Below 1 Ω	Ω
A4-3 (MRL ) or r3-2 ( ) - Body ground	Always	10 kΩ or higher	kΩ
A4-2 (MRL-) - r3-1 (-)	Always	Below 1 Ω	Ω
A4-2 (MRL-) or r3-1 (-) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(e) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT PARKING BRAKE ACTUATOR ASSEMBLY LH

Click here

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

4.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Turn the ignition switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

Procedure1

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(r3) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
r3-2 ( ) - r3-1 (-)	Electric parking brake not operating	Below 1 V	V

Post-procedure1

(e) None

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

5.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Disconnect the rR3 No. 2 parking brake wire assembly connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(rR3) Click Connector(rR3)

Tester Connection	Condition	Specified Condition	Result
rR3-1 - rR3-2	Electric parking brake not operating	Below 1 V	V

Result:

Proceed to
OK
NG

*a	Front view of wire harness connector (to No. 2 Parking Brake Wire Assembly)

Post-procedure1

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

6.	CHECK FOR SHORT TO B

Pre-procedure1

(a) Disconnect the rR3 No. 2 parking brake wire assembly connector.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Procedure1

*a	Front view of wire harness connector	*b	to No. 2 Skid Control ECU (Brake Actuator Assembly)
*c	to No. 2 Parking Brake Wire Assembly	-	-

Standard Voltage:

Click Location & Routing(rR3,A4) Click Connector(rR3) Click Connector(A4)

Tester Connection	Condition	Specified Condition	Result
rR3-1 or A4-3 (MRL ) - Body ground	Always	Below 1 V	V
rR3-2 or A4-2 (MRL-) - Body ground	Always	Below 1 V	V

Post-procedure1

(d) None

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Left Electric Parking Brake Actuator Signal Stuck In Range (C060E2A)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C060E2A	Left Electric Parking Brake Actuator Signal Stuck In Range	Diagnosis Condition: Electric parking brake operating Malfunction Status: Motor locked, gear locked, free spinning Detection Time: -	Parking brake actuator assembly LH No. 2 parking brake wire assembly Wire harness and connector Rear brake LH	DTC stored	Brake/EPB	B	An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Electric parking brake operating	○	○	○
Malfunction Status	Motor lock detected	○	-	-
	Gear lock detected	-	○	-
	Free spinning detected	-	-	○
Detection Time		-	-	-
Number of Trips		1 trip	1 trip	1 trip

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

Although DTC C060E2A may be stored after entering pad replacement mode, this is not a malfunction.
Although DTC C060E2A may be stored after forcibly releasing the parking brake, this is not a malfunction.

PROCEDURE

CHECK DTC

(a) Using the GTS, check for DTCs other than DTC C060E2A.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
Only C060E2A is output	A
C060E2A and other DTCs are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY

Pre-procedure1

(a) Turn the ignition switch off.

Procedure1

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

Pre-procedure2

Procedure2

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

Procedure3

(e) Measure the resistance according to the value(s) in the table below.

*a	Front view of No. 2 Parking Brake Wire Assembly	*b	to wire harness connector
*c	to Parking Brake Actuator Assembly LH	-	-

Standard Resistance:

Click Location & Routing(rR3,r3) Click Connector(rR3) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
rR3-1 - r3-2 ( )	Always	Below 1 Ω	Ω
rR3-1 or r3-2 ( ) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
rR3-2 - r3-1 (-)	Always	Below 1 Ω	Ω
rR3-2 or r3-1 (-) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(f) None

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY LH)

Pre-procedure1

(a) Turn the ignition switch off.

(b) Make sure the No. 2 parking brake wire assembly is securely installed.

(d) Disconnect the r3 parking brake actuator assembly LH connector.

Procedure1

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Click Location & Routing(A4,r3) Click Connector(A4) Click Connector(r3)

Tester Connection	Condition	Specified Condition	Result
A4-3 (MRL ) - r3-2 ( )	Always	Below 1 Ω	Ω
A4-2 (MRL-) - r3-1 (-)	Always	Below 1 Ω	Ω
A4-3 (MRL ) or r3-2 ( ) - Body ground	Always	10 kΩ or higher	kΩ
A4-2 (MRL-) or r3-1 (-) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(f) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT REAR BRAKE AND PARKING BRAKE ACTUATOR ASSEMBLY LH (CHECK FOR ROTATING PARTS THAT ARE STUCK AND FOR FREE SPINNING ACTUATORS)

Pre-procedure1

(a) Enter rear brake pad replacement mode.

HINT:

Click here

(b) Turn the ignition switch off.

Procedure1

(1) Check that the parking brake actuator assembly LH is installed properly to the rear brake caliper and that it is not spinning freely.

HINT:

For the parking brake actuator assembly LH removal procedure: Click here

(2) Check that there is no damage to the rotating parts from the parking brake actuator assembly LH to the rear brake caliper.

(3) Inspect the parking brake actuator assembly LH and check that it operates correctly.

HINT:

Click here

(4) Check that the rear brake caliper threaded part rotates and that the rear disc brake piston moves outward.

HINT:

For the check procedures, refer to the parking brake forced release method when not using the GTS.

Click here

Result	Proceed to
Parking brake actuator assembly LH is malfunctioning	A
Other than parking brake actuator assembly LH is malfunctioning	B

Post-procedure1

(d) Return to normal mode after work is complete.

HINT:

Click here

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY LH

REPAIR OR REPLACE ABNORMAL PARTS

Ignition Switch On/Start Position Circuit Short to Ground or Open (C102014)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C102014	Ignition Switch On/Start Position Circuit Short to Ground or Open	Diagnosis Condition: Ignition switch ON Malfunction Status: When the ECM is communicating via CAN communication, IG power is not input to the No. 2 skid control ECU (brake actuator sub-assembly). Detection Time: Approximately 15 seconds	Wire harness and connector No. 2 skid control ECU (brake actuator assembly)	DTC stored	Brake/EPB	A	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (IG TERMINAL VOLTAGE)

Pre-procedure1

(a) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

(b) Turn the ignition switch to ON.

Procedure1

Standard Voltage:

Click Location & Routing(A4) Click Connector(A4)

Tester Connection	Condition	Specified Condition
A4-45 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Post-procedure1

(d) None

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Electric Parking Brake Actuator Supply Voltage Circuit Voltage Below Threshold (C13B516)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

Priority

Note

C13B516

Electric Parking Brake Actuator Supply Voltage Circuit Voltage Below Threshold

Diagnosis Condition:
Ignition switch ON or electric parking brake switch assembly pulled to lock side with ignition switch off.
Malfunction Status:
Voltage at terminal BS is less than 6 V*
Detection Time:
Approximately 0.5 seconds

HINT:

*: When the auxiliary battery voltage is 12 V.

Wire harness and connector
No. 2 skid control ECU (brake actuator assembly)

DTC stored

Brake/EPB

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions: C13B516

		Toyota Prius Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	-
Diagnosis Condition	Electric parking brake switch assembly pulled to lock side with ignition switch off	-	○
Malfunction Status	Voltage at terminal BS is less than 6 V* HINT: *: When the auxiliary battery voltage is 12 V.	○	○
Detection Time		Approximately 0.5 seconds	Approximately 0.5 seconds
Number of Trips		1 trip	1 trip

HINT:

DTC will be stored when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR ( BS TERMINAL VOLTAGE)

Pre-procedure1

(a) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Procedure1

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Click Location & Routing(A4) Click Connector(A4)

Tester Connection	Condition	Specified Condition	Result
A4-14 ( BS) - Body ground	Ignition switch off	11 to 14 V	V

Post-procedure1

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Electric Parking Brake Actuator (C13B800)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority	Note
C13B800	Electric Parking Brake Actuator	Diagnosis Condition: Electric parking brake operating Malfunction Status: Repeated slipping is detected Detection Time: -	Parking brake actuator assembly Rear brake	DTC stored	Brake/EPB	B	An electric parking brake system malfunction is displayed on the multi-information display.

CAUTION / NOTICE / HINT

NOTICE:

Although DTC C13B800 may be stored after entering pad replacement mode, this is not a malfunction.
Although DTC C13B800 may be stored after forcibly releasing the parking brake, this is not a malfunction.

PROCEDURE

CHECK DTC

(a) Using the GTS, check for DTCs other than DTC C13B800.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
Only C13B800 is output	A
C13B800 and other DTCs are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	ELECTRIC PARKING BRAKE OPERATION CHECK

(a) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.

Click here

REPAIR OR REPLACE ABNORMAL WHEELS

Electric Parking Brake does not Operate

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Even if the electric parking brake is operating normally, the parking brake indicator light on the combination meter may be malfunctioning.

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	Toyota Prius Vehicle OPERATION CHECK

(a) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.

Click here

Result	Proceed to
Lock and release operation is normal and parking brake indicator light turns off or blinks	A
Lock and release operation is malfunctioning and parking brake indicator light illuminates or turns off according to switch operation	B
Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks	C

INSPECT REAR BRAKE

GO TO STEP 4

3.	INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly using the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display
Park Warning

(b) Check the combination meter assembly.

OK:

Parking brake indicator light turns on or off in accordance with GTS operation.

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

GO TO METER / GAUGE SYSTEM

4.	CHECK HARNESS AND CONNECTOR ( BS TERMINAL VOLTAGE)

(a) Turn the ignition switch off.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Standard Voltage:

Click Location & Routing(A4) Click Connector(A4)

Tester Connection	Condition	Specified Condition
A4-14 ( BS) - Body ground	Ignition switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (IG1 TERMINAL VOLTAGE)

(a) Turn the ignition switch off.

(b) Disconnect the A4 No. 2 skid control ECU (brake actuator assembly) connector.

Standard Voltage:

Click Location & Routing(A4) Click Connector(A4)

Tester Connection	Condition	Specified Condition
A4-45 (IG1) - Body ground	Ignition switch ON	11 to 14 V

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Message Not Displayed on Multi-information Display When AUTO Function Set to ON/OFF

DESCRIPTION

When the AUTO function is set to ON/OFF, a message is displayed on the multi-information display in the combination meter assembly.

WIRING DIAGRAM

PROCEDURE

1.	CHECK OPERATION OF AUTO FUNCTION

(a) Check that the AUTO function operates when the operating conditions are met.

HINT:

Do not use the multi-information display to determine whether the AUTO function is operating or not.

Result	Proceed to
The AUTO function operates	A
The AUTO function does not operate	B

REPLACE COMBINATION METER ASSEMBLY

GO TO Electric Parking Brake System AUTO Function Circuit

Brake Warning Light (Yellow) Remains On

DESCRIPTION

This procedure is for troubleshooting when the brake system warning light (yellow indicator) remains on but no DTCs are output.

The No. 2 skid control ECU (brake actuator assembly) controls the brake system warning light (yellow indicator) in the combination meter assembly via CAN communication.

PROCEDURE

1.	CHECK Toyota Prius Vehicle CONTROL HISTORY (RoB) (ELECTRIC PARKING BRAKE SYSTEM)

(a) Using the GTS, check for Vehicle Control History (RoB).

Chassis > Brake/EPB > Utility

Tester Display
Toyota Prius Vehicle Control History (RoB)

HINT:

If vehicle control history (RoB) is stored when the electric parking brake system is suspended, the brake system warning light (yellow indicator) illuminates.

Result	Proceed to
There is no Toyota Prius vehicle control history (RoB) for when the electric parking brake system was suspended.	A
There is vehicle control history (RoB) for when the electric parking brake system was suspended.	B

PERFORM TROUBLESHOOTING AND REPAIR REGARDING Toyota Prius Vehicle CONTROL HISTORY

NOTICE:

After performing troubleshooting and repair regarding vehicle control history, clear the vehicle control history.

2.	INSPECT COMBINATION METER ASSEMBLY (BRAKE SYSTEM WARNING LIGHT (YELLOW INDICATOR))

(a) Perform the Active Test of the combination meter assembly using the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display
ECB Warning

(b) Check the combination meter assembly.

OK:

The brake system warning light (yellow indicator) turns on or off in accordance with GTS operation.

REPLACE NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

INSPECT METER / GAUGE SYSTEM

Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The No. 2 skid control ECU (brake actuator assembly) receives shift position signals from the hybrid vehicle control ECU via CAN communication to control the electric parking brake system AUTO function (shift-linked function).

The electric parking brake system AUTO function (shift-linked function) is automatically disabled when the ignition switch is ON, the brake pedal is depressed and the shift lever is moved out of P. Then, if the shift lever is moved to P, the AUTO function (shift-linked function) automatically operates to apply the electric parking brake.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The AUTO function (shift-linked function) will not be automatically disabled when the ignition switch is ON, the brake pedal is depressed and the shift lever is moved out from P if the electric parking brake switch assembly is moved to the engage side. The AUTO function (shift-linked function) will not automatically operate to apply the electric parking brake when the shift lever is moved to P if the electric parking brake switch assembly is moved to the release side.

PROCEDURE