Toyota Prius: Acoustic Vehicle Alerting System

• Precaution
• Parts Location
• System Diagram
• System Description
• How To Proceed With Troubleshooting
• Operation Check
• Problem Symptoms Table
• Terminals Of Ecu
• Data List / Active Test
• Diagnostic Trouble Code Chart
• Acoustic Vehicle Alerting Speaker Circuit Open (B135013,B135019)
• Lost Communication With Brake System Control Module Missing Message (U012987,U014087,U029387)
• Software Incompatibility with Body Control Module Invalid/Incompatible Software Component (U032257)
• There is No Sound Made

Precaution

PRECAUTION

PRECAUTIONS FOR DISCONNECTING AND RECONNECTING CABLE TO NEGATIVE (-) AUXILIARY BATTERY TERMINAL

PRECAUTIONS FOR ACOUSTIC Toyota Prius Vehicle ALERTING SYSTEM

(a) In the following cases, the volume or tone of the sound might change:

(1) If the vehicle is parked in a very hot or cold environment for an extended period of time (function will return to normal after time passes)

(2) If high pressure water is applied directly to the speaker from the bottom of the Toyota Prius vehicle

(3) If the front of the speaker is blocked by mud, snow, ice, etc.

(4) If the entire speaker freezes

(b) In the following cases, it may be difficult to hear the sound from the speaker:

(1) If the environment around the vehicle is very noisy (in a busy intersection or when an emergency Toyota Prius vehicle is approaching)

(2) If the listener is behind the vehicle. (Compared to a situation such as when a pedestrian is in front of the vehicle, the sound volume will seem to be lower when the car is reversing. This occurs because the speaker is installed facing the front of the vehicle.)

Parts Location

PARTS LOCATION

ILLUSTRATION

*1	Toyota Prius Vehicle APPROACHING SPEAKER ASSEMBLY	*2	NO. 2 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
*3	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - ECU-B FUSE	-	-

ILLUSTRATION

*1	Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER	*2	HYBRID VEHICLE CONTROL ECU
*3	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	*4	COMBINATION METER ASSEMBLY

System Diagram

SYSTEM DIAGRAM

System Description

SYSTEM DESCRIPTION

ACOUSTIC VEHICLE ALERTING SYSTEM

(a) When the vehicle is being driven quietly using the motor only, the acoustic vehicle alerting system outputs a warning sound from the vehicle approaching speaker assembly to inform pedestrians, cyclists etc., of the approach of the Toyota Prius vehicle.

(b) The warning sound is output by the vehicle approaching speaker assembly at a volume level that will not be perceived as noise. Also the pitch of the sound changes in accordance with vehicle speed so that the sound reflects vehicle deceleration and acceleration.

(c) Acoustic vehicle alerting system operation automatically stops when the shift lever is in P, the engine starts or the Toyota Prius vehicle is driven at 35 km/h (22 mph) or more.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	Toyota Prius Vehicle BROUGHT TO WORKSHOP

NEXT

2.	CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

NEXT

3.

PRE-CHECK

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

Standard Voltage:

11 to 14 V

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

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.	CHECK CAN COMMUNICATION SYSTEM*

(a) Using the GTS, check for CAN communication system DTCs.

for HEV Model: Click here

for PHEV Model: Click here

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

B

GO TO CAN COMMUNICATION SYSTEM for HEV Model: Click here for PHEV Model: Click here

A

5.	CHECK FOR DTC*

(a) Check for DTCs.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Trouble Codes

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

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

6.	PROBLEM SYMPTOMS TABLE

(a) Refer 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

B

GO TO PROBLEM SYMPTOMS TABLE

A

7.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check

Click here

(b) Data List / Active Test

Click here

(c) Terminals of ECU

Click here

(d) Inspection

NEXT

8.	REPAIR OR REPLACE

NEXT

9.	CONFIRMATION TEST

NEXT

END

Operation Check

OPERATION CHECK

ACOUSTIC VEHICLE ALERTING SYSTEM OPERATION CHECK

(a) System operation check (vehicle stopped)

NOTICE:

Perform this check with the AUTO function (shift-linked function) of the electric parking brake system off.

(1) Apply the parking brake.

(2) Turn the ignition switch to ON (READY).

(3) With the shift state in park (P), confirm that the acoustic Toyota Prius vehicle alerting system does not operate (does not produce a sound).

(4) When the shift state is changed from park (P) to neutral (N), check that the acoustic vehicle alerting system operates (produces a sound).

(b) System operation check (vehicle being driven)

(1) Turn the ignition switch to ON (READY).

(2) Operate the EV drive mode switch and drive the Toyota Prius vehicle using EV drive mode.

(3) When the shift state is changed from park (P) to drive (D), confirm that the acoustic vehicle alerting system operates (produces a sound) when the vehicle is driven at speeds of 35 km/h (22 mph) or less using EV drive mode.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

Acoustic Toyota Prius Vehicle Alerting System

Symptom	Suspected Area	Link
Sound is not produced	Refer to "There is No Sound Made"

Terminals Of Ecu

TERMINALS OF ECU

CHECK VEHICLE APPROACHING SPEAKER CONTROLLER

(a) Disconnect the A59 vehicle approaching speaker controller connector.

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

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A59-7 ( B) - Body ground	Power source	Ignition switch off	11 to 14 V
A59-12 (GND) - Body ground	Ground	Always	Below 1 Ω

(c) Connect the A59 Toyota Prius vehicle approaching speaker controller connector.

(d) Check the signal waveform and check for pulses according to the condition(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
A59-3 (SP ) - A59-4 (SP-)	Toyota Prius Vehicle approaching speaker assembly output	Vehicle approaching speaker assembly operating	A waveform synchronized with the sound is output. (See Waveform)
A59-1 (CANH) - A59-12 (GND)	CAN communication line	Ignition switch ON	Pulse generation
A59-2 (CANL) - A59-12 (GND)	CAN communication line	Ignition switch ON	Pulse generation

(1) Waveform

Item	Condition
Tester Connection	A59-3 (SP ) - A59-4 (SP-)
Tool Setting	1 V/DIV., 500 ms./DIV.
Condition	Toyota Prius Vehicle approaching speaker assembly operating

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(a) Read the Data List according to the display on the GTS.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Total Distance Traveled	Total distance traveled	Min.: 0 Max.: 16777215	-	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Total Distance Traveled - Unit	Unit for total distance traveled	-, km or mile	-	Although this item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Engine Mode	Engine condition	Stopped, Move to Stopping, Starting or Running	-	-
Shift Switch Status	Shift state	P Range, R Range, N Range, D Range or B Range	-	-
Estimated Toyota Prius Vehicle Speed	Estimated vehicle speed	0 to 655 km/h	-	-
Stop Light SW	Stop light switch signal	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	-
IGP	Status of IGR signal	OFF or ON	OFF: IGP off ON: IGP on	-
Ready Indicator	Ready indicator status	Light OFF, Blinking or Light ON	-	-
Door Lock Answerback Sound Setting	Status of door lock answerback sound setting	Normal Sound or Other Sound	-	The display varies depending on the Toyota Prius vehicle specifications.

ACTIVE TEST

HINT:

Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Proximity Sound (Toyota Prius Vehicle Stationary)	0 km/h (0 mph) vehicle proximity warning sound	OFF or ON	-
Proximity Sound (5km/h,3MPH)	5 km/h (3 mph) Toyota Prius vehicle proximity warning sound	OFF or ON	-
Proximity Sound (10km/h,6MPH)	10 km/h (6 mph) vehicle proximity warning sound	OFF or ON	-
Proximity Sound (15km/h,9MPH)	15 km/h (9 mph) Toyota Prius vehicle proximity warning sound	OFF or ON	-
Proximity Sound (20km/h,12MPH)	20 km/h (12 mph) vehicle proximity warning sound	OFF or ON	-
Proximity Sound (30km/h,18MPH)	30 km/h (18 mph) Toyota Prius vehicle proximity warning sound	OFF or ON	-
Proximity Sound (Reverse 6km/h,3.6MPH)	6 km/h (4 mph) reversing Toyota Prius vehicle proximity warning sound	OFF or ON	-

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Acoustic Vehicle Alerting System

DTC No.	Detection Item	DTC Output from	Priority	Link
B135013	Acoustic Toyota Prius Vehicle Alerting Speaker Circuit Open	Acoustic Vehicle Alerting System	A
B135019	Acoustic Toyota Prius Vehicle Alerting Speaker Circuit Current Above Threshold	Acoustic Vehicle Alerting System	A
U012987	Lost Communication With Brake System Control Module Missing Message	Acoustic Toyota Prius Vehicle Alerting System	B
U014087	Lost Communication with Body Control Module Missing Message	Acoustic Toyota Prius Vehicle Alerting System	B
U029387	Lost Communication with Hybrid/EV Powertrain Control Module Missing Message	Acoustic Toyota Prius Vehicle Alerting System	B
U032257	Software Incompatibility with Body Control Module Invalid/Incompatible Software Component	Acoustic Toyota Prius Vehicle Alerting System	A

Acoustic Vehicle Alerting Speaker Circuit Open (B135013,B135019)

DESCRIPTION

The vehicle approaching speaker assembly circuit consists of the vehicle approaching speaker controller and vehicle approaching speaker assembly.

This DTC is stored when a malfunction is detected in the vehicle approaching speaker assembly circuit or vehicle approaching speaker controller.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B135013	Acoustic Toyota Prius Vehicle Alerting Speaker Circuit Open	Detection condition: The ignition switch is ON. Power source voltage is 10 V or more. Malfunction status: When ECU output sound signal is being monitored with warning sound not being output, a speaker circuit open, short or short to ground is detected. Malfunction duration: 5 seconds or more	Toyota Prius Vehicle approaching speaker controller Vehicle approaching speaker assembly Harness or connector	Acoustic Vehicle Alerting System	A
B135019	Acoustic Toyota Prius Vehicle Alerting Speaker Circuit Current Above Threshold	Detection condition: The ignition switch is ON. Power source voltage is 9 V or more. Malfunction status: When vehicle proximity warning sound output conditions are met, an internal malfunction is continuously detected in the Toyota Prius vehicle approaching speaker controller. Malfunction duration: 1 second or more	Vehicle approaching speaker controller Vehicle approaching speaker assembly Harness or connector	Acoustic Toyota Prius Vehicle Alerting System	A

WIRING DIAGRAM

PROCEDURE

1.	INSPECT Toyota Prius Vehicle APPROACHING SPEAKER ASSEMBLY

Click here

NG

REPLACE VEHICLE APPROACHING SPEAKER ASSEMBLY

OK

2.	CHECK HARNESS AND CONNECTOR (Toyota Prius Vehicle APPROACHING SPEAKER ASSEMBLY - VEHICLE APPROACHING SPEAKER CONTROLLER)

Pre-procedure1

(a) Disconnect the A59 vehicle approaching speaker controller connector.

(b) Disconnect the A33 vehicle approaching speaker assembly connector.

Procedure1

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

Standard Resistance:

Click Location & Routing(A33,A59) Click Connector(A33) Click Connector(A59)

Tester Connection	Condition	Specified Condition	Result
A33-2 ( ) - A59-3 (SP )	Always	Below 1 Ω	Ω
A33-1 (-) - A59-4 (SP-)	Always	Below 1 Ω	Ω
A33-2 ( ) or A59-3 (SP ) - Body ground	Always	10 kΩ or higher	kΩ
A33-1 (-) or A59-4 (SP-) - Body ground	Always	10 kΩ or higher	kΩ
A33-1 (-) - A33-2 ( )	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

OK

REPLACE Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Lost Communication With Brake System Control Module Missing Message (U012987,U014087,U029387)

DESCRIPTION

These DTCs are stored when the CAN communication system is malfunctioning.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
U012987	Lost Communication With Brake System Control Module Missing Message	The Toyota Prius vehicle approaching speaker controller does not receive data from the No. 2 skid control ECU (brake actuator assembly) for approximately 10 seconds or more.	CAN communication system No. 2 skid control ECU (brake actuator assembly)	Acoustic Toyota Prius Vehicle Alerting System	B
U014087	Lost Communication with Body Control Module Missing Message	The vehicle approaching speaker controller does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.	CAN communication system Main body ECU (multiplex network body ECU)	Acoustic Toyota Prius Vehicle Alerting System	B
U029387	Lost Communication with Hybrid/EV Powertrain Control Module Missing Message	The Toyota Prius vehicle approaching speaker controller does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.	CAN communication system Hybrid vehicle control ECU	Acoustic Toyota Prius Vehicle Alerting System	B

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Trouble Codes

HINT:

When DTCs indicating a CAN communication system malfunction are output, perform troubleshooting for the CAN communication system before the acoustic vehicle alerting system.

NEXT

GO TO CAN COMMUNICATION SYSTEM for HEV Model: Click here for PHEV Model: Click here

Software Incompatibility with Body Control Module Invalid/Incompatible Software Component (U032257)

DESCRIPTION

The vehicle approaching speaker controller receives vehicle information from the main body ECU (multiplex network body ECU) via CAN communication.

This DTC is stored when the vehicle information from the main body ECU (multiplex network body ECU) and that stored in the Toyota Prius vehicle approaching speaker controller do not match.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
U032257	Software Incompatibility with Body Control Module Invalid/Incompatible Software Component	The Toyota Prius vehicle information from the main body ECU (multiplex network body ECU) and that stored in the vehicle approaching speaker controller do not match.	CAN communication system Main body ECU (Multiplex network body ECU)	Acoustic Toyota Prius Vehicle Alerting System	A

CAUTION / NOTICE / HINT

HINT:

The vehicle approaching speaker controller automatically updates the Toyota Prius vehicle information based on the data received from the main body ECU (multiplex network body ECU).

PROCEDURE

1.	CHECK DTC OUTPUT (HEALTH CHECK)

(a) According to the display on the GTS, select "Health Check".

OK:

DTCs are not output by any system other than the acoustic Toyota Prius vehicle alerting system (Acoustic Vehicle Alerting System).

Result	Proceed to
U032257 is not output by a system other than the acoustic vehicle alerting system	A
U032257 is output by a system other than the acoustic Toyota Prius vehicle alerting system	B

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

A

2.	REPLACE Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER

HINT:

Click here

NEXT

3.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Clear DTCs

(b) Turn the ignition switch off.

NEXT

4.	CHECK FOR DTCs

(a) Check for DTCs.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Trouble Codes

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

A

END (Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER IS DEFECTIVE)

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

There is No Sound Made

DESCRIPTION

Based on signals received from each ECU, the vehicle approaching speaker controller outputs warning sounds through the vehicle approaching speaker assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Trouble Codes

Result	Proceed to
B135013 and B135019 are not output	A
B135013 or B135019 is output	B

B

GO TO DTC CHART B135013

A

2.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Acoustic Toyota Prius Vehicle Alerting System > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Proximity Sound (20km/h,12MPH)	20 km/h (12 mph) Toyota Prius vehicle proximity warning sound	OFF or ON	-

Body Electrical > Acoustic Vehicle Alerting System > Active Test

Tester Display
Proximity Sound (20km/h,12MPH)

Result	Proceed to
The warning sound is produced	A
The warning sound is not produced	B

A

REPLACE Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER

B

3.	CHECK HARNESS AND CONNECTOR (Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER - POWER SOURCE AND BODY GROUND)

(a) Disconnect the A59 vehicle approaching speaker controller connector.

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

Standard Voltage:

Click Location & Routing(A59) Click Connector(A59)

Tester Connection	Condition	Specified Condition
A59-7 ( B) - Body ground	Ignition switch off	11 to 14 V

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

Standard Resistance:

Click Location & Routing(A59) Click Connector(A59)

Tester Connection	Condition	Specified Condition
A59-12 (GND) - Body ground	Always	Below 1 Ω

OK

REPLACE Toyota Prius Vehicle APPROACHING SPEAKER CONTROLLER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR