Toyota Prius: Lin Communication System

Toyota Prius (XW60) 2023-2025 Service Manual / Power Source/Network / Networking / Lin Communication System

Precaution
Parts Location
System Description
How To Proceed With Troubleshooting
Terminals Of Ecu
Data List / Active Test
Diagnostic Trouble Code Chart
P/W Master SW System Missing Message (B120687,B232187-B232487)
LIN Communication Missing Message (B228787)
Door LIN Bus off (B232588)
Alarm / Wiper LIN Bus off (B276C88)
Communication between ECUs connected by LIN Bus off (B278588)
ID-BOX Missing Message (B278987)
Power Source Control System Missing Message (B278C87)

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

Parts Location

PARTS LOCATION

ILLUSTRATION

*A	w/ Auto Wiper System	-	-
*1	POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR)	*2	POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR)
*3	POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR)	*4	POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR)
*5	RAIN SENSOR	-	-

ILLUSTRATION

MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

ID CODE BOX (IMMOBILISER CODE ECU)

MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

DLC3

POWER DISTRIBUTION BOX ASSEMBLY

- ECU-B NO. 1 FUSE

- ECU-B NO. 2 FUSE

- DOOR F/L FUSE

- DOOR F/R FUSE

- DOOR R/L FUSE

- DOOR R/R FUSE

System Description

SYSTEM DESCRIPTION

LIN COMMUNICATION SYSTEM DESCRIPTION

The LIN communication system is used for communication between the components in the tables below. If communication cannot be performed through LIN communication such as when there is an open or short in a communication line, the master control ECU of the relevant system will store a DTC. Refer to the table below about the communication bus lines and connected components.

HINT:

Each component has a fail-safe function which operates in the event of a malfunction to protect the system and allow communication between other components to continue.
In the following table, "○" indicates that the function applies, and "-" indicates that it does not.

Door Bus Lines

Component	Master Control	LIN Communication DTC Output Function
Main Body ECU (Multiplex Network Body ECU)	○	○
Power Window Regulator Motor Assembly LH (Driver Door)	-	-
Power Window Regulator Motor Assembly RH (Front Passenger Door)	-	-
Power Window Regulator Motor Assembly LH (Rear LH Door)	-	-
Power Window Regulator Motor Assembly RH (Rear RH Door)	-	-
Multiplex Network Master Switch Assembly	-	-

Certification Bus Lines

Component	Master Control	LIN Communication DTC Output Function
Certification ECU (Smart Key ECU Assembly)	○	○
ID Code Box (Immobiliser Code ECU)	-	-

Sensor Bus Lines (w/ Auto Wiper System)

Component	Master Control	LIN Communication DTC Output Function
Main Body ECU (Multiplex Network Body ECU)	○	○
Rain Sensor	-	-

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the LIN communication system.
*: Use the GTS.

PROCEDURE

1.	Toyota Prius Vehicle BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
The following 5 items are important points for problem analysis:

What	Toyota Prius Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

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.

4.	INSPECT COMMUNICATION FUNCTION OF 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

GO TO CAN COMMUNICATION SYSTEM

for HEV Model: Click here

for PHEV Model: Click here

5.	INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

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

Body Electrical > Main Body > Trouble Codes Body Electrical > Power Source Control > Trouble Codes Body Electrical > Smart Key > Trouble Codes

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

GO TO DIAGNOSTIC TROUBLE CODE CHART

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

7.	REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

Terminals Of Ecu

TERMINALS OF ECU

CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the z1 main body ECU (multiplex network body ECU) connector.

Click here

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
z1-13 (GND1) - Body ground	Ground	Always	Below 1 Ω
z1-14 (GND2) - Body ground	Ground	Always	Below 1 Ω
z1-26 (BECU) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
z1-27 (IGR) - Body ground	IG power supply	Ignition switch ON	11 to 14 V
z1-27 (IGR) - Body ground	IG power supply	Ignition switch off	Below 1 V

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
R17-17 - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) Disconnect the O8 multiplex network master switch assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
O8-1 (B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
O8-4 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
O8-3 (LIN1) - Body ground	LIN communication line	Ignition switch ON	Pulse generation
O8-9 (LIN2) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR)

(a) Disconnect the O5 power window regulator motor assembly LH (driver door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
O5-2 (B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
O5-1 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
O5-9 (LIN) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR)

(a) Disconnect the N4 power window regulator motor assembly RH (front passenger door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
N4-2 (B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
N4-1 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
N4-9 (LIN) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR)

(a) Disconnect the M2 power window regulator motor assembly LH (rear LH door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
M2-2 (B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
M2-1 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
M2-9 (LIN) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR)

(a) Disconnect the L2 power window regulator motor assembly RH (rear RH door) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
L2-2 (B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
L2-1 (GND) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
L2-9 (LIN) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the K13 certification ECU (smart key ECU assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K13-6 ( B) - Body ground	Auxiliary battery power supply	Ignition switch off	11 to 14 V
K13-29 (E) - Body ground	Ground	Always	Below 1 Ω

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K13-8 (LIN) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK ID CODE BOX (IMMOBILISER CODE ECU)

(a) Disconnect the K43 ID code box (immobiliser code ECU) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K43-5 (GND) - Body ground	Ground	Always	Below 1 Ω
K43-1 ( B) - Body ground	B power supply	Ignition switch off	11 to 14 V

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
K43-2 (LIN1) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

CHECK RAIN SENSOR (w/ Auto Wiper System)

(a) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
U4-3 (MPX) - Body ground	LIN communication line	Ignition switch ON	Pulse generation

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

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.

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.

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Communication D-Door Motor	Connection status between power window regulator motor assembly LH (driver door) and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTC is output if an error occurs in LIN communication.
Communication P-Door Motor	Connection status between power window regulator motor assembly RH (front passenger door) and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTC is output if an error occurs in LIN communication.
Communication RR-Door Motor	Connection status between power window regulator motor assembly RH (rear RH door) and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTC is output if an error occurs in LIN communication.
Communication RL-Door Motor	Connection status between power window regulator motor assembly LH (rear LH door) and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTC is output if an error occurs in LIN communication.
Communication Intrusion Sensor 1	Connection status between map light assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Not applicable Although the item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Intrusion Sensor 2	Connection status between map light assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Not applicable Although the item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Sunshade ECU	Connection status between roof sunshade ECU and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Not applicable Although the item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Slide Roof	Connection status between sliding roof ECU and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Not applicable Although the item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Humidity/Rain Sensor	Connection status between rain sensor and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	w/ Auto Wiper System DTC is output if an error occurs in LIN communication.
Communication Double Locking	Connection status between double lock door control relay assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	Not applicable Although the item is displayed on the GTS, it is not applicable to this Toyota Prius vehicle.
Communication Master Switch	Connection status between multiplex network master switch assembly and main body ECU (multiplex network body ECU)	STOP or OK	STOP: Not Connected OK: Connected	DTC is output if an error occurs in LIN communication.

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

LIN Communication System

DTC No.	Detection Item	DTC Output from	Priority
B120687	P/W Master SW System Missing Message	Main Body	A
B228787	LIN Communication Missing Message	Power Source Control	B
B232187	D-Door P/W System Missing Message	Main Body	A
B232287	P-Door P/W System Missing Message	Main Body	A
B232387	RR-Door P/W System Missing Message	Main Body	A
B232487	RL-Door P/W System Missing Message	Main Body	A
B232588	Door LIN Bus off	Main Body	A
B276C88	Alarm / Wiper LIN Bus off	Main Body	A
B278588	Communication between ECUs connected by LIN Bus off	Smart Key	A
B278987	ID-BOX Missing Message	Smart Key	A
B278C87	Power Source Control System Missing Message	Smart Key	A

P/W Master SW System Missing Message (B120687,B232187-B232487)

DESCRIPTION

This DTC is stored when LIN communication between the main body ECU (multiplex network body ECU) and multiplex network master switch assembly, power window regulator motor assembly LH (driver door), power window regulator motor assembly RH (front passenger door), power window regulator motor assembly RH (rear RH door) or power window regulator motor assembly LH (rear LH door) stops for 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B120687	P/W Master SW System Missing Message	No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Multiplex network master switch assembly Wire harness or connector	Main Body	A
B232187	D-Door P/W System Missing Message	No communication between power window regulator motor assembly LH (driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Multiplex network master switch assembly Power window regulator motor assembly LH (driver door) Wire harness or connector	Main Body	A
B232287	P-Door P/W System Missing Message	No communication between power window regulator motor assembly RH (front passenger door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Power window regulator motor assembly RH (front passenger door) Wire harness or connector	Main Body	A
B232387	RR-Door P/W System Missing Message	No communication between power window regulator motor assembly RH (rear RH door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Power window regulator motor assembly RH (rear RH door) Wire harness or connector	Main Body	A
B232487	RL-Door P/W System Missing Message	No communication between power window regulator motor assembly LH (rear LH door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Power window regulator motor assembly LH (rear LH door) Wire harness or connector	Main Body	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
When a power window regulator motor assembly is replaced or removed and reinstalled, it is necessary to perform initialization.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTCs are not output	A
B120687, B232187, B232287, B232387 and B232487 are output	B
B120687, B232187, B232387 and B232487 are output	C
B120687, B232187 and B232487 are output	D
B120687 and B232187 are output	E
Only B120687 is output	F
Only B232187 is output	G
Only B232287 is output	H
Only B232387 is output	I
Only B232487 is output	J

USE SIMULATION METHOD TO CHECK

GO TO STEP 5

GO TO STEP 6

GO TO STEP 7

GO TO STEP 8

GO TO STEP 11

GO TO STEP 13

GO TO STEP 15

3.	INSPECT POWER DISTRIBUTION BOX ASSEMBLY

Pre-procedure1

(a) Remove the power distribution box assembly.

HINT:

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Procedure1

Component without harness connected

(Power Distribution Box Assembly)

HINT:

This inspection is to check the LIN communication line in the power distribution box assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Click Location & Routing(z1,R17) Click Connector(z1) Click Connector(R17)

Tester Connection	Condition	Specified Condition	Result
z1-15 (LIN2) - R17-17	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR))

Pre-procedure1

(a) Disconnect the M2 power window regulator motor assembly LH (rear LH door) connector.

Procedure1

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Click Location & Routing(R17,M2) Click Connector(R17) Click Connector(M2)

Tester Connection	Condition	Specified Condition	Result
R17-17 - M2-9 (LIN)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR))

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect the N4 power window regulator motor assembly RH (front passenger door) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(R17,N4) Click Connector(R17) Click Connector(N4)

Tester Connection	Condition	Specified Condition	Result
R17-17 - N4-9 (LIN)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect the O8 multiplex network master switch assembly connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(R17,O8) Click Connector(R17) Click Connector(O8)

Tester Connection	Condition	Specified Condition	Result
R17-17 - O8-3 (LIN1)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

Pre-procedure1

(a) Disconnect the O8 multiplex network master switch assembly connector.

Procedure1

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

Standard Voltage:

Click Location & Routing(O8) Click Connector(O8)

Tester Connection	Condition	Specified Condition	Result
O8-1 (B) - Body ground	Ignition switch off	11 to 14 V	V

Standard Resistance:

Click Location & Routing(O8) Click Connector(O8)

Tester Connection	Condition	Specified Condition	Result
O8-4 (GND) - Body ground	Always	Below 1 Ω	Ω

Post-procedure1

(d) None

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

Pre-procedure1

(a) Remove the multiplex network master switch assembly.

HINT:

Click here

Procedure1

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

Standard Resistance:

Click Location & Routing(O8) Click Connector(O8)

Tester Connection	Condition	Specified Condition	Result
O8-9 (LIN2) - O8-3 (LIN1)	Always	Below 1 Ω	Ω

Result:

Proceed to
OK
NG

*a	Component without harness connected (Multiplex Network Master Switch Assembly)

Post-procedure1

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

9.	CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR))

Pre-procedure1

(a) Disconnect the O5 power window regulator motor assembly LH (driver door) connector.

Procedure1

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

NOTICE:

Standard Resistance:

Click Location & Routing(O8,O5) Click Connector(O8) Click Connector(O5)

Tester Connection	Condition	Specified Condition	Result
O8-9 (LIN2) - O5-9 (LIN)	Always	Below 1 Ω	Ω

Post-procedure1

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Click Location & Routing(O5) Click Connector(O5)

Tester Connection	Condition	Specified Condition	Result
O5-2 (B) - Body ground	Ignition switch off	11 to 14 V	V

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

Standard Resistance:

Click Location & Routing(O5) Click Connector(O5)

Tester Connection	Condition	Specified Condition	Result
O5-1 (GND) - Body ground	Always	Below 1 Ω	Ω

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR))

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect the N4 power window regulator motor assembly RH (front passenger door) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(R17,N4) Click Connector(R17) Click Connector(N4)

Tester Connection	Condition	Specified Condition	Result
R17-17 - N4-9 (LIN)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Click Location & Routing(N4) Click Connector(N4)

Tester Connection	Condition	Specified Condition	Result
N4-2 (B) - Body ground	Ignition switch off	11 to 14 V	V

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

Standard Resistance:

Click Location & Routing(N4) Click Connector(N4)

Tester Connection	Condition	Specified Condition	Result
N4-1 (GND) - Body ground	Always	Below 1 Ω	Ω

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR))

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect the L2 power window regulator motor assembly RH (rear RH Door) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(R17,L2) Click Connector(R17) Click Connector(L2)

Tester Connection	Condition	Specified Condition	Result
R17-17 - L2-9 (LIN)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Click Location & Routing(L2) Click Connector(L2)

Tester Connection	Condition	Specified Condition	Result
L2-2 (B) - Body ground	Ignition switch off	11 to 14 V	V

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

Standard Resistance:

Click Location & Routing(L2) Click Connector(L2)

Tester Connection	Condition	Specified Condition	Result
L2-1 (GND) - Body ground	Always	Below 1 Ω	Ω

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR))

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect the M2 power window regulator motor assembly LH (rear LH door) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(R17,M2) Click Connector(R17) Click Connector(M2)

Tester Connection	Condition	Specified Condition	Result
R17-17 - M2-9 (LIN)	Ignition switch off	Below 1 Ω	Ω

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Click Location & Routing(M2) Click Connector(M2)

Tester Connection	Condition	Specified Condition	Result
M2-2 (B) - Body ground	Ignition switch off	11 to 14 V	V

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

Standard Resistance:

Click Location & Routing(M2) Click Connector(M2)

Tester Connection	Condition	Specified Condition	Result
M2-1 (GND) - Body ground	Always	Below 1 Ω	Ω

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR

LIN Communication Missing Message (B228787)

DESCRIPTION

When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B228787	LIN Communication Missing Message	An internal malfunction occurs in the certification ECU (smart key ECU assembly).	Certification ECU (smart key ECU assembly)	Power Source Control	B

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

Result	Proceed to
B278588 is not output	A
B278588 is output	B

GO TO DTC CHART

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Power Source Control > Trouble Codes

3.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Power Source Control > Trouble Codes

Result	Proceed to
B228787 is not output	A
B228787 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Door LIN Bus off (B232588)

DESCRIPTION

If the main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 8 seconds or more, DTC B232588 will be stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B232588	Door LIN Bus off	The main body ECU (multiplex network body ECU) detects a communication error with an ECU connected to the door bus lines for 8 seconds or more.	Main body ECU (multiplex network body ECU) Power distribution box assembly Multiplex network master switch assembly Power window regulator motor assembly LH (driver door) Power window regulator motor assembly RH (front passenger door) Power window regulator motor assembly LH (rear LH door) Power window regulator motor assembly RH (rear RH door) Wire harness or connector	Main Body	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When a power window regulator motor assembly is replaced or removed and reinstalled, it is necessary to perform initialization.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

CLEAR DTC

Pre-procedure1

(a) Disconnect the O5 power window regulator motor assembly LH (driver door) connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

2.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR)

(a) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B232588 is not output	A
B232588 is not output	B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR)

CLEAR DTC

Pre-procedure1

(a) Disconnect the O8 multiplex network master switch assembly connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

4.	CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

(a) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B232588 is output	A
B232588 is not output	B

GO TO STEP 14

CLEAR DTC

Pre-procedure1

(a) Disconnect the N4 power window regulator motor assembly RH (front passenger door) connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

6.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR)

(a) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B232588 is output	A
B232588 is not output	B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (FRONT PASSENGER DOOR)

CLEAR DTC

Pre-procedure1

(a) Disconnect the L2 power window regulator motor assembly RH (rear RH door) connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

8.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR)

(a) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B232588 is output	A
B232588 is not output	B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (REAR RH DOOR)

CLEAR DTC

Pre-procedure1

(a) Disconnect the M2 power window regulator motor assembly LH (rear LH door) connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

10.	CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR)

(a) After 10 seconds have elapsed, check if the same DTC is output again.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B232588 is output	A
B232588 is not output	B

REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (REAR LH DOOR)

11.	CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - EACH ECU)

Pre-procedure1

(a) Disconnect the R17 power distribution box assembly connector.

(b) Disconnect all connectors shown in the wiring diagram.

Procedure1

Standard Resistance:

Click Location & Routing(R17) Click Connector(R17)

Tester Connection	Condition	Specified Condition	Result
R17-17 - Body ground	Always	10 kΩ or higher	kΩ
R17-17 - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	INSPECT POWER DISTRIBUTION BOX ASSEMBLY

Pre-procedure1

(a) Remove the power distribution box assembly.

HINT:

Click here

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Procedure1

Component without harness connected

(Power Distribution Box Assembly)

HINT:

This inspection is to check the LIN communication line in the power distribution box assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

Standard Resistance:

Click Location & Routing(R17,K20,K21,z1) Click Connector(R17) Click Connector(K20) Click Connector(K21) Click Connector(z1)

Tester Connection	Condition	Specified Condition	Result
R17-17 - K20-36 or K21-41	Always	10 kΩ or higher	kΩ
z1-15 (LIN2) - Other terminals	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

13.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Pre-procedure1

(a) Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

HINT:

Click here

(b) Connect all power distribution box assembly connectors other than R17.

Procedure1

Component with harness connected

(Power Distribution Box Assembly)

Waveform

HINT:

This inspection is to check the LIN communication line in the power distribution box assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

OK:

Click Location & Routing(R17) Click Connector(R17)

Tester Connection

Condition

Tool Setting

Specified Condition

R17-17 - Body ground

Ignition switch ON

2 V/DIV., 200 ms/DIV.

Pulse generation

(See waveform)

Post-procedure1

(d) None

USE SIMULATION METHOD TO CHECK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

14.	CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER DOOR))

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

Standard Resistance:

Click Location & Routing(O8) Click Connector(O8)

Tester Connection	Condition	Specified Condition	Result
O8-9 (LIN2) - Body ground	Always	10 kΩ or higher	kΩ
O8-9 (LIN2) - Other terminals	Always	10 kΩ or higher	kΩ

REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Alarm / Wiper LIN Bus off (B276C88)

DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B276C88	Alarm / Wiper LIN Bus off	No communication between main body ECU (multiplex network body ECU) and rain sensor for 10 seconds or more.	Main body ECU (multiplex network body ECU) Rain sensor Harness or connector	Main Body	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the Toyota Prius vehicle begins, and then select the vehicle model manually.
Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less to maintain communication between the GTS and the Toyota Prius vehicle.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B276C88 is not output	A
B276C88 is output	B

USE SIMULATION METHOD TO CHECK

CLEAR DTC

Pre-procedure1

(a) Disconnect the U4 rain sensor connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Post-procedure1

4.	CHECK RAIN SENSOR

(a) Check if the DTC is output.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
B276C88 is output	A
B276C88 is not output	B

REPLACE RAIN SENSOR

5.	CHECK HARNESS AND CONNECTOR (LIN BUS CIRCUIT)

Pre-procedure1

(a) Disconnect the K16 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the U4 rain sensor connector.

Procedure1

Standard Resistance:

Click Location & Routing(K16) Click Connector(K16)

Tester Connection	Condition	Specified Condition	Result
K16-11 (LIN4) - Body ground	Always	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Communication between ECUs connected by LIN Bus off (B278588)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B278588	Communication between ECUs connected by LIN Bus off	No communication between ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) for 10 seconds or more.	Certification ECU (smart key ECU assembly) ID code box (immobiliser code ECU) Wire harness or connector	Smart Key	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before performing the inspection, check that DTC B278987 or B278C87 is not output.
Click here
When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the Toyota Prius vehicle begins, and then select the vehicle model manually.
Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less to maintain communication between the GTS and the Toyota Prius vehicle.
Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Registration.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU))

Pre-procedure1

(a) Disconnect the K13 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the K43 ID code box (immobiliser code ECU) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(K13,K43) Click Connector(K13) Click Connector(K43)

Tester Connection	Condition	Specified Condition	Result
K13-8 (LIN) - K43-2 (LIN1)	Ignition switch off	Below 1 Ω	Ω
K13-8 (LIN) or K43-2 (LIN1) - Body ground	Ignition switch off	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

Pre-procedure1

(a) Connect the K13 certification ECU (smart key ECU assembly) connector.

Procedure1

(b) Clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

Post-procedure1

3.	CHECK FOR DTC

(a) Recheck for DTCs.

Body Electrical > Smart Key > Trouble Codes

Result	Proceed to
B278588 is output	A
B278588 is not output	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

ID-BOX Missing Message (B278987)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B278987	ID-BOX Missing Message	No communication between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more.	Certification ECU (smart key ECU assembly) ID code box (immobiliser code ECU) Wire harness or connector	Smart Key	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the Toyota Prius vehicle begins, and then select the vehicle model manually.
Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less to maintain communication between the GTS and the Toyota Prius vehicle.
Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Registration.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU))

Pre-procedure1

(a) Disconnect the K13 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the K43 ID code box (immobiliser code ECU) connector.

Procedure1

NOTICE:

Standard Resistance:

Click Location & Routing(K13,K43) Click Connector(K13) Click Connector(K43)

Tester Connection	Condition	Specified Condition	Result
K13-8 (LIN) - K43-2 (LIN1)	Ignition switch off	Below 1 Ω	Ω
K13-8 (LIN) or K43-2 (LIN1) - Body ground	Ignition switch off	10 kΩ or higher	kΩ

Post-procedure1

(d) None

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Click Location & Routing(K43) Click Connector(K43)

Tester Connection	Condition	Specified Condition	Result
K43-1 ( B) - Body ground	Ignition switch off	11 to 14 V	V

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

Standard Resistance:

Click Location & Routing(K43) Click Connector(K43)

Tester Connection	Condition	Specified Condition	Result
K43-5 (GND) - Body ground	Always	Below 1 Ω	Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

(a) Replace the ID code box (immobiliser code ECU).

HINT:

Click here

4.	REGISTER ECU CODE REGISTRATION

(a) Register the recognition codes in the ECUs.

HINT:

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

6.	CHECK FOR DTC

(a) Recheck for DTCs.

Body Electrical > Smart Key > Trouble Codes

Result	Proceed to
B278987 is not output	A
B278987 is output	B

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Power Source Control System Missing Message (B278C87)

DESCRIPTION

When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B278C87	Power Source Control System Missing Message	An internal malfunction occurs in the certification ECU (smart key ECU assembly).	Certification ECU (smart key ECU assembly)	Smart Key	A