B1289

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1289: Passenger Seat ECU Communication Stop
B1289 - Passenger Seat ECU Communication Stop

SYSTEM DESCRIPTION

This DTC is detected when communication between the position control ECU and switch (passenger ECU) and network gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION

(a) Check that the manual switch of the front power seat can move the passenger side seat normally.

OK:

Manual switch of front power seat can move passenger side seat normally.

NG -- CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY AND BODY GROUND)

OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR

2. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY AND BODY GROUND)





(a) Disconnect the a6 and a7 ECU connector.

(b) Measure the resistance and voltage of the wire harness side connectors.

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. CHECK RESISTANCE OF COMMUNICATION LINE





(a) Disconnect the a7 and M4 ECU connectors.

(b) Measure the resistance of the wire harness side connectors.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY