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 (for front passenger side) 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 front passenger side seat normally.

OK:

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

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

2. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH - 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 OR CONNECTOR
OK -- Continue to next step.

3. CHECK RESISTANCE OF COMMUNICATION LINE





(a) Disconnect the a7 and Q13 switch connectors.

(b) Disconnect the K73 ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH