B1289

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

DTC B1289 - Passenger Seat ECU Communication Stop

DESCRIPTION

This DTC is detected when communication between the position control ECU (passenger seat 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 the front power seat can move the passenger side seat normally.
OK -- REPLACE POSITION CONTROL ECU
NG -- Continue to next step.
2. CHECK WIRE HARNESS (POSITION CONTROL ECU - BATTERY AND BODY GROUND)




(a) Disconnect the P23 and P24 ECU connectors.
(b) Measure the voltage and resistance of the wire harness side connectors.
Standard voltage:






Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE




(a) Disconnect the P21, P23 and S18 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS AND CONNECTOR
B -- REPLACE POSITION CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR
A -- REPLACE POSITION CONTROL ECU