B1272

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1272: Power Seat ECU Communication Stop

DTC B1272 - Power Seat ECU Communication Stop

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK MANUAL SWITCH (OPERATION)
(a) Check that the manual switch of the front power seat can move the driver side seat normally.
OK:
Manual switch of the front power seat can move the driver 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 P21 and P22 ECU connectors.
(b) Measure the resistance and voltage 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 D17, P21 and P23 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 (DRIVER SEAT ECU)