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 and switch (for driver 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 driver side seat normally.
OK:
Manual switch of the front power seat can move driver side seat normally.
OK -- REPLACE POSITION CONTROL ECU AND SWITCH (for Driver Side)
NG -- Continue to next step.
2. CHECK WIRE HARNESS (POSITION CONTROL ECU AND SWITCH - BATTERY AND BODY GROUND)





(a) Disconnect the b7and b8 ECU connectors.
(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 LC, V3 and b7 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPAIR OR REPLACE POSITION CONTROL AND SWITCH AND WIRE HARNESS OR CONNECTOR
A -- REPLACE POSITION CONTROL ECU AND SWITCH (for Driver Side)