B1289

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

SYSTEM DESCRIPTION

This DTC is detected if communication between the front power seat switch RH and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
If "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1289, repair the "+B or GND short malfunction of communication bus" DTCs first B1214.

PROCEDURE

1. INSPECT FUSE (FR P/SEAT RH, MPX-B)

(a) Remove the FR P/ SEAT RH fuse from the main body ECU RH (cowl side junction block RH).

(b) Remove the MPX-B fuse from engine room relay block No. 1.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE FUSE (FR P/SEAT RH, MPX-B)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - BATTERY AND BODY GROUND)

(a) Disconnect the T6 and T7 connectors.





(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT POWER SEAT SWITCH - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the T7, RJ and P33 connectors.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FRONT POWER SEAT SWITCH RH Removal