Diagnosis Procedure

POWER WINDOW SERIAL LINK


REAR LH : Description

Power window main switch, front power window switch (passenger side), rear power window switch and BCM transmit and receive the signal by power window serial link.
The signal mentioned below is transmitted from BCM to power window main switch, front power window switch (passenger side) and rear power window switch.
- Keyless power window down signal
The signal mentioned below is transmitted from power window main switch to front power window switch (passenger side) and rear power window switch.
- Front passenger side door window and rear door window operation signal
- Power window control by key cylinder switch signal
- Power window lock switch signal
- Retained power operation signal




POWER WINDOW SERIAL LINK


REAR LH : Diagnosis Procedure

1.CHECK POWER WINDOW SWITCH OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Check signal between rear power window switch LH harness connector and ground.





Is the inspection result normal?
YES - Replace rear power window switch LH. Refer to Service and Repair.
NO - GO TO 2.
2.CHECK POWER WINDOW SERIAL LINK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and rear power window switch LH connector.
3. Check continuity between BCM harness connector and rear power window switch LH harness connector.





4. Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES - Replace BCM. Refer to Removal and Installation.
NO - Repair or replace harness.