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 INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect rear power window switch LH connector.
3. Check signal between rear power window switch LH harness connector and ground with oscilloscope when door lock and unlock switch (driver side and passenger side) is turned to "LOCK" or "UNLOCK".
4. Check that signals which are shown in the figure below can be detected during 10 second just after door lock and unlock switch (driver side and passenger side) is turned to "LOCK" or "UNLOCK".





Is the inspection result normal?
YES - Replace rear power window switch LH. Rear Power Window Switch.
NO - GO TO 2.
2.CHECK POWER WINDOW SERIAL LINK CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector and rear power window switch LH harness connector.





3. Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES - Replace BCM. Exploded View.
NO - Repair or replace harness.