Left Rear Window Does Not Open With Either Left Rear Power Window Switch Depressed
- Turn ignition switch to ON position. Using test light, backprobe between left rear door power window switch connector terminal No. 2 (Blue/Black wire) and ground. Depress left rear power window switch in left front power window/door lock switch to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, check for open in Blue/Black wire. If Blue/Black wire is okay, replace left front power window/door lock switch.
- Using test light, backprobe between left rear power window motor connector terminal No. 1 (Red wire) and ground. Depress left rear power window switch in left front power window/door lock switch to DOWN position. If test light illuminates, go to next step. If test light does not illuminate, check for open in Green wire between left rear power window switch and left rear power window motor. If Green wire is okay, replace left rear door power window switch.
- Turn ignition to LOCK position. Disconnect left rear power window motor connector. Using test light, backprobe between left rear power window motor connector terminal No. 2 (Yellow wire) and battery voltage. Ensure both left rear power window switches are released. If test light does not illuminate, go to next step. If test light illuminates, replace left rear door power window motor.
- Using test light, backprobe between left rear power window motor connector terminal No. 4 (Red/Green wire) and battery voltage. Ensure left rear and master power window switches are released. If test light does not illuminate, check for open in Red/Green wire between left front power window/door lock switch and left rear door power window switch. If test light illuminates, check for open in Yellow wire between left rear door power window switch and left rear power window motor. If Yellow wire is okay, replace left rear door power window switch.
Courtesy of GENERAL MOTORS CORP.