Power window system — description and check
1. The power window system operates electric motors, mounted in the doors, which lower and raise the windows. The system consists of the control switches, relays, the motors, regulators, glass mechanisms and associated wiring.
2. The power windows can be lowered and raised from the master control switch by the driver or by remote switches located at the individual windows. Each window has a separate motor which is reversible. The position of the control switch determines the polarity and therefore the direction of operation.
3. The circuit is protected by a fuse and a circuit breaker. Each motor is also equipped with an internal circuit breaker; this prevents one stuck window from disabling the whole system.
4. The power window system will only operate when the ignition switch is ON. In addition, many models have a window lockout switch at the master control switch which, when activated, disables the switches at the rear windows and, sometimes, the switch at the passenger’s window also. Always check these items before troubleshooting a window problem.
5. These procedures are general in nature, so if you can’t find the problem using them, take the vehicle to a dealer service department or other properly equipped repair facility.
6. If the power windows won’t operate, always check the fuse and circuit breaker first.
7. If only the rear windows are inoperative, or if the windows only operate from the master control switch, check the rear window lockout switch for continuity in the unlocked position. Replace it if it doesn’t have continuity.
8. Check the wiring between the switches and fuse panel for continuity. Repair the wiring, if necessary.
9. If only one window is inoperative from the master control switch, try the other control switch at the window.
Note: This doesn’t apply to the driver’s door window.
10. If voltage is reaching the motor, disconnect the glass from the regulator (see Body). Move the window up and down by hand while checking for binding and damage. Also check for binding and damage to the regulator. If the regulator is not damaged and the window moves up and down smoothly, replace the motor. If there’s binding or damage, lubricate, repair or replace parts, as necessary.
11. If voltage isn’t reaching the motor, check the wiring in the circuit for continuity between the switches and motors. You’ll need to consult the wiring diagram for the vehicle. If the circuit is equipped with a relay, check that the relay is grounded properly and receiving voltage.
12. Test the windows after you are done to confirm proper repairs.