Figure 15.61. Location of power window components: 1 – main window switch located on the driver's door; 2 – ignition switch; 3 – Driver's door window switch; 4 – fuses and relays for window lifters in the fuse and relay box; 5 – front door window lift motors; 6 – rear door window lift motors
An electric window lift raises or lowers the glass using an electric motor located in the door. The system consists of switches, relays, electric motors, window lift mechanisms and electrical circuits that connect all components (figure 15.61).
The windows are controlled by a main switch located on the driver's door or by separate switches located on each door. Each door has a reversible electric motor for the window lifters. The position of the switch determines the polarity of the voltage supplied to the electric motor.
Each electrical circuit is protected by a fuse and a circuit breaker (current relay). Each motor is also equipped with an internal circuit breaker.
Electric windows only operate when the ignition is on.
Check the window lifters as follows:
If the window lifts do not work, first check the integrity of the fuse and the condition of the circuit breaker.
If only the rear door windows do not work, or only work from the main switch, check the switches located in the rear doors and replace them if necessary.
Check the electrical circuit between the switch and the fuse/relay box and repair it if necessary.
If the power window of only one door does not work from the main switch, check the operation of the power window from the switch located on the door.
If the window regulator works only from one switch and not from the other, check the condition of that switch. If the switch is OK, check the electrical circuit between the switch and the corresponding motor and repair it if necessary.
If the window does not work from either switch, remove the door trim and check for voltage at the switch and motor with the switch on.
If power is supplied to the motor, disconnect the glass from the window lift mechanism, manually move the glass up and down, and ensure that the glass moves freely and without binding.
Also check the condition of the window lift mechanism. If the window lift mechanism is not damaged and the glass moves easily and without sticking, replace the electric motor.
If voltage is not supplied to the motor, check the electrical circuit between the switch and the corresponding motor and repair it if necessary.
After troubleshooting, check the operation of the window lifts.