The power windows can be controlled from the driver's seat using the master switch, or by manipulating the individual door switches. Each of the glasses is equipped with a separate reversible type drive motor. Switching the control key changes the polarity of the motor connection and, as a result, the direction of its rotation. Some systems use a relay to control the power supply to the electric motors.
The circuit is protected by a fuse and a circuit breaker. On some models, each of the electric motors is individually protected by its own circuit breaker, which prevents the entire system from being damaged if an individual glass is jammed.
The power windows operate only when the ignition is on. Additionally, on many models it is possible to lock the rear windows (and sometimes the front passenger) doors from the main switch. Keep this feature in mind when checking drive failures.
The described checks are of the most general nature, so if their performance does not allow you to unambiguously identify the cause of the failure, drive the car to a service station for more detailed diagnostics.
In the event of power window failure, always check the condition of the fuse and/or circuit breaker first.
If the rear door windows are operated only from the main switch, check the continuity of the interlock switch in the released state. Replace defective switch.
Check the condition of the wiring in the section of the circuit between the switches and the fuse box. Make the necessary repairs.
If only one of the windows from the main switch fails to function, check the correct operation of this window lifter from the individual switch. Note: This does not apply to the driver's door power window.
If only one of the two switches operates the power window, check the suspected switch for proper operation (conductance distribution).
If the switch is OK, check for an open and short in the circuit between the appropriate switch and the power window drive motor for that window.
If the power window does not work from both switches, remove the trim panel from this door and check the power supply to both the switch itself and the regulator drive motor (with appropriate switch position).
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With proper power supply to the electric motor, separate the glass from the window regulator (see chapter Body) and move it up and down, checking the freedom of movement. Also check the condition of the regulator. If the regulator is normal, and the glass moves freely in both directions, replace the drive motor. If the smooth movement of components is disturbed, eliminate the detected interference, lubricate the rubbing nodes and replace the damaged parts.
If power is not supplied to the motor, check for continuity in the wiring in the section of the circuit between the switches and motors (if necessary, refer to the wiring diagrams at the end of this Chapter). If the circuit is equipped with an output relay, check that the latter is powered and grounded properly. make sure that the relay properly supplies voltage to the switched on electric motor, if necessary, replace the relay.
After making the necessary corrections, recheck the operation of the power windows.