Windows: Description and Operation

CAUTION:
- Each window regulator motor contains an electronic circuit breaker. The resistance in the window regulator motor increases if the motor is overloaded and the resistance will return to normal after voltage is removed from the motor terminals.
- A momentary actuation of the window switch can cause the window to move directly to the fully open position. When working on the door leave the ignition off whenever possible. Note where the window switch is so you do not accidentally hit it. To stop the window, press the LF window switch UP.

A Permanent Magnet (PM) Motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to it. The direction the motor turns depends on the polarity of the supply voltage. The window switches control the supply voltage polarity.

Each motor is protected by a built-in circuit breaker. If a window switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breaker resets only after voltage is removed from the motor.

LF Window Switch Operation
When the ignition switch is in the RUN position, battery voltage is applied to the LF window switch through the PWR WDO/RR VENT Circuit Breaker and circuit 141. When either of the up switches in the LF window switch are operated, battery voltage is applied to the window regulator motor. The window regulator motor is grounded through the down contact in the LF window switch and circuit 750. The motor runs to drive the window up. When either of the down switches in the LF window switch are operated battery voltage is applied to the window regulator motor in the opposite direction. The window regulator motor is grounded through the up contact in the LF window switch. The motor runs to drive the window down.

Express Down Feature
If the DN position in the LF window witch is momentarily pressed down past the first detent. the window will travel to the fully down position. To stop the window. press the LF window switch to the UP position.

RF Window Switch Operation
When the ignition switch is in the RUN position, battery voltage is applied to the RF window Switch from the PWR WDO/RR VENT Circuit Breaker (circuit 141). When the UP position in the RF window switch is pressed, battery voltage is applied to the RF window regulator motor through circuit 666. The motor is grounded through circuit 667, the down contact in the RF window switch, circuit 167, and the down contact in the LF window switch, and circuit 750 to G302. The motor runs to drive the window up. When the DN position in the RF window switch is pressed, battery voltage is applied to the RF window regulator motor in the opposite direction through circuit 667. The motor is grounded through circuit 666, the up contact in the RF window switch, circuit 166, the up contact in the LF window switch, and circuit 750 to G302. The motor runs to drive the window down.

Rear Quarter Window Switch Operation
On the interior lamp and Multi-function switch there is the rear quarter windows switch that allows you to open and close the LH and RH rear quarter windows. When the ignition switch is in the RUN position, battery voltage is applied to the rear quarter window switch. When the OPEN position is pressed, voltage is applied to the quarter window actuators (circuit 902). The quarter window actuators are grounded through the close contact (circuit 901) in the rear quarter window switch. The motor runs to drive the rear quarter windows open. When the CLOSE position is pressed battery voltage is applied to the motor in the opposite direction. The window motor is now grounded through the open contact (circuit 902) in the rear quarter window switch. This closes the rear quarter windows.