Principles of Operation (How Does It Work?)

PRINCIPLES OF OPERATION

The power operated windows are activated by switches on each passenger door or by a multiple switch on the driver door. The driver door window control switch is a two stage switch and incorporates the one-touch up/down feature.

Voltage to the power window system is supplied through the accessory delay relay and the central junction box (CJB) fuse 25 (30A). When the delayed accessory relay is energized, voltage is supplied to all window switches. When a window switch is activated power and ground paths are supplied to the appropriate side of the door window regulator to drive it in the desired direction.

The delayed accessory relay provides power for the operation of the power windows. The delayed accessory feature is active when the ignition switch is in the RUN or the ACC position, or when the ignition switch is changed from RUN or ACC to the OFF/LOCK position and the LF and RF doors are closed.

The generic electronic module (GEM) will deactivate the delayed accessory feature when:
- The LF door is ajar and the ignition switch is in the OFF/LOCK or KEY-OUT position.
- The RF door is ajar and the ignition switch is in the OFF/LOCK or KEY-OUT position.
- 10 minutes have elapsed since the ignition switch was changed from ACC or RUN to the OFF/LOCK position.

The heated rear window grid is activated by the rear window defrost switch located on the instrument panel. When the rear window defrost switch is activated, a ground path is supplied to the GEM. The GEM then provides a ground path for the rear window defrost relay, located in the battery junction box (BJB). When the rear defrost relay coil is energized, voltage from the BJB is supplied to the rear window defrost grid the rear window defrost switch and if equipped the exterior mirrors. The GEM controls the operational cycle timing for the rear window defrost relay.