GM Service Manual Online
For 1990-2009 cars only

The rear quarter window system consists of the following components:

    • Left quarter glass switch
    • Right quarter glass switch
    • Left quarter glass actuator
    • Right quarter glass actuator
    • VENT WDO Fuse 20A

Rear Quarter Window System Controls

The rear quarter windows are operated using the left and right quarter glass switches. The quarter glass switches are powered when the ignition is in RUN or retained accessory power (RAP) is enabled.

Rear Quarter Window System Operation

When the left or right quarter glass switch is activated to the Open position, battery positive voltage is applied to the left or right quarter glass actuators through the power window motor left or right rear vent open control circuit. Ground for the actuators is provided by the power window motor left or right rear vent close control circuit through the left or right quarter glass switch.

When the left or right quarter glass switch is activated to the Close position, battery positive voltage is applied to the left or right quarter glass actuators through the power window motor left or right rear vent close control circuit. Ground for the actuators is provided by the power window motor left or right rear vent open control circuit through the left or right quarter glass switch.