GM Service Manual Online
For 1990-2009 cars only

Endgate Power Window System Components

The endgate power window system consists of the following components:

    • Endgate window switch
    • Endgate key cylinder switch
    • Endgate window interior emergency switch
    • 4th button of the key fob
    • Power roof switch
    • Endgate window regulator
    • Endgate module
    • Power roof module
    • Endgate regulator 30-amp circuit breaker

Endgate Power Window System Controls

The endgate power window can be controlled by the following:

    • Endgate window switch Up, Down or Express Down activation
    • Endgate key cylinder switch Up or Down activation
    • Endgate window interior emergency switch activation
    • Activation of the 4th button of the key fob
    • Power roof switch activation
    • Endgate module
    • Power roof module

Endgate Power Window Operation

The endgate power window is controlled by the endgate key cylinder, an remote function actuator (RFA) signal from the 4th button of the key fob or a class 2 functional message from the power roof module.

When the endgate key cylinder is rotated clockwise, the endgate module provides 12 volts to the endgate window regulator down signal circuit, driving the endgate power window in the down direction. When the endgate key cylinder is rotated counterclockwise, the endgate module provides 12 volts to the endgate window regulator up signal circuit, driving the endgate power window in the up direction.

When the 4th button of the key fob is pressed twice, the endgate module provides 12 volts to the endgate window regulator down signal circuit, driving the endgate power window in the express down direction.

When the endgate window switch, the endgate window interior emergency switch or the power roof down switch has been activated, the power roof module sends a class 2 functional message to the endgate module to provide 12 volts to the endgate window regulator signal circuits, driving the endgate power window in the requested direction.

TAILGATE GLASS DOWN Message

The TAILGATE GLASS DOWN message will be displayed on the driver information center (DIC) whenever rear wiper or rear defogger operation has been requested and the endgate window is open. The endgate window must be in the full up position in order for the rear wiper or rear defogger to operate.

SEE MANUAL - TAILGATE Message

The SEE MANUAL - TAILGATE message will be displayed on the driver information center (DIC) whenever the endgate window position needs to be relearned. Refer to .