GM Service Manual Online
For 1990-2009 cars only

Power Sunroof System Components

The power sunroof system is a tilt/slide style, consisting of the following components:

    • Sunroof actuator, control module included
    • Sunroof switch
    • Sunroof window
    • Sunshade
    • The rail and track assembly upon which the sunroof window rides
    • Power supply for the sunroof actuator motor and retained accessory power (RAP) relay: SUNROOF 25 A fuse
    • Ground G203

Power Sunroof Operation

The power sunroof will operate with the ignition switch turned to Accessory or RUN. Once the ignition switch is turned to OFF, from RUN, the sunroof will continue to operate until any door is open or when the retained accessory power (RAP) has timed out. For a complete description of the RAP operation, refer to Retained Accessory Power (RAP) Description and Operation.

Use the rocker type sunroof switch to command the sunroof to :

    • Open
    • Closed
    • Vent

Pressing the sunroof switch rearward, the sunroof window will slide from:

    • Vent position to the closed position
    • Closed position to the open position

Pressing the sunroof switch forward, the sunroof window will slide from:

    • Open position to the closed position
    • Closed position to the vent position

To Slide Open

The slide open function will work when the sunroof window is in the closed or partially open position. To slide open the power sunroof, press and hold the sunroof switch rearward. This will apply an input to the sunroof actuator motor from the sunroof switch open contacts through the sunroof switch open signal circuit. The constant input, allows the sunroof actuator motor to control the opening of the sunroof window. From the closed position the sunroof window will lower slightly, then slide open, rearward, with the sunroof sunshade between the roof and the headliner, stopping at the comfort stop position.

From the comfort stop position, an open request will slide the sunroof window approximately 2.54 cm (1 in) further open. The next open request will slide the sunroof window completely to the full open position.

To Close

To close the power sunroof from the:

    • Open position--press and hold the sunroof switch forward. This will apply an input to the sunroof actuator motor from the sunroof switch close contacts through the sunroof switch close signal circuit. The sunroof switch close input at the sunroof actuator motor needs to be constant, switch pressed, allowing the sunroof actuator motor to control the motor to drive the sunroof window forward, until it reaches the closed position. To close the sunshade, this will have to be manually slid closed.
    • Vent position--press and hold the sunroof switch rearward. This will apply an input to the sunroof actuator motor from the sunroof switch open contacts through the sunroof switch circuit. The sunroof switch open input to the sunroof actuator motor needs to be constant, switch pressed, to allow the motor to tilt the sunroof window down to the fully closed position.

To Vent Open

To open the power sunroof to the vent position from the closed position, press and hold the sunroof switch forward. This will apply an input to the sunroof actuator motor from the sunroof switch close contacts through the sunroof switch close signal circuit. The sunroof switch close input to the sunroof actuator motor needs be constant, switch pressed, to allow the sunroof actuator motor to control the motor to tilt the rear of the sunroof window upward to the vent position.

Limit Switches

The limit switches are within the sunroof actuator motor and supply data. The multiple data combinations allow the sunroof actuator motor to track the position of the sunroof window.

Sunroof Actuator Motor

The sunroof actuator motor contains the logic and is serviceable as one unit.