GM Service Manual Online
For 1990-2009 cars only

Important: For optimal cluster performance, use an instrument cluster HUD specific windshield. The instrument cluster head-up display (HUD) system projects the frequently used driver information near the front of the vehicle as viewed from the driver's seat. The instrument cluster HUD system displays the following information during vehicle operation:

    • The digital speedometer operating in MPH or km/h
    • The turn indicators
    • The high-beam indicators
    • The low fuel indicator
    • The check gauge indicator

The instrument cluster HUD system consists of the following components:

    • The instrument cluster HUD specific windshield
    • The instrument cluster HUD
    • The instrument cluster HUD dimmer switch

The instrument cluster HUD and the instrument cluster HUD dimmer switch are both connected to the instrument panel wiring harness.

The instrument cluster HUD dimmer switch performs the following functions:

    • Provides power to the instrument cluster HUD
    • Varies the intensity of the display image
    • Controls the motor driven mirror
    • Varies the height of the display image

The instrument cluster HUD dimmer switch is back-lit. The dimmer control on the headlight switch controls the intensity of the back lighting. The headlight switch and the instrument cluster HUD control the night brightness of the display image. The instrument cluster HUD will dim when the headlight switch is in the PARK position or the HEAD position.

The instrument cluster HUD performs a self-test upon the initial activation. If the instrument cluster HUD dimmer switch is in the ON position when the ignition switch is turned to the RUN position, the HUD will project the following displays for 3.5 seconds:

    • The turn indicators
    • The high-beam indicator
    • The low fuel indicator
    • The check gauge indicator
    • The km/h indicator
    • The MPH indicator
    • All of the segments of the digital speedometer

After the displays are projected for 3.5 seconds, the instrument cluster HUD begins normal operation.

The instrument cluster HUD performs a self-test when the instrument cluster HUD dimmer switch is moved out of the OFF position after the ignition switch is turned to the RUN position.