GM Service Manual Online
For 1990-2009 cars only

The head-up display (HUD) system consists of the following components:

    • The HUD module
    • The HUD switch
    • The instrument cluster
    • The powertrain control module (PCM)

The HUD module uses various inputs from these components in order to display the following information:

    • A digital speedometer
    • A MPH or km/h indicator
    • The turn signal indicators
    • The high beam indicator
    • The CHECK GAUGES message

The HUD module has inputs from the HUD switch in order to control the HUD image location and brightness.