GM Service Manual Online
For 1990-2009 cars only

The instrument cluster head-up display (HUD) system projects frequently used driver information off the windshield and is viewed near the front of the vehicle from the driver's seat. The information may be displayed in English or Metric units by selecting the E/M button. There are five different HUD display modes. Press and hold the PAGE button on the LH switch assembly to select any of the following display modes:

    • Speed only
    • Speed and Gage
    • Speed, Tach and Gage
    • Speed and Tach
    • Tachometer only

While a minor gage is displayed, a quick tap of the PAGE button will allow you to select one of the following minor gage display modes:

    • Oil Pressure
    • Coolant Temperature
    • Fuel

There are four major components to the HUD system.

    • Head-Up Display Unit
    • Instrument Panel Cluster (IPC)
    • HUD Control Switch
    • Windshield (labeled SHADED HUD lower right side)

The HUD image can be moved up or down to center it to your seated height by pressing the DISPLAY UP or DOWN button. The HUD system also contains a forward facing ambient light sensor which allows the HUD display image to adapt to brightness levels of the environment. The ambient light sensor is integrated within the HUD unit and is not serviced separately. When ambient light levels are low (at night), the HUD image brightness can be manually adjusted by rotating the dimmer switch located on the LH switch assembly. The HUD image can be completely turned OFF by rotating the dimmer switch in the full clockwise position. The HUD system will only display the information that was sent by the IPC and cannot determine if the information is valid. The HUD system performs a self test when the ignition is first turned ON. The HUD system will illuminate all segments of display for 3.5  seconds. After the displays are projected for 3.5 seconds, the HUD system will begin normal operation. Diagnosis of the HUD system must always begin with verifying proper IPC operation prior to diagnosing any HUD malfunctions.