GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to RUN.
  2. Place the HUD dim switch to maximum intensity.

The HUD speedometer displays a zero and displays either the km/h or MPH indicator.

HUD System Inoperative

2

Move the HUD dim switch from maximum to minimum intensity.

The HUD image intensity dims.

HUD Dim Switch does not Vary the HUD Image Intensity

3

  1. Move the HUD dim switch to maximum intensity.
  2. Use the HUD up/down switch in order to move the HUD image up and down.

The HUD image moves up and down on the windshield.

HUD Dim Switch does not Move Up or Down

4

  1. Start the engine.
  2. Drive the vehicle.

The HUD speedometer displays approximately the same speed as the instrument cluster.

HUD Speedometer Inoperative

5

Press the ENG/MET switch.

The HUD speedometer and units (MPH or km/h) indicator change between English and metric.

HUD Speedometer and Units (MPH or km/h) Indicator do not Change between English and Metric

6

  1. Turn on the hazard flashers switch.
  2. Turn on the headlights.
  3. Place the headlamp dimmer switch in HIGH.
    • The left turn signal and right turn signal indicators flash.
    • The high beam indicator is on.

HUD LH Turn Signal, Right Turn Signal and the High Beam Indicators are Inoperative

7

  1. Use the IP dimming switch in order to vary the intensity of the instrument cluster display.
  2. Turn off the headlights.
  3. Move the HUD dim switch to the minimum intensity (OFF).

The interior dimming switch varies the HUD image intensity with the headlights on.

    • The IP Dimming Switch does not Vary the HUD Image Intensity with the Headlights On
    • HUD System Always On

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.