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Home >> Cadillac >> 2006 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> Head Up Display (HUD) Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. With the ignition ON, turn the HUD dimmer up switch to the full intensity.
    • If the HUD display turns on normally, check for intermittent and poor connection at the harness connector of the HUD.
  2. With the ignition OFF, disconnect the HUD.
  3. Connect a test lamp between the HUD battery positive voltage and a good ground.
  4. Turn the ignition ON, with the engine OFF.
    • If the test lamp does not illuminate, check the HUD battery positive voltage for an open or a high resistance.
  5. Connect a test lamp between the HUD battery positive voltage and the HUD ground circuit.
    • If the test lamp does not illuminate, check the HUD ground circuit for an open or a high resistance.
  6. With the ignition turned OFF, disconnect the HUD switch.
  7. Connect a test lamp between the HUD switch ground circuit and the HUD battery positive voltage circuit.
  8. Turn the ignition ON, with the engine OFF.
    • If the test lamp does not illuminate, check the HUD switch ground circuit for an open or a high resistance.
  9. Connect a test lamp between the HUD dimmer up switch signal circuit and the HUD battery positive voltage circuit while the HUD dimmer up switch is active.
  10. Turn the ignition ON, with the engine OFF.
    • If the test lamp illuminates, replace the HUD.
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