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Home >> GMC >> 2007 >> Acadia SLT, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Head Up Display (HUD) Intensity Does Not Vary >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the HUD module.
  2. Connect a test lamp between the battery positive voltage circuit and the dimmer switch display signal circuit.
  3. Ignition ON, verify that a test lamp illuminates and changes intensity when the dimmer switch is adjusted from low to high intensity.
    • If the test lamp does not vary in intensity, test the dimmer switch display signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD switch.
  4. If all circuits test normal, test or replace the HUD module.
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