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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) Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the HUD module.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between both HUD grounds and ground.
    • If greater than 1.0 ohm, test the ground circuits for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit and ground.
    • If the test lamp does not illuminate, repair the battery positive voltage circuit for a short to ground or an open/high resistance.
  4. Ignition ON, dimmer switch at the high intensity position, verify that a test lamp illuminates between the battery positive voltage circuit and the dimmer switch display signal circuit.
    • If the test lamp does not illuminate, test the dimmer switch display signal circuit and the dimmer switch ground circuit for an open/high resistance. If the circuits test normal, replace the HUD switch.
  5. Ignition ON, dimmer switch at the off position, verify that a test lamp does not illuminate between the battery positive voltage circuit and the dimmer switch display signal circuit.
    • If the test lamp does illuminate, test the dimmer switch display signal circuit for a short to ground. If the circuits test normal, replace the HUD switch.
  6. If all circuits test normal, test or replace the HUD module.
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