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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> Head Up Display (HUD) Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the head-up display (HUD).
  2. Test for less than 1.0 ohm of resistance between the ground circuit terminal 4 and ground.
    • If greater than the specified value, test the HUD ground circuit for an open/high resistance.
  3. Verify a test lamp illuminates when connected between the battery positive voltage circuit terminal 6 and ground.
    • If the test light does not illuminate, test the battery positive voltage circuit for an open/high resistance.
  4. If all circuits test normal, test or replace the HUD.
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