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Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Head Up Display (HUD) Image Adjustment Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the head-up display (HUD)/Dimmer switch.
  2. Test for less than 1.0 ohm of resistance between the HUD switch ground circuit and ground.
    • If greater than 1.0 ohm, test the HUD switch ground circuit for an open/high resistance.
  3. Install a 3-A fused jumper wire between the image down switch signal circuit or the image up switch signal circuit and the low reference circuit. Verify the scan tool Adjust Display Down Switch or the Adjust Display Up Switch parameter is Active.
    • If not Active, test the image down switch signal circuit or the image up switch signal circuit and the switch low reference circuit for an open/high resistance. If the circuits test normal, replace the HUD.
  4. If all circuits test normal, test or replace the HUD switch.
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