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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Head-Up Display Malfunction >> Circuit/System Testing

Circuit/System Testing

HUD Inoperative

  1. Ignition OFF, disconnect the harness connector at the HUD switch.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 5 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
  3. Verify the scan tool Display Dimming parameter is greater than 98 percent.
    • If less than the specified range, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the HUD.
  4. Install a 3A fused jumper wire between the HUD signal circuit terminal 4 and the low reference circuit terminal 5. Verify the scan tool Display Dimming parameter is less than 2 percent.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
  5. If all circuits test normal, test or replace the HUD switch.

HUD Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the head-up display (HUD)/Dimmer switch.
  2. Test for less than 1.0 ohm between the low reference circuit terminal 5 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, verify that all of the scan tool HUD switch parameters are Inactive.
    • If not Inactive, test the signal circuit terminals listed below for a short to ground. If the circuit tests normal, replace the HUD.
    • Image Down Switch Signal Terminal 6
    • Image Up Switch Signal Terminal 7
  4. Install a 3A fused jumper wire between the HUD switch signal circuit terminals listed below and the low reference circuit terminal 5. Verify the scan tool Adjust Display Down Switch or Adjust Display Up Switch parameter is Active.
    • Image Down Switch Signal Terminal 6
    • Image Up Switch Signal Terminal 7
    • If not Active, test the switch signal circuit for an open/high resistance. If the circuit(s) test normal, replace the HUD.
  5. Verify the scan tool Display Dimming parameter is greater than 98 percent.
    • If less than the specified range, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the HUD.
  6. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 5. Verify the scan tool Display Dimming parameter is less than 2 percent.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
  7. If all circuits test normal, test or replace the HUD switch.
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