LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2008 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> 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 dimming/head-up display (HUD) switch.
  2. Test for less than 1 ohm of resistance between the HUD switch ground circuit terminal 1 and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Adjust Display Down Switch or the Adjust Display Up Switch parameter in the HUD Data List is Inactive.
    • If any is not Inactive, test the appropriate HUD image switch signal circuit terminals 3 or 2 for a short to ground. If the circuits test normal, replace the HUD.
  4. Install a 3A fused jumper wire between the HUD image down switch signal circuit terminal 3 or the image up switch signal circuit terminal 2 and the ground circuit terminal 1. Verify the scan tool Adjust Display Down Switch or Adjust Display Up Switch parameter is Active.
    • If any is not Active, test the appropriate HUD image switch signal circuit terminals 3 or 2 for a short to voltage or an open/high resistance. If the circuits tests normal, replace the HUD.
  5. If all circuits test normal, test or replace the dimmer/HUD switch.
scientia non olet · About LEMON Manuals