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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Head-Up Display Malfunction >> Circuit/System Testing >> Inoperative Head-Up Display

Inoperative Head-Up Display

  1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P16 Instrument Cluster and P29 Head-Up Display. Ignition ON/Vehicle in Service Mode.
  2. Test for less than 1 V between the P16 Instrument Cluster harness connector X1 serial data circuit terminal 21 and ground.
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  3. Ignition OFF/Vehicle OFF.
  4. Test for infinite resistance between the P16 Instrument Cluster harness connector X1 serial data circuit terminal 21 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance
  5. Disconnect the harness connector at the S70R Steering Wheel Controls Switch - Right. Ignition ON/Vehicle in Service Mode.
  6. Test for less than 1 V between the S70R Steering Wheel Controls Switch - Right serial data circuit terminal 8 and ground.
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Ignition OFF/Vehicle OFF.
  8. Test for infinite resistance between the serial data circuit terminal 8 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  9. Replace the video cable between the P29 Head-Up Display and the P16 Instrument Cluster. Ignition ON/Vehicle in Service Mode.
  10. Verify a test pattern is displayed is displayed on the P29 Head-Up Display when performing the Head-Up Display Pattern Check on the scan tool.
    • If the test pattern is displayed 

      All OK.

    • If the test pattern is not displayed 
  11. Connect the harness connector at the P16 Instrument Cluster and S70R Steering Wheel Controls Switch - Right. Ignition ON/Vehicle in Service Mode.
  12. Verify steering wheel controls function properly.
    • If steering wheel controls function properly 

      Replace P29 Head-Up Display.

    • If steering wheel controls do not function properly 
  13. Ignition OFF/Vehicle OFF. Disconnect harness connector at the S70R Steering Wheel Controls Switch - Right. Connect the harness connector at the and P29 Head-Up Display. Ignition ON/Vehicle in Service Mode.
  14. Verify head-up display functions properly.
    • If head-up display functions properly 

      Replace S70R Steering Wheel Controls Switch - Right.

    • If head-up display does not function properly 
  15. Replace P16 Instrument Cluster.
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