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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> Head-Up Display Malfunction >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

Inoperative Head-Up Display

  1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P16 Instrument Panel Cluster Control Module and P29 Head-Up Display. Ignition ON/Vehicle in Service Mode.
  2. Test for less than 1 V between the P16 Instrument Panel Cluster Control Module harness connector X1 serial data circuit terminal 20 and ground.
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  3. Ignition OFF/Vehicle OFF.
  4. Test for infinite resistance between the P16 Instrument Panel Cluster Control Module harness connector X1 serial data circuit terminal 20 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
  5. Disconnect the harness connector at the S70R Radio Control Switch - Steering Wheel. Ignition ON/Vehicle in Service Mode.
  6. Test for less than 1 V between the S70R Radio Control Switch - Steering Wheel serial data circuit terminal 3 and ground.
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  7. Ignition OFF/Vehicle OFF.
  8. Test for infinite resistance between the serial data circuit terminal 3 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  9. Replace the video cable between the P29 Head-Up Display and the P16 Instrument Panel Cluster Control Module. 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.

    • Go to next step: If the test pattern is not displayed 
  11. Connect the harness connector at the P16 Instrument Panel Cluster Control Module and S70R Radio Control Switch - Steering Wheel. Ignition ON/Vehicle in Service Mode.
  12. Verify steering wheel controls function properly.
    • If steering wheel controls function properly 

      Replace the P29 Head-Up Display.

    • Go to next step: If steering wheel controls do not function properly 
  13. Ignition OFF/Vehicle OFF. Disconnect harness connector at the S70R Radio Control Switch - Steering Wheel. 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 the S70R Radio Control Switch - Steering Wheel.

    • Go to next step: If head-up display does not function properly 
  15. Replace the P16 Instrument Panel Cluster Control Module.

Inoperative Head-Up Display Switch

  1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S27 Head-Up Display Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P29 Head-Up Display.
    • Go to next step: If less than 10 Ω 
  3. Test for 4.8 - 5.2 V between the signal circuit terminal 4 and ground.
    • If less than 4.8 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P29 Head-Up Display.
    • If greater than 5.2 V 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the P29 Head-Up Display.
    • Go to next step: If between 4.8 - 5.2 V 
  4. Test for 3.7K - 3.9K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side).
    • If not between 3.7K - 3.9K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 3.7K - 3.9K Ω 
  5. Test for 1K - 1.2K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the HUD DOWN Switch pressed.
    • If not between 1K - 1.2K Ω 

      Replace the S27 Head-Up Display switch.

    • Go to next step: If between 1K - 1.2K Ω 
  6. Test for 0.55K - 0.75K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the HUD UP Switch pressed.
    • If not between 0.55K - 0.75K Ω 

      Replace the S27 Head-Up Display switch.

    • Go to next step: If between 0.55K - 0.75K Ω 
  7. Test for 1.8K - 2.0K Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the INFO/PAGE Switch pressed.
    • If not between 1.8K - 2.0K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 1.8K - 2.0K Ω 
  8. Test for 95 - 115 Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the Brightness + Switch pressed.
    • If not between 1.3K - 1.6K Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 1.3K - 1.6K Ω 
  9. Test for 310 - 350 Ω between the signal terminal 4 @ S27 Head-Up Display Switch (component side) and the low reference terminal 3 @ S27 Head-Up Display Switch (component side) with the Brightness - Switch pressed.
    • If not between 310 - 350 Ω 

      Replace the S27 Head-Up Display Switch.

    • Go to next step: If between 310 - 350 Ω 
  10. Replace the P29 Head-Up Display.
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