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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 Verification

Circuit/System Verification

  1. Ignition ON/Vehicle in Service Mode.
  2. 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 not displayed 

      Refer to Inoperative Head-Up display Circuit/System Testing.

    • Go to next step: If the test pattern is displayed 
  3. Verify the P29 Head-Up Display performs the following function with the S27 Head-Up Display Switch in the appropriate state:
    • DIM + Switch - Head-up display brightness increases
    • DIM - Switch - Head-up display brightness decreases
    • UP Switch - Head-up display image moves up
    • DOWN Switch - Head-up display image moves down
    • INFO Switch - Head-up display image changes pages
    • If the P29 Head-Up Display does not perform the expected function with the switch in the appropriate state 

      Refer to Inoperative Head-Up Display Switch Circuit/System Testing.

    • Go to next step: If the P29 Head-Up Display performs the expected function with the switch in the appropriate state 
  4. All OK.
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