LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> DTC B12AC >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. While holding each switch listed below, verify the scan tool Head-Up Display Switch parameter is as follows:
    • DIM + Switch - HUD Dimming Up/Down Pressed
    • DIM - Switch - HUD Dimming Up/Down Pressed
    • UP Switch - HUD Movement
    • DOWN Switch - HUD Movement
    • PAGE Switch - HUD Page Switch
    • If the scan tool parameter does not equal the expected result with the switch in the appropriate state 

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

    • Go to next step: If the scan tool parameter equals the expected result with the switch in the appropriate state 
  3. Verify the P29 Head-Up Display performs the following function with the 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
    • PAGE 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 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.
scientia non olet · About LEMON Manuals