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Home >> GMC >> 2021 >> Acadia SL >> 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 / Vehicle - In Service Mode
  2. Perform the scan tool function: Head-Up Display Pattern Check
  3. Verify the component activates: P29 Head-Up Display
    • If not the specified state 

      Refer to Circuit/System Testing - Head-Up Display = Inoperative

    • Go to next step: If the specified state 
  4. Press the following button: S27 Head-Up Display Switch - All

    Verify the scan tool parameter: Head-Up Display Switch = Displays each of the specified states.

    • If not the specified state 

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

    • Go to next step: If the specified state 
  5. Press the following button: S27 Head-Up Display Switch - All

    Verify the component activates: P29 Head-Up Display

    • If not the specified state 

      Test or replace the component: P29 Head-Up Display

    • Go to next step: If the specified state 
  6. All OK.
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