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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B12A7 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.

B12A7 39

  1. Ignition ON.
  2. Verify DTC B12A7 39 is not set.
    • If DTC B12A7 39 is set 

      Replace the A33 Media Disc Player.

    • Go to next step: If DTC B12A7 39 is not set 
  3. All OK.

B12A7 45

  1. Ignition ON.
  2. Verify DTC B12A7 45 is not set.
    • If DTC B12A7 45 is set 
    1. Program the A33 Media Disc Player.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the A33 Media Disc Player.
      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If DTC B12A7 45 is not set 
  3. All OK.
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