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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 212 (Sunroof) >> Diagnostic Information and Procedures >> DTC B19D9 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, Vehicle in Service Mode.
  2. Verify DTC B19D9 54 or DTC B19D9 55 is not set.
    • If DTC B19D9 54 or DTC B19D9 55 is set 
    1. Calibrate the K61 Sunroof Control Module. Refer to K61 Sunroof Control Module: Programming and Setup .
    2. Verify DTC B19D9 54 or DTC B19D9 55 does not set while operating the sunroof.
      • If DTC B19D9 54 or DTC B19D9 55 sets 

        Replace the K61 Sunroof Control Module.

      • Go to next step: If DTC B19D9 54 or DTC B19D9 55 does not set 
    3. All OK.
    • Go to next step: If DTC B19D9 54 or DTC B19D9 55 is not set 
  3. Verify DTC B19D9 49 is not set
    • If DTC B19D9 49 is set 

      Replace the K61 Sunroof Control Module.

    • Go to next step: If DTC B19D9 49 is not set 
  4. All OK.
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