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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 212 (Sunroof) >> Diagnostic Information and Procedures >> Power Sunroof/Sunshade Malfunction >> 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 U0169 or U1121 are not set.
    • Go to next step: If DTC U0169 or U1121 are not set 
  3. Verify the K9 Body Control Module scan tool Sunroof Switch parameter changes from Inactive to Close, Open, Stop, Vent when pressing the Sunroof Switch.
    • If the parameters do not change 

      Replace the A103 Roof Console.

    • Go to next step: If the parameters change 
  4. Command the sunroof to open and close by pressing the appropriate switch on the A103 Roof Console.
    • If the sunroof does not open or close 

      Refer to Circuit/System Testing.

    • Go to next step: If the sunroof opens and closes 
  5. All OK.
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