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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 212 (Sunroof) >> Diagnostic Information and Procedures >> Power Sunroof/Sunshade Malfunction >> Circuit/System Testing

Circuit/System Testing

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.

Power Sunroof Malfunction

  1. Ignition/vehicle OFF, disconnect the harness connector at the K61 Sunroof Control Module
  2. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2350 or ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON/vehicle in service mode, verify a test lamp illuminates between B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    1. Test circuit 3540 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • If an open/high resistance is not found, verify there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test circuit 3540 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K61 Sunroof Control Module
    • Go to next step: If the test lamp Illuminates 
  4. Replace the K61 Sunroof Control Module
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