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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof/Sunshade Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Because of the accessibility of the switches, perform the switch component testing before beginning the circuit/system testing.
  1. Ignition OFF, disconnect the harness connector at the K61 sunroof control module.
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, determine if the K61 sunroof control module is causing the fuse to open. Replace the K61 sunroof control module.
  4. Ignition ON, verify that a test lamp does not illuminate between the circuit terminals listed below and ground:
    • Terminal 3
    • Terminal 5
    • Terminal 6
    • If the test lamp does illuminate, test the appropriate circuit for a short to voltage.
  5. Ignition OFF, verify that a test lamp does not illuminate between the circuit terminals listed below and B+:
    • Terminal 3
    • Terminal 5
    • Terminal 6
    • If the test lamp does illuminate, test the appropriate circuit for a short to ground.
  6. Disconnect the harness connector at the S72 sunroof switch and the S88 sunroof tilt switch.
  7. Test for less than 10 Ω between the circuit terminals listed below:
    • S72 sunroof switch terminal 1 and K61 sunroof control module terminal 3
    • S72 sunroof switch terminal 4 and K61 sunroof control module terminal 5
    • S88 sunroof ventilation switch terminal 1 and K61 sunroof control module terminal 3
    • S88 sunroof ventilation switch terminal 4 and K61 sunroof control module terminal 6
    • If greater than the specified value, test the appropriate circuit for an open/high resistance.
  8. If all circuits test normal, test or replace the K61 sunroof control module.
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