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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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 and all vehicle systems OFF, disconnect the harness connector at the M69 Sunroof Motor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Verify a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M69 Sunroof Motor.
    • If the test lamp illuminates 
  4. Ignition ON.
  5. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • Terminal 3 - M69 Sunroof Motor
    • Terminal 4 - M69 Sunroof Motor
    • Terminal 8 - M69 Sunroof Motor
    • If 1 V or greater 

      Repair the short to voltage on the signal circuit.

    • If less than 1 V 
  6. Ignition OFF.
  7. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • Terminal 3 - M69 Sunroof Motor
    • Terminal 4 - M69 Sunroof Motor
    • Terminal 8 - M69 Sunroof Motor
    • If less than infinite resistance 

      Repair the short to ground on the signal circuit

    • If infinite resistance 
  8. Disconnect the harness connector at the S72 Sunroof Switch.
  9. Test for less than 5 Ω between the circuit terminals listed below:
    • S72 Sunroof Switch terminal 5 and M69 Sunroof Motor terminal 3
    • S72 Sunroof Switch terminal 4 and M69 Sunroof Motor terminal 4
    • S72 Sunroof Switch terminal 2 and M69 Sunroof Motor terminal 8
    • If greater than 5 Ω 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  10. Test or replace the M69 Sunroof Motor.
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