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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K61 Sunroof Control Module. 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 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
    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 1 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 K61 Sunroof Control Module.
    • 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 - K61 Sunroof Control Module
    • Terminal 5 - K61 Sunroof Control Module
    • Terminal 6 - K61 Sunroof Control Module
    • 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 - K61 Sunroof Control Module
    • Terminal 5 - K61 Sunroof Control Module
    • Terminal 6 - K61 Sunroof Control Module
    • 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 and the S88 Sunroof Tilt Switch.
  9. Test for less than 5 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 Tilt Switch terminal 1 and K61 Sunroof Control Module terminal 3
    • S88 Sunroof Tilt Switch terminal 4 and K61 Sunroof Control Module terminal 6
    • If greater than 5 Ω 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  10. Test or replace the K61 Sunroof Control Module.

Tilt Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω , test or replace the K61 Sunroof Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Sunroof Tilt Switch parameter is Short to Battery.
    • If not Short to Battery 
    1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
    2. Test for infinite resistance between the signal circuit terminal 4 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K61 Sunroof Control Module.
    • If Short to Battery 
  5. Install a 5 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 1.
  6. Verify the scan tool Sunroof Tilt Switch parameter is Short to Ground.
    • If not Short to Ground 
    1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
    2. Test for less than 1 V between the signal circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K61 Sunroof Control Module.
    • If Short to Ground 
  7. All OK.
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