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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 345 (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 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Because of the accessibility of the sunroof switch, perform the component testing before beginning the Circuit/System Testing.

Sunroof Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48 Multifunction Switch-Overhead Console. 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 20 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K62 Sunroof Sunshade Motor 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 K62 Sunroof Sunshade Motor Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.5-5.5 V between the 5 V reference circuit terminal 9 and ground.
    • If less than 4.5 V 
    1. Ignition OFF, disconnect the harness connector at the K62 Sunroof Sunshade Motor Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K62 Sunroof Sunshade Motor Module.
    • If greater than 5.5 V 
    1. Ignition OFF, disconnect the harness connector at the K62 Sunroof Sunshade Motor Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K62 Sunroof Sunshade Motor Module.
    • If between 4.5-5.5 V 
  5. Test or replace the S48 Multifunction Switch-Overhead Console.

Power Sunroof Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K62 Sunroof Sunshade Motor 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 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    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. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the 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 K62 Sunroof Sunshade Motor Module.
    • If the test lamp illuminates 
  5. Test for less than 1 V between the signal circuit terminal 5 and ground.
    • 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 terminal 5 and ground:
    • If less than infinite resistance 

      Repair the short to ground on the signal circuit

    • If infinite resistance 
  8. Disconnect the harness connector at the K62 Sunroof Sunshade Motor Module.
  9. Test for less than 5 Ω between the circuit terminals listed below:
    • S48 Multifunction Switch-Overhead Console terminal 9 and K62 Sunroof Sunshade Motor Module terminal 5
    • If greater than 5 Ω 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  10. Replace the K62 Sunroof Sunshade Motor Module.
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