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Home >> Buick >> 2016 >> Cascada Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Sunroof System) >> Diagnostic Information and Procedures >> DTC B3664: Sunroof Position Select Switch High Signal Circuit >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. 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 S72 Sunroof 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 M69 Sunroof Motor.
    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 M69 Sunroof Motor.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Slide Switch parameter is Short to Battery.
    • If not Short to Battery 
    1. Ignition Off, disconnect the harness connector at the M69 Sunroof Motor.
    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 M69 Sunroof Motor.
    • 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 Slide Switch parameter is Short to Ground.
    • If not Short to Ground 
    1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
    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 M69 Sunroof Motor.
    • If Short to Ground 
  7. All OK.
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