Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch. It may take up to 2 min for all vehicle systems to power down.
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.
- Go to next step: If less than 10 Ω
Ignition ON.
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.
- Go to next step: If Short to Battery
Install a 5 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 1.
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.
  - Go to next step: 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.
- Go to next step: If Short to Ground
All OK.