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.

Ignition OFF, disconnect the harness connector at the S126 Drive Mode Select Switch.
Test for less than 10 Ω between the ground circuit terminal 9 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω at 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
Ignition ON, verify with a scan tool the Engine control Module Stop/Start Select Switch parameter is No.
- If the parameter is YES
Verify the scan tool Stop/Start Select Switch parameter is Inactive.
- If not Inactive
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 7 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K9 Body Control Module.
- If Inactive
Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
Verify the scan tool Stop/Start Select Switch parameter is Active.
- If not Active
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Ignition OFF.
4. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance on the circuit.
  - If less than 2 Ω, replace the K9 Body Control Module.
- If Active
Test or replace the S126 Drive Mode Select Switch.