Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S126 Drive Mode Switch. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 4 and ground
- If 10 Ω or greater
1. Vehicle 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
Vehicle ON.
Test for 12V between the signal circuit terminal 1 and ground.
- If not 12V
1. Vehicle OFF, disconnect the harness connector at the K9 X6 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 22 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 12V
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 4.
Verify the Drive Mode Status changes state.
- If the Drive Mode Status does not change state
1. Vehicle OFF, disconnect the harness connector at the K9 X6 Body Control Module, Vehicle 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. 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 K9 Body Control Module.
- If Drive Mode Status does change state
Test or replace the S126 Drive Mode Switch.