Circuit/System Testing

Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S126 Drive Mode Select 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.
Verify the scan tool BCM Drive Mode Select Switch parameter displays Inactive.
- If the parameter does not display Inactive
1. Vehicle OFF, disconnect the X6 harness connector at the K9 BCM.
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 BCM.
- If the parameter displays Inactive
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 4.
Verify the scan tool BCM Drive Mode Select Switch parameter displays Active.
- If the parameter does not display Active
1. Vehicle OFF, remove the jumper wire, disconnect the X6 harness connector at the K9 BCM.
2. 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 BCM.
- If the parameter displays Active
Test or replace the S126 Drive Mode Select Switch.