Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
Test for at least 9.7 V between the ignition circuit terminal 12 and ground.
- If less than 9.7 V
1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the 12 V reference circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the 12 V reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify there is voltage at the fuse and the fuse is good.
- If 9.7 V or greater
Ignition OFF, connect the harness connector at the S70L Steering Wheel Controls Switch - Left, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
Test for less than 1 V between the signal circuit terminals listed below and ground:
- Terminal 4
- Terminal 16
- If 1 V or greater
  Repair the short to voltage on the signal circuit.
- If less than 1 V
Ignition OFF.
Test for infinite resistance between the signal circuit terminals listed below and ground:
- Terminal 4
- Terminal 16
- If less than infinite resistance
  Repair the short to ground on the signal circuit.
- If infinite resistance
Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
Test for less than 5 Ω between the circuit terminals listed below:
- S70L Steering Wheel Controls Switch - Left terminal 12 and K9 Body Control Module terminal 4.
- S70L Steering Wheel Controls Switch - Left terminal 10 and K9 Body Control Module terminal 16.
- If greater than 5 Ω
  Repair the open/high resistance in the circuit.
- If less than 5 Ω
Test or replace the S70L Steering Wheel Controls Switch - Left.