Circuit / System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X3 harness connector at the X85 Steering Wheel Air Bag Coil. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the X85 Steering Wheel Air Bag Coil ground circuit terminal 5 and ground.
- If 10 Ω or greater
  1. 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, replace the A11 Radio.
- Go to next step: If less than 10 Ω
Ignition ON.
Test for 3 - 4 V between the signal circuits listed below and ground.
- X85 Steering Wheel Air Bag Coil - signal circuit terminal 2
- X85 Steering Wheel Air Bag Coil - signal circuit terminal 3
- If less than 3 V
  1. Ignition OFF, disconnect the harness connector at the A11 Radio.
  2. Test for infinite resistance between the signal 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 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 A11 Radio.
- If greater than 4 V
  1. Ignition OFF, disconnect the harness connector at the A11 Radio, 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, replace the A11 Radio.
- Go to next step: If between 3 - 4 V
Test or replace the S70L Steering Wheel Controls Switch - Left.