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Forward Collision Alert Switch Malfunction

WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
  2. Test for at least 9.7 V between the ignition circuit terminal 1 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 
  3. 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.
  4. 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 
  5. Ignition OFF.
  6. 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 
  7. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  8. Test for less than 5 Ω between the circuit terminals listed below:
    • S70L Steering Wheel Controls Switch - Left terminal 1 and K9 Body Control Module terminal 4.
    • S70L Steering Wheel Controls Switch - Left terminal 2 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 
  9. Test or replace the S70L Steering Wheel Controls Switch - Left.
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