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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Steering Wheel And Steering Column >> Diagnostic Information and Procedures >> Heated Steering Wheel Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the X85 Steering Wheel Airbag Coil.
  2. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 9 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • Go to next step: If 2 Ω or greater
    3. Verify the in-line fuse is OK and there is voltage at the fuse.
      • If the in-line fuse is open, replace the K32 Steering Wheel Heating Control Module.
      • If the in-line fuse is OK, repair the open/high resistance in the circuit.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K32 Steering Wheel Heating Control Module.
    • Go to next step: If the test lamp illuminates 
  5. Ignition OFF, connect the X2 harness connector at the X85 Steering Wheel Airbag Coil. Disconnect the harness connector at the S70A Steering Wheel Control Switch - Left Lower. Ignition ON.
  6. Test for B+ between the control circuit terminal 4 and ground.
    • If less than B+ 
    1. Ignition OFF, disconnect the harness connector at the S70D Steering Wheel Control Switch - Right Upper.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the S70D Steering Wheel Control Switch - Right Upper.
    • Go to next step: If B+ 
  7. Ignition OFF, connect the harness connector at the S70A Steering Wheel Control Switch - Left Lower. Disconnect the in-line harness connector at the K32 Steering Wheel Heating Control Module.
    8. NOTE:

    Verify the instrument panel dimming control is set to bright.

  8. Install a 3 A fused jumper wire between the control circuit terminal 2 and ground. Ignition ON.
  9. Verify the steering wheel heat indicator is illuminated.
    • If the steering wheel heat indicator does not illuminate 

      Replace the S70A Steering Wheel Control Switch - Left Lower

    • Go to next step: If the steering wheel heat indicator illuminates 
  10. Replace the K32 Steering Wheel Heating Control Module.
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