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Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Wheel And Column >> Diagnostic Information and Procedures >> Heated Steering Wheel Malfunction >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition ON.
  2. Verify that DTC U152B is not set.
    • Go to next step: If the DTC is not set 
  3. Ignition OFF, disconnect the X5 in-line harness connector at the X85 Steering Wheel Air Bag Coil.
  4. Test for less than 10 Ω between the ground circuit terminal 2 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 
  5. Ignition ON.
  6. Verify a test lamp illuminates between the ignition voltage circuit terminal 1 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.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
      • 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 blown, 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 
  7. Ignition OFF, connect the in-line harness connector X5 at the X85 Steering Wheel Air Bag Coil. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  8. Test for less than 10 Ω between the ground circuit terminal 6 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 
  9. Ignition ON.
  10. Test for B+ between the signal circuit terminal 11 and ground.
    • If less than B+ 
    1. Ignition OFF, disconnect the in-line harness connector at the S70L Steering Wheel Controls Switch - Left.
    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 K32 Steering Wheel Heating Control Module.
    • Go to next step: If B+ 
  11. Ignition OFF, disconnect the in-line harness connector at the K32 Heated Steering Wheel Control Module.
  12. Ignition ON.
  13. Test for less than 1 V between the signal circuit terminal 1 and ground.
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  14. Ignition OFF, connect the in-line harness connector at the K32 Heated Steering Wheel Control Module.
  15. Place the S70L Steering Wheel Controls Switch - Left in the OFF position.
  16. Test for infinite resistance between terminal 11 and terminal 6 at the S70L Steering Wheel Controls Switch - Left.
    • If less than infinite resistance 

      Replace the S70L Steering Wheel Controls Switch - Left.

    • Go to next step: If infinite resistance 
  17. Place the S70L Steering Wheel Controls Switch - Left in the ON position.
  18. Test for less than 40 Ω between terminal 11 and terminal 6.
    • If 40 Ω or greater 

      Replace the S70L Steering Wheel Controls Switch - Left

    • Go to next step: If less than 40 Ω 
  19. Disconnect the in-line harness connector at the E15 Steering Wheel Heater.
  20. Test for less than 10 Ω between the ground circuit terminal A at the K32 Steering Wheel Heating Control Module and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 10 Ω 
  21. Test for 1.5 - 3.0 Ω between the signal terminal B and the ground terminal A at the E15 Steering Wheel Heater.
    • If not within the specified range 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If within the specified range 
  22. Test for 9 - 11k Ω between the control circuit terminal C and the ground terminal D on the E15 Steering Wheel Heater.
    • If not within the specified range 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If within the specified range 
  23. Replace the K32 Steering Wheel Heating Control Module.
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