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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Steering Wheel And Column) >> Diagnostic Information and Procedures >> Heated Steering Wheel Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 harness connector at the K32 Heated Steering Wheel Module.
  2. Test for less than 10 Ω between the ground circuits listed below and ground.
    • Terminal 4
    • Terminal 5
    • 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 B+ voltage circuit terminal 3 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 B+ voltage 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 Heated Steering Wheel 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 B+ voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K32 Heated Steering Wheel Module.
    • Go to next step: If the test lamp illuminates 
  5. Ignition OFF, connect the X1 harness connector. Disconnect the harness connector at the S70L Cruise Control Switch. Ignition ON.
  6. Verify a test lamp illuminates between the signal voltage circuit terminal 9 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the S70R Radio Control Switch - Steering Wheel.
    2. Test for infinite resistance between the signal 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 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 S70R Radio Control Switch - Steering Wheel.
    • Go to next step: If the test lamp illuminates 
  7. Test for less than 1 V between the control circuit terminal 7 and ground.
    • If greater than 1 V 
    1. Disconnect the X1 harness connector at the K32 Heated Steering Wheel Module.
    2. Test for less than 1 V between the control circuit terminal 2 and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Replace the K32 Heated Steering Wheel Module.
    • Go to next step: If infinite resistance 
  8. Ignition OFF.
  9. Test for infinite resistance between the control circuit terminal 7 and ground.
    • If less than infinite resistance 
    1. Disconnect the X1 harness connector at the K32 Heated Steering Wheel Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Replace the K32 Heated Steering Wheel Module.
    • Go to next step: If infinite resistance 
  10. Install a 3 A fused jumper wire between the control circuit terminal 7 and ground. Ignition ON.
  11. Verify the steering wheel heat indicator is illuminated.
    • If the steering wheel heat indicator does not illuminate 
    1. Disconnect the X1 harness connector at the K32 Heated Steering Wheel Module.
    2. 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.
      • Replace the S70L Cruise Control Switch
    • Go to next step: If the steering wheel heat indicator illuminates 
  12. Replace the K32 Heated Steering Wheel Module.
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