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Home >> Buick >> 2019 >> Regal Base >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Wheel And Column >> Diagnostic Information and Procedures >> Heated Steering Wheel Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X229 @ K32 Steering Wheel Heating Control Module
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 5 & Ground
    • If 10 ohms or greater 
    1. Ignition/Vehicle - Off
    2. Test for less than 2 ohms between the test points: Ground circuit & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points: Ignition circuit terminal 3 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: Ignition circuit & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.Refer to: Power Mode Mismatch .
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off
    2. Test for infinite resistance between the test points: Ignition circuit & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If less than infinite resistance - Replace the component: K32 Steering Wheel Heating Control Module
    • Go to next step: If the test lamp turns On 
  6. Ignition/Vehicle - Off
  7. Connect the electrical connector: X229 @ K32 Steering Wheel Heating Control Module
  8. Disconnect the electrical connector: S70L Steering Wheel Controls Switch - Left
  9. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Ignition/Vehicle - Off
    2. Test for less than 2 ohms between the test points: Ground circuit & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  10. Ignition - On / Vehicle - In Service Mode
  11. Test for battery voltage between the test points: Signal circuit terminal 8 & Ground
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X229 @ K32 Steering Wheel Heating Control Module
    3. Test for infinite resistance between the test points: Control Circuit & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control Circuit & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K32 Steering Wheel Heating Control Module
    • Go to next step: If battery voltage 
  12. Test for infinite resistance between the test points: S70L Steering Wheel Controls Switch - Left - Signal terminal 8 & Ground terminal 1 - Heated Steering Wheel Switch - Released
    • If less than infinite resistance 

      Replace the component: S70L Steering Wheel Controls Switch - Left

    • Go to next step: If infinite resistance 
  13. Test for less than 40 ohms between the test points: S70L Steering Wheel Controls Switch - Left - Signal terminal 8 & Ground terminal 1 - Heated Steering Wheel Switch - Pressed
    • If 40 ohms or greater 

      Replace the component: S70L Steering Wheel Controls Switch - Left

    • Go to next step: If less than 40 ohms 
  14. Connect the electrical connector: S70L Steering Wheel Controls Switch - Left
  15. Disconnect the electrical connector: E15 Steering Wheel Heater
  16. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 1 & Ground
    • Ground circuit terminal 4 & Ground
    • If 10 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 10 ohms 
  17. Test for 1.5 to 3.0 ohms between the test points: Control circuit terminal 3 & Ground circuit terminal 4
    • If not between 1.5 and 3.0 ohms 

      Replace the component: E15 Steering Wheel Heater

    • Go to next step: If between 1.5 and 3.0 ohms 
  18. Test for 9 k to 12 kohms between the test points: Signal circuit terminal 2 & Ground circuit terminal 1
    • If not between 9 k and 12 kohms 

      Replace the component: E15 Steering Wheel Heater

    • Go to next step: If between 9 k and 12 kohms 
  19. Replace the component: K32 Steering Wheel Heating Control Module
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