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Home >> Buick >> 2022 >> Envision Preferred, AWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Wheel And Column >> Diagnostic Information and Procedures >> DTC B1A4C >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 connector at the K32 Heated Steering Wheel Module, ignition ON.
    2. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  2. Test for less than 1 V between control circuit terminal 1 and ground.
    • If 1 V or greater 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If less than 1 V 
    3. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  3. Test for less than 1 V between voltage reference circuit terminal 4 and ground.
    • If 1 V or greater 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If less than 1 V 
  4. Ignition OFF.
    5. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  5. Test for infinite resistance between control circuit terminal 1 and ground.
    • If less than infinite resistance 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If infinite resistance 
    6. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  6. Test for infinite resistance between voltage reference circuit terminal 4 and ground.
    • If less than infinite resistance 

      Replace the E15 Steering Wheel Heater.

    7. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  7. Test for 1.5 - 3.0 Ω between control circuit terminal 1 and control circuit terminal 2.
    • If not within the specified range 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If within the specified range 
    8. NOTE:

    The following test is performed on the E15 Steering Wheel Heater side of the connector.

  8. Test for 9 - 11k Ω between 12 V reference terminal 4 and signal circuit terminal 3.
    • If not within the specified range 

      Replace the E15 Steering Wheel Heater.

    • Go to next step: If within the specified range 
  9. Replace the K32 Heated Steering Wheel Module.
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