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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 >> DTC B1A4C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  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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