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Home › Cadillac › 2021 › CT5 V, 4WD › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Vehicle Access System › Diagnostic Information and Procedures › DTC B19C7 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X8 harness connector at the K9 Body Control Module.
  2. Test for less than 1 V between the signal circuit terminal 15 and ground
    • If 1 V or greater 

      Replace the signal circuit

    • Go to next step: If less than 1 V 
  3. Test for less than 1 V between the signal circuit terminal 19 and ground
    • If 1 V or greater 

      Replace the signal circuit

    • Go to next step: If less than 1 V 
  4. Test for infinite resistance between the signal circuit terminal 19 and ground.
    • If not the specified value 

      Replace the signal circuit

    • Go to next step: If infinite resistance 
  5. Test for infinite resistance between the signal circuit terminal 15 and ground.
    • If not the specified value 

      Replace the signal circuit

    • Go to next step: If infinite resistance 
  6. Test for less than 1 Ω between signal circuit terminal 15 and the signal circuit terminal 19.
    • If 1 Ω or greater 

      Replace the signal circuit

    • Go to next step: If less than 1 Ω 
  7. If all circuits test normal, replace the K9 Body Control Module.
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