LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 340 (Power Door Lock System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC B19C7 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  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.
scientia non olet · About LEMON Manuals