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Home >> Cadillac >> 2015 >> XTS Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> DTC B3930: Child Security Lock Motors Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the X50A Fuse Block-Underhood. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 71 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block-Underhood. Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  4. Verify that a test lamp does not illuminate between the control circuit terminal 16 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 16 X5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block-Underhood.
    • If the test lamp is not illuminated 
  5. Connect a 3A fused jumper wire between the control circuit terminal 16 and B+.
  6. Listen as the KR113 Child Security Lock Disable Relay activates.
    • If the KR113 Child Security Lock Disable Relay does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 16 X5 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X50A Fuse Block-Underhood.
    • If the KR113 Child Security Lock Disable Relay activates 
  7. Replace the K9 Body Control Module.
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