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Circuit/System Testing

Security Lockout Malfunction

  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. Test for less than 1 V between the control circuit terminal 16 and ground.
    • If greater than 1 V 
    1. Ignition OFF, 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 less than 1 V 
  5. Connect a 3 A fused jumper wire between the control circuit terminal 16 and B+.
  6. Verify the KR113 Child Security Door Lock Disable Relay activates. Listen as the KR113 Child Security Door Lock Disable Relay clicks within the X50A Fuse Block-Underhood.
    • If the KR113 Child Security Door 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 Door Lock Disable Relay activates 
  7. Connect the X5 harness connector at the K9 Body Control Module and disconnect the harness connector at the appropriate A23 Door Latch Assembly-Rear.
    8. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 s may cause the K9 Body Control Module to interpret the test as a system fault and will cause the voltage on the control circuit to drop to 0 V. If the voltage drops to 0 V, operate the door locks using the door lock switch to restore the voltage for testing.

  8. Test for greater than 3 V between the control circuit terminal 8 and ground.
    • If 3 V or less 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module.
    2. Test for less than 2 Ω between the control circuit terminals listed below:
      • K9 Body Control Module control circuit terminal 4 X6 and A23LR Door Latch Assembly-Left Rear - control circuit terminal 8
      • K9 Body Control Module control circuit terminal 4 X6 and A23RR Door Latch Assembly-Right Rear - control circuit terminal 8
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
    • If greater than 3 V 
    9. NOTE:

    When using the MIN MAX function, autorange on the DMM may not function properly. To ensure accurate test results, turn off autorange and manually set the DMM range to 00.00 V.

  9. Install a DMM between the control circuit terminals listed below and ground. Set the DMM to capture DC voltage using the MIN MAX function. Turn off autorange and manually set the DMM range to 00.00 V.
    • A23LR Door Latch Assembly-Left Rear - control circuit terminal 9
    • A23RR Door Latch Assembly-Right Rear - control circuit terminal 7
  10. Command the Child Security Lock Motors On and Off with a scan tool.
  11. Verify the MAX voltage captured by the DMM is greater than 10 V.
    • If 10 V or less 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
    2. Test for less than 2 Ω between the control circuit terminals listed below:
      • X50A Fuse Block - Underhood control circuit terminal 5 X2 and A23LR Door Latch Assembly-Left Rear - control circuit terminal 9
      • X50A Fuse Block - Underhood control circuit terminal 5 X2 and A23RR Door Latch Assembly-Right Rear - control circuit terminal 7
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
    • If greater than 10 V 
  12. Test or replace the A23 Door Latch Assembly-Rear.

Rear Window Lockout Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate A23 Door Latch Assembly-Rear. 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 3 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 ON.
  4. Verify the scan tool Rear Child Security Lock Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal listed below and ground.
      • A23LR Door Latch Assembly-Left Rear - signal circuit terminal 2
      • A23RR Door Latch Assembly-Right Rear - signal circuit terminal 4
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal and the ground circuit terminals listed below:
    • A23LR Door Latch Assembly-Left Rear - signal circuit terminal 2 and ground circuit terminal 3
    • A23RR Door Latch Assembly-Right Rear - signal circuit terminal 4 and ground circuit terminal 3
  6. Verify the scan tool Rear Child Security Lock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the fused jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If Active 
  7. Test or replace the A23 Door Latch Assembly-Rear.
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