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Circuit/System Testing

Security Lockout Inoperative

  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 X4 harness connector at the K9 Body Control Module, ignition ON.
  4. Verify that a test lamp does not illuminate between the control circuit terminal 8 and ground.
    • If the test lamp illuminates 
    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 8 X4 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 8 and B+.
  6. You should either hear or feel the KR113 Child Security Lock Disable Relay click as the 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 8 X4 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.

Single Door Security Lockout Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate A23 Door Latch Assembly-Rear. Ignition ON
  2. Connect a test lamp between control circuit terminals listed below:
    • A23LR Door Latch Assembly-Left Rear - control circuit terminal 8 and control circuit terminal 9
    • A23RR Door Latch Assembly-Right Rear - control circuit terminal 8 and control circuit terminal 7
  3. Verify the test lamp turns ON and OFF when commanding the Child Security Lock Motors ON and OFF with a scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the test lamp turns ON during each of the commands 
  4. 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
    • A23LR Door Latch Assembly-Left 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 3 A 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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