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Circuit/System Testing

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Central Door Lock Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48C multifunction switch 1-instrument panel. 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 7 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 Central Door Lock Switch on Console parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
    2. Test for infinite resistance between the signal circuit terminal 12 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    3. Test for infinite resistance between the signal circuit terminal 18 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 Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 7.
  6. Verify the scan tool Central Door Lock Switch on Console parameter is Unlock.
    • If not Unlock 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 18 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 Unlock 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 11 and the ground circuit terminal 7.
  8. Verify the scan tool Central Door Lock Switch on Console parameter is Lock.
    • If not Lock 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 12 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 Lock 
  9. Test or replace the S48C multifunction switch 1-instrument panel.

Driver Door Lock Malfunction

  1. Ignition OFF, verify the harness connector is firmly seated and secure for the A23D door latch assembly-driver.
    • If the harness connector not seated or secure 

      Firmly seat and secure the harness connector at the A23D door latch assembly-driver.

    • If the harness connector is firmly seated and secure 
  2. Disconnect the harness connector at the A23D door latch assembly-driver. Ignition ON.
    3. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 seconds will 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 central door lock switch to restore the voltage for testing.

  3. Test for greater than 7 V between the control circuit terminal 3 and ground.
    • If 7 V or less 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 body control module.
    2. Test for infinite resistance between the control circuit 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 on the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If greater than 7 V 
    4. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 seconds will 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 central door lock switch to restore the voltage for testing.

  4. Test for greater than 7 V between the control circuit terminal 2 and ground.
    • If 7 V or less 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 body control module.
    2. Test for infinite resistance between the control circuit 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 on the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If greater than 7 V 
  5. Test or replace the A23D door latch assembly-driver.

Passenger Door Lock Malfunction

  1. Ignition OFF, verify the harness connector is firmly seated and secure for the appropriate passenger or rear A23 door latch assembly.
    • If the harness connector not seated or secure 

      Firmly seat and secure the harness connector at the passenger or rear A23 door latch assembly.

    • If the harness connector is firmly seated and secure 
  2. Disconnect the harness connector at the appropriate passenger or rear A23 door latch assembly. Ignition ON.
    3. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 seconds will 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 central door lock switch to restore the voltage for testing.

  3. Test for greater than 7 V between the control circuit terminal listed below and ground:
    • A23P door latch assembly-passenger - control circuit terminal 7
    • A23P door latch assembly-passenger - control circuit terminal 8
    • A23RR door latch assembly-right rear - control circuit terminal 7
    • A23RR door latch assembly-right rear - control circuit terminal 8
    • A23LR door latch assembly-left rear - control circuit terminal 2
    • A23LR door latch assembly-left rear - control circuit terminal 3
    • If 7 V or less 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 body control module.
    2. Test for infinite resistance between the control circuit 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 on the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If greater than 7 V 
  4. Test or replace the A23 door latch assembly.

All Door Locks Inoperative

  1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the harness connector at each of the A23 door latch assemblies.
    4. 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 appropriate A23 door latch assembly.
    • If the test lamp illuminates 
  3. Ignition OFF, connect the X2 harness connector at the K9 body control module. Disconnect the harness connector at the A23D door latch assembly-driver, ignition ON.
    4. NOTE:

    Leaving the DMM connected between a control circuit and ground for greater than 20 seconds will 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 central door lock switch to restore the voltage for testing.

  4. Test for greater than 7 V between the control circuit terminal 2 and ground.
    • If 7 V or less 
    1. Ignition OFF, disconnect the KR113 child security lock disable relay.
    2. Disconnect the X6 harness connector at the K9 body control module.
    3. Test for infinite resistance between the control circuit terminal listed below and ground:
      • KR113 child security lock disable relay - control circuit terminal 2
      • KR113 child security lock disable relay - control circuit terminal 3
      • K9 body control module - control circuit terminal 1 X6
      • K9 body control module - control circuit terminal 4 X6
      • If less than infinite resistance, repair the short to ground on the circuit.
    1. Ignition OFF, connect the KR113 child security lock disable relay.
    2. Test for infinite resistance between the K9 body control module control circuit terminal 2 X6 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, test or replace the KR113 child security lock disable relay.
    • If greater than 7 V 
  5. Replace the K9 body control module.
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