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Circuit/System Testing

Liftgate Unlatch Switch Malfunction

  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S46B Liftgate Unlatch Switch. 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 4 and ground.
    • If 10 Ω or greater 
    1. Vehicle 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. Vehicle in Service Mode.
  4. Verify the scan tool Door Lock Switch parameter is Inactive.
    • If not Inactive 
    1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 2 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 3 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 3 and the ground circuit terminal 4.
  6. Verify the scan tool Door Lock Switch parameter is Unlock.
    • If not Unlock 
    1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit terminal 3 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 2 and the ground circuit terminal 4.
  8. Verify the scan tool Door Lock Switch parameter is Lock.
    • If not Lock 
    1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit terminal 2 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 S46B Liftgate Unlatch Switch.

Liftgate Lock Actuator Malfunction

  1. Vehicle OFF, disconnect the X2 harness connector at the K9 Body Control Module, Vehicle in Service Mode.
  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. Vehicle 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. Vehicle 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 the M14B Door Lock Actuator-Liftgate.
    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 M14B Door Lock Actuator-Liftgate.
    • If the test lamp illuminates 
  3. Vehicle OFF, disconnect the harness connector at the M14B Door Lock Actuator-Liftgate.
  4. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, Vehicle in Service Mode.
  5. Verify the test lamp turns ON and OFF when commanding the Lock and Unlock states with a scan tool.
    • If the test lamp is always OFF 
    1. Vehicle OFF, remove the test lamp, disconnect the X6 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
    3. Test for less than 2 Ω in each 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  6. Test or replace the M14B Door Lock Actuator-Liftgate.
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