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Home >> Cadillac >> 2019 >> XT5 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Liftgate Latch Release/Cinch Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.

Liftgate Release Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Disconnect the harness connector at the K39 Liftgate Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K39 Liftgate Control Module.
    • Go to next step: If less than 10 Ω 
  3. Connect the harness connector at the A23C Liftgate Latch Assembly.
  4. Disconnect the X3 harness connector at the K39 Liftgate Control Module. Ignition ON.
  5. Test for less than 1 V between the control circuit terminal 13 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly, ignition ON.
    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, test or replace the A23C Liftgate Latch Assembly.
    • Go to next step: If less than 1 V 
  6. Manually move the latch to cinched position.
  7. Briefly connect a 30 A fused jumper wire between the control circuit terminal 13 and 12 V.
  8. Verify the A23C Liftgate Latch Assembly performs the release function.
    • If the A23C Liftgate Latch Assembly does not release 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly.
    2. Test for infinite resistance the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: 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 A23C Liftgate Latch Assembly.
    • Go to next step: If the A23C Liftgate Latch Assembly releases 
  9. Replace the K39 Liftgate Control Module.

Liftgate Cinch Inoperative

  1. Ignition OFF, disconnect the X2 harness connector at the K39 Liftgate Control Module.
  2. Test for less than 1 V between the control circuit terminals listed below and ground:
    • Control circuit terminal 1 X2
    • Control circuit terminal 2 X2
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly. ignition ON.
    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.
    • Go to next step: If less than 1 V 
  3. Test for infinite resistance between the control circuit terminals listed below and ground:
    • Control circuit terminal 1 X2
    • Control circuit terminal 2 X2
    • If less than infinite resistance 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly.
    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, replace the A23C Liftgate Latch Assembly.
    • Go to next step: If infinite resistance 
  4. Test for less than 10 Ω between the control circuit terminal 1 and the control circuit terminal 2.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the A23C Liftgate Latch Assembly.
    2. Test for less than 2 Ω between the K39 Liftgate Control Module control circuit terminal 1 and the A23C Liftgate Latch Assembly control circuit terminal 7.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
    3. Test for less than 2 Ω between the K39 Liftgate Control Module control circuit terminal 2 and the A23C Liftgate Latch Assembly control circuit terminal 8.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the A23C Liftgate Latch Assembly.
    • Go to next step: If less than 10 Ω 
  5. Replace the K39 Liftgate Control Module.
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