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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B153A: Liftgate Latch Switches Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the electrical connector: A23C Liftgate Latch Assembly
  3. Test for less than 10 Ω between the test points: Low Reference terminal 6 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector: K39 Liftgate Control Module
    2. Test for less than 2 Ω between the test points: Low Reference terminal 6 @ Component harness & Terminal 16 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If less than 10 Ω 
  4. Ignition On/Vehicle In Service Mode
  5. Verify the scan tool parameter: Body Control Module: Rear Closure Ajar Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If the specified state 
  6. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Ratchet Switch = Closed
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 5 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If the specified state 
  7. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Pawl Switch = Closed
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If the specified state 
  8. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Sector Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K39 Liftgate Control Module
    • If the specified state 
  9. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Low Reference terminal 6
  10. Verify the scan tool parameter: Body Control Module: Rear Closure Ajar Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 3 @ Component harness & Terminal 9 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If the specified state 
  11. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference terminal 6
  12. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Pawl Switch = open
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component harness & Terminal 6 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If the specified state 
  13. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 5 & Low Reference terminal 6
  14. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Ratchet Switch = Open
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 5 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 5 @ Component harness & Terminal 5 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If the specified state 
  15. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Low Reference terminal 6
  16. Verify the scan tool parameter: Liftgate Control Module: Liftgate Latch Sector Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & Terminal 4 X1 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module
    • If the specified state 
  17. Test or replace the component: A23C Liftgate Latch Assembly
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