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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 >> Liftgate Release Malfunction (Without TB5) >> 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.

Test 1

    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: S46B Liftgate Unlatch Switch
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 2 & Ground
    • If 10 Ω or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 2 @ Component harness & Ground Connection
      • 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 
  4. Ignition On/Vehicle In Service Mode
  5. Verify the scan tool parameter: Trunk Lid/Liftgate Window Exterior Unlatch Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body 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: K9 Body Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
  7. Verify the scan tool parameter: Trunk Lid/Liftgate Window Exterior Unlatch Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K9 Body 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 15 X6 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the specified state 
  8. Test or replace the component: S46B Liftgate Unlatch Switch

Test 2

    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: M30 Liftgate Latch
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 1 & Ground
    • If 10 Ω or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 1 & Ground Connection
      • 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 
  4. Verify the fuse is not open: F39RA Fuse
    • If the fuse is open 
    1. Replace the component: F39RA Fuse
    2. Verify the fuse does not open.
      • If the fuse opens, test or replace the component: X53A Fuse Block - Rear Body
      • If the fuse does not open, go to the next step.
    • If the fuse is not open 
  5. Connect a test lamp between the test points: Control circuit terminal 3 & Ground circuit terminal 1
  6. Ignition On/Vehicle In Service Mode
  7. Perform the scan tool control function: Liftgate Unlatch Unlatch

    Verify the test lamp does not turn On and Off.

    • If the test lamp turns On and Off 

      Test or replace the component: M30 Liftgate Latch

    • If the test lamp does not turn On and Off 
  8. Ignition/Vehicle Off
  9. Connect the electrical connector: M30 Liftgate Latch
  10. Disconnect the electrical connector: X2 @ X53A Fuse Block - Rear Body
  11. Ignition On/Vehicle In Service Mode
  12. Momentarily connect a 15 A fused jumper wire between the test points: Control circuit terminal 16 X2 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: M30 Liftgate Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: M30 Liftgate Latch
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Control 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 infinite resistance between the test points: Control circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    7. Test for less than 2 Ω between the test points: Control circuit terminal 3 @ Component harness & Control circuit terminal 16 X2 @ Fuse Block Harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the component: M30 Liftgate Latch
    • If the component turns On and Off 
  13. Ignition/Vehicle & All vehicle systems Off
  14. Verify the fuse is not open: F39RA Fuse
    • If the fuse is open 

      Test or replace the component: X53A Fuse Block - Rear Body

    • If the fuse is not open 
  15. Connect a test lamp between the test points: Control circuit terminal 15 X2 & Ground
  16. Perform the scan tool control function: Liftgate Unlatch Unlatch

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle Off
    2. Test for infinite resistance between the test points: Control circuit terminal 8 X4 @ Control module harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω between the test points: Control circuit terminal 8 X4 @ Control module harness & Control circuit terminal 15 X3 @ Fuse Block Harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the component: K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle Off & Remove Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 8 X4 @ Control module harness & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the component: K9 Body Control Module
    • If the test lamp turns On and Off 
  17. Connect a test lamp between the test points: Control circuit terminal 14 X2 & B+
  18. Perform the scan tool control function: Liftgate Unlatch Unlatch

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle Off & Remove Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 20 X5 @ Control module 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: Control circuit terminal 20 X5 @ Control module harness & Control circuit terminal 14 X2 @ Fuse Block Harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle Off & Remove Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 20 X5 @ Control module harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the component: K9 Body Control Module
    • If the test lamp turns On and Off 
  19. Replace the component: X53A Fuse Block - Rear Body
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