LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2019 >> Regal Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Hatch Release Malfunction >> Circuit/System Testing

Circuit/System Testing

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: A23C Liftgate Latch Assembly
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 1 & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Verify the fuse is not open: F6UA Fuse
    • If the fuse is open 
    1. Replace the component: F6UA Fuse
    2. Verify the fuse does not open.
      • If the fuse opens - Test or replace the component: X50A Fuse Block - Underhood
      • If the fuse does not open, go to the next step.
    • Go to 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: Rear Body Closure 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: A23C Liftgate Latch Assembly

    • Go to next step: If the test lamp does not turn On and Off 
  8. Ignition/Vehicle - Off
  9. Connect the electrical connector: A23C Liftgate Latch Assembly
  10. Disconnect the electrical connector: X1 @ X50A Fuse Block - Underhood
  11. Ignition - On/Vehicle - In Service Mode
  12. Momentarily connect a 7.5 A fused jumper wire between the test points: Control circuit terminal B5 X1 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: A23C Liftgate Latch Assembly

    • If the component does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: A23C Liftgate Latch Assembly
    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.
      • Go to next step: 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Control circuit terminal 3 @ Component harness & Control circuit terminal B5 X1 @ Fuse Block Harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: A23C Liftgate Latch Assembly
    • Go to next step: If the component turns On and Off 
  13. Ignition/Vehicle & All vehicle systems - Off
  14. Verify the fuse is not open: F6UA Fuse
    • If the fuse is open 

      Test or replace the component: X50A Fuse Block - Underhood

    • Go to next step: If the fuse is not open 
    15. 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.

  15. Ignition/Vehicle & All vehicle systems - Off
  16. Disconnect the electrical connector: X5 @ X50A Fuse Block - Underhood
  17. Test for less than 10 ohms between the test points: Ground circuit terminal H2 X5 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal H2 X5 & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  18. Connect the electrical connector: X1 & X5 @ X50A Fuse Block - Underhood
  19. Disconnect the electrical connector: X1 @ K9 Body Control Module
  20. Ignition - On/Vehicle - In Service Mode
  21. Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 6 X1 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: A23C Liftgate Latch Assembly

    • If the component does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X1 @ X50A Fuse Block - Underhood
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 6 X1 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points: Control circuit terminal 6 X1 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Control circuit terminal 6 X1 @ Control module harness & Control circuit terminal B8 X1 @ Fuse Block Harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: X50A Fuse Block - Underhood
    • Go to next step: If the component turns On and Off 
  22. Replace the component: K9 Body Control Module

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: S46 Liftgate Handle Switch
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 3 @ Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Momentarily connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 3
  6. Verify the component turns On and Off when connecting and disconnecting the jumper wire: A23C Liftgate Latch Assembly
    • If the component does not turn On and Off 
    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.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Signal circuit terminal 1 @ Component harness & Terminal 15 X6 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: K9 Body Control Module
    • Go to next step: If the component turns On and Off 
  7. Test or replace the component: S46 Liftgate Handle Switch
scientia non olet · About LEMON Manuals