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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. 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: 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
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