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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.
    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:
    • {Station Wagon} Ground circuit terminal 1 & Ground
    • {Hatchback} 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:
      • {Station Wagon} Ground circuit terminal 1 @ Component harness & Ground Connection
      • {Hatchback} 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. Verify the component is not activated: A23C Liftgate Latch Assembly
    • 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:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Ground
      • {Hatchback} 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
    • Go to next step: If the specified state 
  5. Connect a 3 A fused jumper wire between the test points:
    • {Station Wagon} Signal circuit terminal 2 & Ground circuit terminal 1
    • {Hatchback} Signal circuit terminal 1 & Ground circuit terminal 3
  6. Verify the component produces a clicking sound: A23C Liftgate Latch Assembly
    • If the component does not produce a sound 
    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:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Ground
      • {Hatchback} 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 less than 2 ohms between the test points:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Terminal 15 X6 @ Control module harness
      • {Hatchback} 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 - Replace the component: K9 Body Control Module
    • Go to next step: If the component produces a sound 
  7. Test or replace the component: S46 Liftgate Handle Switch
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