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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: X5 @ X50A Fuse Block - Underhood
  3. 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 
  4. Connect the electrical connector: X5 @ X50A Fuse Block - Underhood
  5. Disconnect the electrical connector: X1 @ K9 Body Control Module
  6. Ignition - On/Vehicle - In Service Mode
  7. 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 & 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 
  8. Replace the component: K9 Body Control Module
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