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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: B70 Liftgate Close Switch
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K39 Liftgate Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 1 @ Component harness & Terminal 16 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If less than 10 ohms 
  4. Verify a test lamp turns On between the test points: Control circuit terminal 2 & Low Reference circuit terminal 1
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal 2 @ Component harness & Terminal 13 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition/Vehicle - Off
  6. Connect the electrical connector: B70 Liftgate Close Switch
  7. Disconnect the electrical connector: K39 Liftgate Control Module
  8. Ignition - On/Vehicle - In Service Mode
  9. Test for less than 1 V between the test points: Control circuit terminal 13 & Ground
    • If 1 V or greater 
    1. Disconnect the electrical connector: B70 Liftgate Close Switch
    2. Test for less than 1 V between the test points: Control circuit terminal @ 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: B70 Liftgate Close Switch
    • Go to next step: If less than 1 V 
  10. Test or replace the component: K39 Liftgate Control Module
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