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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.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X2 @ A11 Radio
  3. Apply the parking brake.
  4. Engine Running & Transmission in Reverse
  5. Verify a test lamp turns On between the test points: Control circuit terminal 13 & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: Control circuit terminal 13 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    3. Test for infinite resistance between the test points: Control circuit terminal 13 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Test or replace the component: K9 Body Control Module
    • Go to next step: If the test lamp turns On 
  6. Ignition/Vehicle & All vehicle systems - Off
  7. Disconnect the electrical connector: X7 @ K9 Body Control Module
  8. Ignition - On / Vehicle - In Service Mode
  9. Test for less than 1 V between the test points: Control circuit terminal 13 @ A11 Radio & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
  10. Replace the component: A11 Radio
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