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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, 2019 Buick Regal, and 2018 Buick Regal TourX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Use the wiring schematics to verify the items listed below:
    • The control module's B+, and ground circuits.
    • The control module terminal numbers.
  • Some control module ground circuits may require up to 20 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.
  1. Ignition Off, disconnect the connector(s) at the appropriate control module.
  2. Verify a test lamp illuminates between each ground circuit terminal and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  5. Verify voltage at each B+ circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on B+ circuit.

    • Go to next step: If the specified value 
  6. Verify a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the ignition circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the ignition circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  7. Verify voltage at each ignition circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit.

    • Go to next step: If the specified value 
  8. Replace the control module.
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