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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:

The seat belt buckle replacement with the seat belt tension sensor must be serviced as a complete unit.

When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:

  • Passenger seat belt tension sensor
  • Passenger presence module
  • Passenger seat belt tension sensor wiring harness connector
  • Passenger presence module wiring harness connector
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B61P Seat Belt Tension Sensor - Passenger. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If greater than 10 Ω 
    1. Ignition OFF, disconnect the harness connector at the K85 Passenger Presence Module. It may take up to 2 min for all vehicle systems to power down.
    2. Test for less than 10 Ω between the low reference circuit and ground.
      • If less than 10 Ω, replace the K85 Passenger Presence Module.
      • If greater than 10 Ω, repair the open/high resistance.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for less than 6 V between the signal circuit terminal 1 and ground.
    • If 6 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K85 Passenger Presence Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K85 Passenger Presence Module.
    • Go to next step: If less than 6 V 
  5. Ignition OFF.
  6. Test for greater than 5 KΩ between the signal circuit terminal 1 and ground. It may take up to 2 minutes for all vehicle systems to power down.
    • If less than 5 KΩ 
    1. Disconnect the harness connector at the K85 Passenger Presence Module.
    2. Test for Infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K85 Passenger Presence Module.
    • Go to next step: If greater than 5 KΩ 
  7. Disconnect the harness connector at the K85 Passenger Presence Module.
  8. Test for less than 2 Ω between the B61P Seat Belt Tension Sensor - Passenger signal circuit terminal 1 and the K85 Passenger Presence Module signal circuit terminal 6.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  9. If all circuits test normal, replace the B61P Seat Belt Tension Sensor - Passenger.
  10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  11. Verify DTC B0071 does not set.
    • If DTC B0071 is set 

      Replace the K85 Passenger Presence Module.

    • Go to next step: If DTC B0071 is not set 
  12. All OK.
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