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HOMESERVICE MANUALSBUICK2018REGAL BASEREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL INFLATABLE RESTRAINT SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0074CIRCUIT/SYSTEM TESTING
2018 Buick Regal Base

Circuit/System Testing

2018 Buick Regal BaseSECTION Circuit/System Testing
NOTE:

This system is serviced as a kit (seat foam, module and/or sensing mat). Perform a Passenger Presence System Preload whenever a component is replaced, refer to Passenger Presence System Re-Zeroing . Inspect component connectors for damage or corrosion. Repair or replace the affected component/connector:

  1. Confirm that all passenger presence system connectors are fully seated.
  2. Verify that DTC B0074 0F is not set.
    • DTC B0074 0F is set. 
      NOTE:

      Verify there are no electronic devices on the passenger seat. If not, then verify the seat is dry by removing the trim from the seat bottom frame. If the seat is wet, allow 24-48 hours dry time with trim completely off. If the DTC is history, do not replace B60 Passenger Presence Sensor. Clear passenger presence module DTCs.

    1. Verify there are no electronic devices on the passenger seat.
      • Completely empty the passenger seat of any objects
      • Go to next step: If the seat is empty
    2. Verify the seat is dry by removing the trim from the seat bottom frame.
      • If the seat is wet, allow 24-48 hours dry time with trim completely off.
      • Go to next step: If the seat is dry
    3. If the DTC is history, do not replace B60 Passenger Presence Sensor, and clear passenger presence module DTCs.
    • Go to next step: DTC B0074 0F does not set. 
  3. Verify DTC B0074 00, B0074 0D or B0074 0E is not set.
    • DTC B0074 00, B0074 0D or B0074 0E is set. 

      Replace the K85 Passenger Presence Module.

    • Go to next step: DTC B0074 00, B0074 0D or B0074 0E do not set. 
  4. All OK.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.