B0089 DTC – Passenger Presence System (PPS) Sensor Circuit Malfunction

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B0089 DTC – Passenger Presence System (PPS) Sensor Circuit Malfunction

The Diagnostic Trouble Code (DTC) B0089 indicates that the Supplemental Restraint System (SRS) has detected a malfunction in the Passenger Presence System (PPS) sensor circuit. The PPS determines whether the front passenger seat is occupied and helps the SRS module decide whether the passenger airbag should be enabled or suppressed. The exact system design varies by manufacturer.

Symptoms

  • Airbag warning light illuminated.
  • Service Airbag message displayed.
  • Passenger Airbag OFF indicator remains on or flashes.
  • Passenger airbag may be disabled.
  • B0089 stored in the SRS module.

Possible Causes

  • Faulty Passenger Presence Sensor.
  • Damaged seat occupancy mat.
  • Loose or corroded connector under the passenger seat.
  • Open or short circuit in the wiring harness.
  • Faulty Passenger Presence Module.
  • SRS (SDM) control module malfunction.

How to Diagnose B0089

  1. Scan the SRS system for all stored DTCs.
  2. Inspect the wiring and connectors beneath the passenger seat.
  3. Check for damaged or pinched seat wiring.
  4. Verify sensor signals using a professional scan tool.
  5. Perform Passenger Presence System calibration if required.
  6. Replace the faulty sensor or module if necessary.
  7. Clear the DTC and verify that it does not return.

Typical Circuit Diagram

 Passenger Presence Sensor
            │
            │
            ▼
 Passenger Presence Module
            │
            │
            ▼
      SRS Control Module
            │
            ▼
 Passenger Airbag Control

Repair Cost

  • Wiring repair: $30–120
  • Passenger Presence Sensor replacement: $150–500
  • Seat occupancy mat replacement: $200–700
  • Passenger Presence Module replacement: $200–600

Related DTCs

  • B0088
  • B0089
  • B0090
  • B0091

FAQ

Can I drive with DTC B0089?

Yes, but the passenger airbag may not deploy correctly during a collision, reducing occupant protection.

Does B0089 always require seat replacement?

No. Many cases are caused by damaged wiring or connectors under the seat. Proper diagnosis should be completed before replacing expensive components.

Does the Passenger Presence System require calibration?

Yes. Many vehicles require calibration after replacing the occupancy sensor, seat cushion, or Passenger Presence Module.

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