Airbags

B00B3 — Driver Seat Occupant Classification Sensor D Fault

Severity: medium Safe to drive

What B00B3 means

The supplemental restraint system (SRS) control module monitors the occupant sensing sensors in the driver seat. These help decide whether and how forcefully the airbag and pretensioners should deploy. B00B3 means the signal from sensor D is missing, incorrect or out of range, so the system cannot reliably judge the seat condition.

Symptoms

  • Airbag (SRS) warning light on
  • Occupant detection that seems wrong for the driver seat
  • Driver airbag possibly disabled or limited
  • Light that stays on or comes and goes

Possible causes

  1. Failed driver seat occupant classification sensor D
  2. Open or shorted wiring to the sensor
  3. Corroded or loose connector under the seat
  4. Harness damaged by seat movement or wear
  5. Faulty SRS control module (uncommon)

How to diagnose

  1. Scan the SRS module, record freeze frame data and look for other seat-related codes
  2. Inspect the harness and connector under the driver seat for damage, corrosion or a loose fit
  3. Check that nothing is trapped under the seat and that the seat has not been disassembled or re-upholstered
  4. Disconnect the battery and wait the manufacturer's specified time before touching SRS connectors
  5. Test circuit continuity and resistance per the wiring diagram, and rule out shorts to ground or power
  6. Review live sensor data if the scan tool shows it
  7. If the circuit is good, replace the sensor, then evaluate the SRS module if needed
  8. Clear the code and confirm it does not return

Common fixes

  • Replace or repair occupant classification sensor D
  • Repair the damaged harness or replace the connector
  • Clean the terminals and secure the connector
  • Replace or reflash the SRS module, with sensor calibration if required

Questions and answers

Can I drive with B00B3 and the airbag light on?

Yes, the car will drive normally. But the airbag system may not work as intended in a crash, so get it diagnosed soon.

Can I just clear B00B3 myself?

You can clear it with a scan tool, but it will return if the cause remains. Work on SRS circuits is best left to a professional because of the risk of accidental airbag deployment.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.