Airbags

B00B1 — Driver Seat Occupant Classification Sensor B Fault

Severity: medium Safe to drive

What B00B1 means

The restraint control module detected a problem in the circuit or signal of occupant classification sensor B in the driver seat. This system normally senses whether the seat is occupied and how much load is on it, so the airbag can deploy appropriately. When the signal is faulty, the module stores the code and turns on the airbag light.

Symptoms

  • Airbag (SRS) warning light is on
  • Occupant classification system error message
  • Other related restraint warnings on the dash
  • Code stored in the airbag module and visible on a scan

Possible causes

  1. Faulty occupant classification sensor B in the driver seat
  2. Poor connection at the connector under the seat
  3. Broken, chafed or corroded seat wiring
  4. Sensor damaged during seat removal or upholstery work
  5. Faulty airbag control module (uncommon)

How to diagnose

  1. Scan all modules with a tool that reads SRS codes and note the freeze frame data
  2. Clear the code and see whether it returns right away or only under certain conditions
  3. Inspect the connector and harness under the driver seat for damage, moisture and corrosion
  4. Check for pinched wiring from seat adjustment or recent seat covers or heater installs
  5. Test resistance and voltage in the sensor circuit per the factory wiring diagram
  6. Verify power and ground to the airbag module and inspect its connectors
  7. If the circuit is good, evaluate the sensor using scan tool data

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the occupant classification sensor
  • Replace or reprogram the airbag module if confirmed faulty
  • Clear the code and perform any required system calibration after repair

Questions and answers

Can I drive with code B00B1?

Yes, handling is not affected. But the airbag system may not work as intended, so get it diagnosed soon.

What does B00B1 mean?

It is a fault in the circuit of occupant classification sensor B in the driver seat. The usual culprits are a connector, wiring or the sensor itself.

Can I just clear the code?

You can, but if the cause remains the code and airbag light will return. Find and fix the fault first.

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.