B00B1: Driver Seat Occupant Classification Sensor "B" (Subfault)

What it means

The restraint control module monitors driver seat occupant classification sensor B as part of the seat classification system. It sets this code when it detects a fault in that sensor or its circuit; the title does not specify the failure mode.

At a glance

• Usually lights the airbag (SRS) or body-system warning light

How it works

Driver seat occupant classification sensor B provides one part of the driver-seat sensing information used by the restraint system. B00B1 identifies a fault associated with sensor B or its circuit; it does not mean sensor A, C, D, or E is faulty, nor does it state the failure mode.

Common causes

Most likely first.

1. Faulty driver seat occupant classification sensor B
2. Damaged wiring or connector beneath the seat
3. Sensor readings affected by seat or upholstery damage
4. Fault in the restraint control module

Symptoms

• Warning light or symbol related to the affected system
• Comfort or safety function impaired

How to diagnose it

1. Use a restraint-capable scan tool to read B00B1, related seat-sensor codes, and any available classification data.
2. Check whether sensor B data is missing or implausible and whether the code returns after restarting the vehicle.
3. Inspect the driver-seat cushion and upholstery near the sensing area for damage or changes that could affect sensor B.
4. Following the manufacturer's restraint-system precautions, inspect sensor B's connector and under-seat wiring for loose, corroded, pinched, or abraded sections.
5. Test sensor B and its circuit using the manufacturer's procedure and compare its data with the other driver-seat sensors where available.
6. If the sensor and wiring pass, check the restraint control module and circuit connections for the cause.

Common fixes

• Correct upholstery or seat damage that is disturbing sensor B readings.
• Reconnect and secure sensor B's connector.
• Repair damaged wiring or terminals in the sensor B circuit.
• Replace driver seat occupant classification sensor B if testing confirms it is faulty.
• Repair or replace the restraint control module only after verifying the sensor and circuit.

Can I keep driving?

The fault may affect how the restraint system interprets the driver-seat condition during a crash. Have it diagnosed promptly and assume the airbag system may not operate as intended until repaired.