B00C1: Passenger Seat Occupant Classification Sensor "B" (Subfault)

What it means

The restraint control module monitors passenger 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

Passenger seat occupant classification sensor B supplies one of the inputs used to determine whether the passenger seat is empty or occupied and to manage passenger-airbag status. B00C1 identifies a fault involving sensor B or its circuit, but does not specify the failure mode.

Common causes

Most likely first.

1. Faulty passenger seat occupant classification sensor B
2. Damaged wiring or connector beneath the seat
3. Seat cushion or upholstery issue affecting sensor readings
4. Fault in the occupant classification or restraint control module

Symptoms

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

How to diagnose it

1. Scan the occupant-classification and restraint modules, review freeze-frame data, and check sensor B's live status alongside the passenger-airbag indicator.
2. Clear the passenger seat and check for objects trapped around the cushion that might affect sensor B's reading.
3. Inspect the passenger seat cushion and upholstery for damage or alteration, then examine accessible sensor B wiring and connectors beneath the seat.
4. Follow the manufacturer's procedure to compare the classification data with the seat unoccupied and with an approved occupant or test condition, checking whether sensor B responds plausibly.
5. Test sensor B and its circuit against the manufacturer's specification before considering a fault in the occupant-classification or restraint module.

Common fixes

• Remove objects interfering with passenger seat sensor B.
• Repair loose, damaged, or corroded wiring or connectors for sensor B.
• Repair seat cushion or upholstery damage affecting the sensor using the manufacturer's procedure.
• Replace sensor B or repair the classification or restraint module if testing confirms that component is faulty.

Can I keep driving?

A fault in passenger-seat classification can affect passenger-airbag status, so get the restraint system diagnosed promptly and avoid relying on the indicator alone. Do not carry a child in a front seat unless the vehicle's instructions permit it and the airbag status is appropriate.