B00B0: Driver Seat Occupant Classification Sensor "A" (Subfault)

What it means

Fault on driver seat occupant classification sensor A — typically a force/weight sensing pad in the seat cushion that determines passenger weight class.

At a glance

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

How it works

Driver seat occupant classification sensor A is one sensing element used by the restraint system to assess the driver-seat load or classification. B00B0 means the module has detected a fault associated with sensor A or its circuit, but it does not specify the failure mode.

Common causes

Most likely first.

1. Faulty driver seat occupant classification sensor A
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. Read restraint-module codes and available driver-seat classification data with a compatible scan tool before clearing anything.
2. Check whether B00B0 returns and note whether other driver-seat sensor codes are present, which may indicate a shared wiring or module issue.
3. Inspect the driver-seat cushion and upholstery for damage, modifications, or pressure points that could disturb sensor A readings.
4. With the restraint system made safe according to the manufacturer's procedure, inspect sensor A's under-seat wiring and connectors for damage, looseness, or corrosion.
5. Test sensor A and its circuit against the manufacturer's diagnostic procedure, comparing its reading with other available seat-sensor data.
6. If sensor A and its circuit pass, check the restraint control module connections and operation using vehicle-specific diagnostics.

Common fixes

• Correct seat-cover or upholstery interference affecting the driver-seat sensor readings.
• Reconnect and secure a loose sensor A connector.
• Repair damaged wiring or terminals in the sensor A circuit.
• Replace driver seat occupant classification sensor A if tests confirm failure.
• Repair or replace the restraint control module only if diagnostics isolate the fault there.

Can I keep driving?

A driver-seat classification fault may affect restraint operation in a crash. Arrange prompt diagnosis and drive cautiously until the airbag system has been checked.