B00C7: Passenger Seat Occupant Position Sensor "A" (Subfault)

What it means

The restraint module monitors passenger-seat occupant position sensor A as part of its assessment of the occupant’s position. It sets this code when the sensor’s signal or circuit does not meet the module’s expected criteria.

At a glance

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

How it works

Passenger occupant position sensor A is one of the sensors the restraint control module uses to assess where an occupant is sitting. B00C7 identifies a fault in sensor A’s signal or circuit, so the module may be unable to use that sensor’s position information reliably.

Common causes

Most likely first.

1. Failed occupant position sensor
2. Loose or damaged connector or wiring
3. Open or short in the sensor circuit
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 an SRS-capable scan tool to confirm B00C7 and capture freeze-frame data and any companion codes identifying the sensor A circuit.
2. Check live data for passenger occupant position sensor A and compare its response with the other position readings, if the scan tool exposes them.
3. Inspect sensor A’s connector and wiring under or around the passenger seat for looseness, corrosion, crushed insulation, or damage from seat movement.
4. Following the manufacturer’s SRS shutdown and handling procedure, test sensor A’s power, ground, signal, and circuit continuity for opens or shorts.
5. Compare sensor A’s output with the manufacturer’s specification to determine whether the sensor itself is faulty.
6. If sensor A and its circuit pass, check restraint-module connectors, power, and ground before suspecting the module.

Common fixes

• Reconnect or repair loose or damaged wiring at passenger occupant position sensor A.
• Repair an open or short in sensor A’s circuit.
• Replace sensor A if its signal fails the specified test.
• Correct a confirmed restraint-module connector, power, or ground fault.
• Replace or reprogram the restraint control module only when diagnosis confirms it is responsible.

Can I keep driving?

The car may be driveable, but a passenger restraint function that depends on sensor A may not assess occupant position correctly. Treat the SRS warning as a safety fault, avoid disturbing seat wiring, and have it checked promptly.