B0057: Third Row Center Seatbelt Sensor (Subfault)

What it means

This code identifies a fault associated with the third row center seat belt sensor. The restraint control module sets it when it detects a problem with this sensor; the specific fault is identified by accompanying subfault information.

How it works

The third-row center seat-belt sensor sends that seating position's belt status to the restraint control module. The module monitors the signal and its circuit for a fault; the accompanying subfault information identifies the detected failure.

Common causes

Most likely first.

1. Damaged seat belt sensor wiring or connector
2. Faulty seat belt sensor
3. Seat belt buckle or latch fault
4. Restraint control module fault

Symptoms

• Airbag warning light on
• Seat belt warning may stay on
• Seat belt status may be misreported

How to diagnose it

1. Use a restraint-capable scan tool to record the B0057 subfault and freeze-frame data before clearing it.
2. Check that the third-row center belt is routed correctly and its buckle latches and releases normally.
3. Inspect the center buckle connector and wiring for looseness, corrosion, pin damage, or pinching as the third-row seat moves or folds.
4. Watch third-row center belt-status data while operating the buckle to see whether the scan-tool reading changes consistently.
5. Test the center sensor circuit following the manufacturer's procedure before considering a restraint control module fault.

Common fixes

• Reconnect or repair the third-row center buckle wiring.
• Repair corrosion or damage at the buckle sensor connector.
• Replace the faulty third-row center seat-belt sensor or buckle assembly.
• Repair or replace the restraint control module only after the sensor circuit and module connections pass checks.

Can I keep driving?

The vehicle may be driveable, but the system may misread whether the third-row center belt is fastened and may not operate as intended in a crash. Confirm the belt latches securely and arrange prompt diagnosis.