Third Row Center Seatbelt Sensor
The B0057 code means the vehicle's onboard diagnostic system has detected: Third Row Center Seatbelt Sensor. This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $80 - $700 (connector or wiring commonly; sensor mat or seat-sensor replacement at the high end)
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Common Symptoms
- Airbag (SRS) warning light on
- Occupant detection or belt-status behavior wrong (e.g. passenger airbag off with an adult seated)
- No drivability symptom - this is purely a safety-system fault
Probable Causes (Ranked by Likelihood)
- Faulty or disturbed sensor (this circuit's sensor is often under or inside a seat and gets damaged by movement, spills, or objects beneath the seat) High
- Damaged wiring or corroded connector in the sensor circuit High
- SRS control module input fault Low
Common Fixes by Vehicle
What techs usually find when diagnosing B0057 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2017 Toyota Camry/Corolla easy DIY
B0057 on Toyotas is almost always the passenger seat belt buckle switch. The switch tells the SRS whether the belt is latched. It is integrated into the buckle itself -- you cannot replace the switch separately. Pull the seat forward, disconnect the battery, remove the seat belt anchor bolt and buckle bolt, then swap the full buckle assembly. Clear codes with a scan tool.
Labor: 30-60 min2008-2015 Toyota Sienna easy DIY
Sienna B0057 often appears when a child seat latch plate gets jammed into the buckle. Pop open the buckle with a small flathead screwdriver and fish out the debris. If the switch is damaged from the jam, the buckle assembly needs replacement. Sienna has bench seats in some trim levels -- verify which row is triggering the code with TechStream or a bidirectional scanner.
Labor: 45-60 min2012-2020 Toyota Tacoma easy DIY
Tacoma passenger buckle codes are frequently caused by coin or gravel intrusion -- the buckle faces up and catches everything. Blow it out with compressed air and work the button 20-30 times. If the airbag light stays on, the switch is worn and the buckle must be replaced. Toyota part numbers differ by trim; verify VIN before ordering.
Labor: 30-45 minFrequently Asked Questions
What does B0057 mean?
B0057 is a generic (ISO/SAE-standardized) restraints code: a fault in the Third Row Center Seatbelt Sensor circuit. The SRS module monitors every restraint circuit continuously and sets this when that circuit fails its checks.
Can I keep driving with B0057?
An SRS fault usually means part of the airbag or seatbelt system is DISABLED until repaired - the airbag warning light stays on and that restraint may not deploy in a crash. Never probe deployment-loop (squib) circuits with a test light or ohmmeter; accidental deployment causes serious injury. SRS diagnosis belongs at a qualified shop.
Will the airbag still work with B0057 stored?
Assume no for the affected restraint. With most SRS faults, the module disables the affected circuit (sometimes the whole system) until it is repaired and the code cleared. That is why the warning light stays on.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Read the code and subfault detail with an SRS-capable scan tool.
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Check for obvious causes first: objects wedged under the seat, unplugged under-seat connectors after cleaning or repairs.
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Inspect the circuit's wiring per the OEM procedure with the SRS disabled.
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Follow the OEM calibration/relearn procedure after any occupant-sensor repair - many require a zero-point reset.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- All OBD-II vehicles - generic (ISO/SAE) restraints code standardized across makes
Related Codes
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