Fault Family System: Body (B-Codes) 11 SAE Codes

SRS Seatbelt Buckle Tension Sensor Circuit

Diagnostic & Technical Explanation

Code B0050 (Driver Seat Belt Sensor) sets when the SRS module cannot read a plausible signal from a seat belt buckle switch or the belt tension sensor at a given seating position -- the switch stays latched-open or latched-closed regardless of actual buckle state, or the tension sensor's signal falls outside its calibrated range. This information feeds the seat belt reminder chime, the occupant classification system, and the airbag deployment algorithm, since a properly belted occupant may receive a different deployment strategy than an unbelted one. Typical causes are a worn buckle switch contact, a connector at the base of the seat exposed to repeated flexing, or a tension sensor damaged by a prior full seat-track travel.

These 11 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 11 times.

Codes in this family (11)

Code	Definition	Repair coverage
B0050	Driver Seat Belt Sensor	4 ranked fixes
B0051	First Row Center Seat Belt Sensor	4 ranked fixes
B0052	Passenger Seat Belt Sensor	4 ranked fixes
B0053	Second Row Left Seat Belt Sensor	4 ranked fixes
B0054	Second Row Center Seat Belt Sensor	4 ranked fixes
B0055	Second Row Right Seat Belt Sensor	4 ranked fixes
B0056	Third Row Left Seat Belt Sensor	4 ranked fixes
B0057	Third Row Center Seat Belt Sensor	4 ranked fixes
B0058	Third Row Right Seat Belt Sensor	4 ranked fixes
B0060	Driver Seat Belt Tension Sensor	4 ranked fixes
B0061	Passenger Seat Belt Tension Sensor	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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