Fault Family System: Body (B-Codes) 16 SAE Codes

SRS Impact Rollover Sensor Circuit

Diagnostic & Technical Explanation

Code B0090 (Left Frontal Restraints Sensor) sets when the SRS module loses a valid signal from one of the satellite impact sensors mounted in the doors, pillars, or frontal crush zones, or from the rollover sensor, all of which feed the crash-severity algorithm that decides which restraints to deploy and how aggressively. A circuit fault here means the module cannot fully evaluate a future crash event at that location even though no crash has occurred, which is why these codes command the SRS warning lamp on immediately. Common causes are a corroded connector at a door- or pillar-mounted sensor exposed to moisture, a chafed harness at a door hinge or sill, or physical damage to the sensor from a prior minor collision that was never inspected.

These 16 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 16 times.

Codes in this family (16)

Code	Definition	Repair coverage
B0090	Left Frontal Restraints Sensor	4 ranked fixes
B0091	Left Side Restraints Sensor 1	4 ranked fixes
B0092	Left Side Restraints Sensor 2	4 ranked fixes
B0093	Left Side Restraints Sensor 3	4 ranked fixes
B0094	Center Frontal Restraints Sensor	4 ranked fixes
B0095	Right Frontal Restraints Sensor	4 ranked fixes
B0096	Right Side Restraints Sensor 1	4 ranked fixes
B0097	Right Side Restraints Sensor 2	4 ranked fixes
B0098	Right Side Restraints Sensor 3	4 ranked fixes
B0099	Roll Over Sensor	4 ranked fixes
B009A	Left Side Restraints Sensor 4	4 ranked fixes
B009B	Left Side Restraints Sensor 5	4 ranked fixes
B009C	Left Side Restraints Sensor 6	4 ranked fixes
B009D	Right Side Restraints Sensor 4	4 ranked fixes
B009E	Right Side Restraints Sensor 5	4 ranked fixes
B009F	Right Side Restraints Sensor 6	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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