Airbag / SRS Warning Light On: What It Means
The airbag warning light (often labeled SRS, for Supplemental Restraint System) means the car's safety computer has found a fault and may have disabled one or more airbags or seatbelt pretensioners. The car drives normally, but in a crash the affected airbag might not deploy, so this is a safety issue you shouldn't put off. Causes are usually electrical: a sensor, connector, or the clock spring behind the steering wheel.
Trouble codes you may see
If you scan the car, these are the OBD-II codes most often behind this symptom:
Common causes
- 1
Faulty seat occupancy / passenger presence sensor
The sensor that detects a passenger to enable or disable the front airbag commonly fails or loses connection, setting codes like B0081, B1231, or B1236 and lighting the SRS warning.
- 2
Damaged clock spring
The clock spring is a coiled ribbon connector behind the steering wheel that keeps the driver's airbag wired as the wheel turns. It wears out and breaks the circuit (often related to B0100), a very common cause.
- 3
Loose or corroded connector under a seat
Connectors beneath the front seats get kicked, corroded, or unplugged, breaking an airbag circuit. Sliding seats can wear the wiring over time.
- 4
Faulty airbag or sensor circuit (open/short)
An open circuit in the driver or passenger airbag (e.g. B0001) from damaged wiring or a bad squib resistance triggers the light.
- 5
Drained backup or weak battery
Low system voltage or a recently dead battery can set a temporary SRS code that may clear once power is restored.
- 6
Airbag control module fault or stored crash data
A failing SRS module, or one that still holds codes from a previous deployment/accident, keeps the light on until it's diagnosed and reset.
What to do
The car is safe to drive in normal terms, but treat it as caution because your airbags may not work in a crash, so get it looked at soon. Try a simple check first: make sure connectors under the front seats are fully plugged in and that nothing heavy is on a passenger seat confusing the occupancy sensor. SRS faults need a scan tool that reads B-codes, so a shop is the right place to diagnose and clear it, don't poke around airbag components yourself.
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