Damaged, corroded or loose connector at the second row right seat or pillar, often disturbed by seat removal or cleaning; Wiring damage in the circuit between the SRS control unit and the deployment device, such as chafing, an open circuit or a short; Faulty deployment device (initiator or squib) with resistance out of range; Faulty or unseated shorting-bar or clock-spring style connector in the loop, depending on the model; Water ingress or corrosion in the rear footwell or under-seat wiring; Internal fault in the SRS control unit driver circuit.

B003B

Second Row Right Frontal Stage 3 Deployment Control.

Generic
Body
Generic code
High severity

How this code is built

B: SystemBody
0: Defined bySAE, the same on every car
0: AreaBody area 0
3B: FaultThe specific fault in that area

What it means

B003B is the SAE J2012 generic code for a fault in the deployment control circuit for the second row right frontal airbag or restraint device, stage 3. The SRS control unit runs a self-test on each deployment loop. It sets this code when it sees a resistance or voltage outside the expected range, such as an open circuit, a short to ground, a short to voltage or an incorrect resistance. Which device sits on this circuit depends on the vehicle, so check the manufacturer wiring information for the model.

Symptoms

Airbag or SRS warning light on and staying on
Possible 'airbag fault' message in the instrument cluster
Passenger airbag or seat occupancy indicators behaving oddly
Fault returns soon after being cleared
Other SRS or seat belt pretensioner codes stored alongside it

Possible causes

Damaged, corroded or loose connector at the second row right seat or pillar, often disturbed by seat removal or cleaninglikely
Wiring damage in the circuit between the SRS control unit and the deployment device, such as chafing, an open circuit or a shortlikely
Faulty deployment device (initiator or squib) with resistance out of rangepossible
Faulty or unseated shorting-bar or clock-spring style connector in the loop, depending on the modelpossible
Water ingress or corrosion in the rear footwell or under-seat wiringpossible
Internal fault in the SRS control unit driver circuitrare

How to diagnose

Read all stored SRS codes with freeze frame or status data and note whether the fault is current, intermittent or historic
Ask about recent work such as seat removal, trim removal, a collision or water leaks near the second row right seat
Check the battery is healthy, as low voltage can cause false SRS faults
Do a visual check of the second row right seat wiring, yellow SRS connectors and the footwell for damage, pinching or corrosion. Before any SRS work, disconnect the battery and wait the time the manufacturer specifies
Check that the connectors are fully seated and locked, and inspect the terminals for bent pins, corrosion or a missing shorting clip
Check the wiring and device resistance only as the manufacturer procedure allows, using a method that cannot deploy the device. Never probe an airbag circuit with an ordinary test meter
Check the manufacturer data for any service bulletins or known faults for this model
Clear the code, then run the self-test and confirm the fault stays cleared

How to fix

Clean, repair or replace the damaged or corroded connector and make sure it is locked
Repair or replace the damaged section of wiring, following the manufacturer's repair method for SRS harnesses
Replace the faulty deployment device or the seat or belt assembly it is part of
Dry out and treat water ingress, then replace any corroded SRS components
Replace or repair the SRS control unit only after the wiring and device are proven good, and follow the manufacturer's configuration procedure

Can I keep driving?

High severity

The car may still drive normally, but the affected airbag or restraint may not deploy in a crash, so this is a safety risk. Avoid carrying a passenger in the second row right seat and have it repaired as soon as possible.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.