What it means
This code identifies a fault associated with the second row left frontal stage 1 deployment control. The restraint control module sets it when it detects a problem in that deployment control; the exact fault is specified by accompanying subfault information.
How it works
The restraint control module monitors stage 1 of the second-row left frontal airbag deployment circuit. B0031 is set when that specific stage has an electrical fault; the subfault detail may indicate an open, short, or resistance outside the expected range.
Common causes
Most likely first.
- Second row airbag wiring or connector fault
- Open or shorted deployment circuit
- Faulty airbag module
- Restraint control module fault
Symptoms
- Airbag warning light on
- Second row left frontal airbag stage may be unavailable in a crash
How to diagnose it
- Read the SRS subfault and event data to verify stage 1 of the second-row left frontal airbag is identified and determine whether the fault is current.
- Inspect the rear-left seatback airbag area and its harness for impact damage, previous upholstery work, pinching, or a connector disturbed by seat movement.
- Disable the SRS according to the manufacturer's procedure, then inspect accessible stage 1 connectors and wiring for looseness, corrosion, or damage.
- Use approved SRS test equipment to test the stage 1 circuit for the condition indicated by the subfault and compare it with manufacturer specification.
- If the circuit is sound, follow the specified checks for the airbag module and restraint control module, then clear and rescan.
Common fixes
- Reconnect a loose stage 1 connector or repair damaged second-row left seatback wiring using the approved SRS method.
- Repair a confirmed open or short in the stage 1 deployment circuit.
- Replace the second-row left frontal airbag module if stage 1 fails its specified circuit test.
- Replace or program the restraint control module only after the stage 1 circuit and module are verified.
Can I keep driving?
The second-row left frontal airbag's stage 1 deployment may be impaired, reducing rear-passenger protection in a crash. Arrange prompt SRS repair and keep occupants away from disturbed seatback wiring.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.