What it means
This code identifies a fault associated with the second row left frontal stage 3 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 3 of the second-row left frontal airbag deployment circuit. B0033 points to an electrical fault specific to that stage, with the subfault detail indicating the detected circuit condition.
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 the affected circuit is stage 3 of the second-row left frontal airbag.
- Inspect the rear-left seatback airbag harness and connectors for pinching, corrosion, looseness, or damage from seat or upholstery work.
- Follow the manufacturer's SRS disabling procedure before handling connectors, and avoid probing the inflator terminals directly.
- Use approved SRS test equipment to check stage 3 for an open, short, or resistance outside specification as indicated by the subfault.
- If the wiring passes, test the airbag module and restraint control module using the service procedure, then clear and rescan.
Common fixes
- Reconnect a loose stage 3 connector or repair damaged wiring with the approved SRS method.
- Repair a confirmed open or short in the second-row left stage 3 deployment circuit.
- Replace the airbag module if stage 3 fails the manufacturer's specified test.
- Replace or program the restraint control module only after the stage 3 circuit and airbag module have been checked.
Can I keep driving?
The second-row left frontal airbag's stage 3 deployment may be unavailable, reducing occupant protection in a crash. Arrange prompt SRS diagnosis and do not disturb the seatback airbag 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.