What it means
This code identifies a fault associated with the second row left side airbag 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 the deployment circuit for the second-row left side airbag, which protects rear occupants in a side impact. B0030 means it detected a fault in that deployment control; the subfault data identifies the electrical condition or affected part more precisely.
Common causes
Most likely first.
- Second row airbag wiring or connector fault
- Open or shorted deployment circuit
- Faulty side airbag module
- Restraint control module fault
Symptoms
- Airbag warning light on
- Second row left side airbag may not deploy in a crash
How to diagnose it
- Read the SRS subfault and event data to confirm the affected circuit is the second-row left side airbag and identify whether the fault is current.
- Inspect the left rear seat or door area, as fitted, for disturbed trim, impact damage, moisture, or wiring caught by seat movement.
- With the SRS disabled using the vehicle procedure, check accessible connectors and harness routing for looseness, corrosion, pinching, or damage.
- Use approved SRS equipment and the manufacturer's procedure to test the deployment circuit for an open, short, or resistance outside specification.
- If the harness checks pass, test the side airbag module and restraint control module as specified, then clear and rescan.
Common fixes
- Secure a loose second-row left airbag connector or repair damaged wiring using the approved SRS procedure.
- Repair an open or short in the second-row left side deployment circuit according to the wiring diagram.
- Replace the second-row left side airbag module if its inflator circuit fails the specified test.
- Replace or program the restraint control module only after the circuit and airbag module are verified.
Can I keep driving?
The second-row left side airbag may be unavailable, so rear occupants may have reduced protection in a side crash. Have the SRS fault repaired promptly and avoid moving or dismantling the affected seat or trim.
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.