B0030
Second Row Left Side Airbag Deployment Control
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Code B0030 indicates a fault in the second row left side airbag deployment control circuit. This airbag is designed to protect rear-seat passengers sitting behind the driver during a side impact collision. Vehicles equipped with second-row side airbags typically have them mounted in the rear seat bolster or the rear door panel, and they provide critical head and torso protection for rear occupants.
While this code does not affect vehicle drivability, it means the protective system for rear-seat passengers on the left side is compromised. This is especially concerning for families who regularly transport passengers in the back seat, including children in booster seats who have outgrown their child safety seats and rely on the vehicle's airbag system for supplemental protection.
Diagnosis should be performed by a professional technician using an SRS-capable scan tool. The wiring for second-row side airbags runs through areas that are frequently disturbed — under rear seats where items are stored, along seat mounting brackets where child seats are installed, and through door jamb transition points. Connectors can loosen or corrode over time. If the module itself has failed, accessing it typically requires partial disassembly of the rear seat or door panel. As with all SRS components, only trained technicians should perform these repairs.
Severity
Symptoms
- •Airbag warning light illuminated on dashboard
- •SRS system malfunction message on instrument cluster
- •Warning chime at startup related to the supplemental restraint system
- •No noticeable driving change — the risk is to rear-seat passengers in a side impact
Likely Causes
The second-row side airbag wiring runs under or alongside the rear seat and through the C-pillar area. This routing makes it susceptible to damage from items stored under seats, child seat installations, or moisture from rear window leaks.
The side airbag inflator in the rear seat bolster or rear door panel may have a squib with out-of-range resistance, indicating degradation or damage to the pyrotechnic element.
The SRS controller monitors all deployment loops including second-row devices. An internal fault, power supply instability, or corrupted calibration data can cause false faults on this circuit.
The satellite impact sensor in the rear door or C-pillar area may be damaged or have a communication fault, causing the control module to flag the associated second-row airbag deployment loop.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Inspect and repair wiring harness and connectors in the rear seat and C-pillar area
- Replace the second row left side airbag module
- Replace the rear side impact sensor if faulty
- Replace and reprogram the SRS control module