B0030

Code

Generic B — Body

Second Row Left Side Airbag Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 45 EN: 105 RU: 40

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in second-row left airbag squib (inflator) circuit
Corroded, loose or damaged connector at airbag module, seat, or harness
Faulty second-row left airbag module (squib/inflator)
Damaged wiring (pinch, chafe, rodent, prior repair damage)
Faulty airbag control unit (ACU) or seat module
Low or intermittent battery voltage, poor ground

Symptoms

Illuminated SRS/airbag warning lamp on instrument panel
Possible message on dash indicating airbag fault or disabled airbag
Second-row left-side airbag will be disabled until fault is cleared and repaired
Other related SRS codes may be present
Occasional/ intermittent SRS light flicker or permanent on

What to check

Read and record all SRS codes and freeze frame data with a capable scan tool
Visual inspection of second-row left seat, seat belt pretensioner area, and associated wiring harness for damage or pinching
Inspect connectors at seat, airbag module, and ACU for corrosion, bent pins, or loose terminals
Check vehicle battery voltage and ground connections
Measure squib resistance at the airbag connector and at the ACU connector (compare to spec)
Perform continuity and short-to-ground/short-to-B+ tests on the squib circuit

Signal parameters

Typical squib resistance: low single-digit ohms (commonly ~2–5 Ω) — exact spec is vehicle dependent
Open circuit: infinite Ω (no continuity)
Short to ground/battery: near 0 Ω or very low resistance
Normal quiescent circuit voltage: approximately battery voltage at connector when key on (no deployment current)
During deployment the module supplies a high-current pulse (do not attempt to reproduce)

Diagnostic algorithm

Connect a capable scan tool, read and record B0030 plus any other SRS codes and freeze frame data.
Follow manufacturer safety procedures: disable SRS power (disconnect battery negative) and wait the specified time before probing connectors.
Perform a careful visual inspection of the second-row left seat, connector, and harness routing for damage, corrosion, or signs of repair.
With SRS power disabled and using proper procedures, disconnect the squib connector. Measure resistance of the squib at the connector and compare to vehicle specification.
Measure resistance/continuity between the squib and the airbag control module connector to check for opens. Check for short to ground or battery with insulation-resistance style test (consult service manual).
If squib resistance is out of specification (open or short), replace the airbag module (squib/inflator) or repair wiring as required. If resistance at the squib is good but wiring to the ACU is bad, repair/replace the harness or connector.
If wiring and squib check good, inspect and test the ACU/seat module outputs and grounds. Swap or bench-test modules only per factory procedure — module replacement may require coding and/or SRS initialization.
After repairs, reconnect, re-enable SRS power, clear codes, and perform SRS system checks and any required calibrations or module coding per manufacturer instructions.
Confirm fault does not return; if it does, re-check wiring, grounds, and consider replacing the airbag control module or consulting dealer-level diagnostics.

Likely causes

Short to ground or short to battery in the left-side squib harness
Open circuit in squib (high resistance or infinite)
Connector corrosion or poor terminal contact at seat/airbag/ACU
Failed squib (out-of-spec resistance)
Faulty ACU or internal driver transistor degraded

Fault status

⚠️ Status

Stored when the SRS control module detects an open, short, or abnormal resistance in the second-row left-side airbag deployment circuit. The SRS warning light will be on and that airbag may be disabled until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.5 hours