B0031

Code

Generic B — Body

Second Row Left Frontal Stage 1 Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 28 EN: 54 RU: 40

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Page language: EN

Causes

Open or shorted squib (airbag) wiring for second-row left frontal Stage 1
Corroded, loose, damaged or disconnected connector at the seat/airbag or wiring harness
Faulty airbag squib (inflator) in the second-row left frontal position
Poor or missing ground or supply voltage to the restraints control module or squib circuit
Faulty Restraints Control Module (RCM) or internal RCM driver failure
Water intrusion or corrosion in connector/harness after a repair or accident

Symptoms

SRS/Airbag warning light illuminated on dash
Possible disablement of Stage 1 deployment for second-row left frontal airbag (controller may report reduced functionality)
History of recent seat removal, interior work, or water leaks near the second-row seat
Intermittent SRS warning that may change with seat position or harness movement
Multiple related restraint codes present in memory

What to check

Read and record all SRS and network codes with an appropriate OEM-level scan tool (do not clear codes before diagnostics)
Check vehicle battery voltage and health; poor voltage can affect SRS self-tests
Visually inspect second-row left seat, seat base, and nearby harness routing for damage, pinched wires, corrosion or contamination
Inspect and gently wiggle connectors at the seat squib and RCM while observing live data for changes or faults
Measure power and ground at the RCM (with manufacturer-specified procedure)
Check for signs of water intrusion or corrosion at connectors and along harness

Signal parameters

Expected squib continuity: low resistance (typically a few ohms). Open-circuit returns OL/infinite. Short to ground approaches 0 Ω (indicative of short)
Stage 1 squib resistance typical range (manufacturer-specific): approx. 2–5 Ω (verify OE spec)
Voltage at squib circuit when power is applied: should be near battery voltage through the firing circuit path (refer to OE safe test procedures)
RCM communication: CAN/LIN messages present with no loss-of-communication codes (check bus status)
Live-data flag: RCM channel status for second-row left frontal Stage 1 (OK/FAULT)

Diagnostic algorithm

SAFETY FIRST: Disable the vehicle battery negative terminal and wait manufacturer-specified time (commonly 90 seconds or more) before accessing airbag connectors or squibs.
Record all codes and freeze frame data using an SRS-capable scan tool. Do NOT attempt to fire or test deploy an airbag with diagnostic power.
Visually inspect connectors and wiring for the second-row left frontal squib: look for corrosion, bent pins, broken wires near seat tracks and connectors. Repair any mechanical damage.
With battery reconnected and vehicle in a safe state per OEM instructions, use a scan tool to view live-channel status for the affected squib while performing gentle wiggle tests on harness and connectors to try to reproduce the fault.
With battery disconnected and using ohmmeter, measure squib continuity at the connector and compare to OE spec. Open circuit indicates broken wiring or failed squib; near-zero indicates short. IMPORTANT: measure only with system de-powered.
If wiring to the squib is OK, inspect and test the wiring back to the RCM for opens/shorts to ground or battery and for proper resistance. Repair any damaged wiring or connectors.
Check RCM power, ignition sense, and ground circuits per wiring diagram. Repair poor grounds or power connections.
If wiring and squib check good and connectors are clean, consider RCM channel failure — verify by checking other channels and performing manufacturer-recommended RCM tests. Follow service manual procedures for RCM replacement and module coding if required.
After all repairs, clear codes with the scan tool, perform SRS self-tests, verify no new codes set, and confirm SRS light stays off through key cycles and a short test drive.
Notes: Always follow manufacturer-specific SRS repair and handling procedures. Replace squibs and modules only with approved parts and follow proper disposal procedures for deployed/defective inflators.

Likely causes

Damaged wiring harness where it flexes (seat belt anchor, seat tracks, door opening area)
Disconnected or partially seated airbag connector after seat removal/servicing
Low battery or intermittent battery/ignition supply to RCM during last cycle
Corroded pins inside the squib/seat connector causing high resistance
RCM driver channel degraded or failed

Fault status

⚠️ Status

The Restraints Control Module detected a fault on the Stage 1 deployment control circuit for the second-row left frontal airbag. The system has logged an error and may disable that deployment stage until the fault is corrected.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-3.0 hours