B0041

Code

Generic B — Body

Third Row Left Frontal Stage 1 Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 30 EN: 55 RU: 32

AI status

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Page language: EN

Causes

Open or short in the stage‑1 squib circuit
High resistance in squib, connector, or wiring
Corroded or loose connector or terminal
Damaged wiring harness (pinch, chafe, rodent damage)
Failed squib/inflator (internal open or short)
Faulty airbag control module or module driver for that channel

Symptoms

SRS (airbag) warning lamp illuminated on instrument panel
DTC B0041 stored in the SRS module; possible related B‑codes
Vehicle may disable the third‑row left frontal airbag deployment
Possible occupant restraint system warning or message on dash
Failed vehicle safety inspection where SRS faults are checked

What to check

Use a capable scan tool to read all SRS codes and freeze‑frame data; note related codes and U‑codes
Check for Technical Service Bulletins (TSBs) or recall information for this circuit
Visually inspect third row left seat, connectors, and wiring for damage, corrosion or unsecured connectors
Verify airbag control module supply voltage and ground integrity
Check fuses and relays related to SRS power
Measure squib resistance with ignition OFF per manufacturer procedure (do not use an ohmmeter if manufacturer prohibits)

Signal parameters

Squib resistance (stage‑1) — typical low ohms (example 0.5–5 Ω); consult vehicle spec before comparing
Circuit open = infinite ohms; short to ground/power = near 0 Ω or abnormal low value
Key ON (engine OFF) circuit voltage at squib connector — should be near battery voltage where expected per wiring diagram
Airbag control module supply voltage (key ON) — typically ~12 V; measure grounds for low resistance
CAN/serial communication status with SRS module (present/absent) as reported by scan tool
Stored freeze‑frame data: ignition state, vehicle speed, battery voltage at time of fault

Diagnostic algorithm

Safety first: follow manufacturer SRS procedures. Disable the SRS system before probing (disconnect negative battery terminal and wait manufacturer‑specified time) and use appropriate PPE.
Connect a diagnostic scan tool. Retrieve and record all SRS codes and freeze‑frame/last‑occurrence data. Note any related codes.
Visually inspect the third row left seat area: connectors, pigtails, harness routing, and attachment points for chafing, corrosion, or damage.
Inspect connector pins for corrosion, bent pins, pushed‑out terminals or moisture. Reseat connectors and apply dielectric if required by procedure.
With ignition OFF and SRS disabled per procedure, measure squib resistance at the seat connector and at the airbag module harness end. Compare to manufacturer specification. If resistance is out of spec, replace squib/inflator or repair connector as specified.
Check continuity between the airbag module and squib connector. If open, isolate and repair wiring. If short to power/ground suspected, perform backprobe voltage checks with ignition ON using proper cautions.
Verify module power and ground circuits: check fuses, relays and ground points for low resistance. Repair any poor grounds or supply issues.
If wiring and connectors test good and squib resistance is within spec, suspect airbag control module channel fault. Verify using manufacturer tests; module replacement and programming may be required.
After repairs, clear codes with scan tool and perform the SRS self‑test. Confirm the B0041 does not return and that no new SRS codes are present.
If code returns or diagnostics are inconclusive, consult vehicle manufacturer service procedures or escalate to SRS specialist. Always document repairs and verify system readiness.

Likely causes

Connector at third row left seat is corroded or not fully seated
Short to battery or ground at a wiring splice near the seat
Open/shorted squib inside the inflator assembly (resistance out of spec)
Damaged wiring where harness passes through seat/trim or into body
Poor ground or blown fuse supplying the airbag module
Faulty airbag control module driver channel

Fault status

⚠️ Status

The airbag control module has detected a fault in the Stage‑1 deployment control circuit for the third row left frontal occupant. This indicates an open, short, high resistance, or driver/channel fault that could prevent proper deployment of that stage of the inflator.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours