B0003

Code

Generic B — Body

Driver Frontal Stage 3 Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 29 EN: 72 RU: 81

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in driver frontal Stage 3 squib circuit (wiring or connector)
Faulty driver frontal airbag module (Stage 3 squib)
Defective clock spring/steering column wiring
Poor power, ground or reference voltage to the RCM/airbag ECU
Corroded or loose connector at RCM, airbag module or impact sensor
Failed RCM/airbag ECU or internal circuitry error

Symptoms

SRS/airbag warning lamp illuminated on dash
Possible illumination of seatbelt or related restraint warning lamps
Airbag disable message or readiness state showing fault in scan tool
Driver frontal Stage 3 deployment disabled (reported by diagnostic tool)
Intermittent SRS lamp on/off with steering wheel movement (suggests clock spring)
No deployment during crash if fault present (risk to occupant protection)

What to check

Read stored and pending SRS/RCM codes and freeze-frame data with a qualified scan tool
Record battery voltage at rest and during engine cranking
Visually inspect airbag wiring harnesses, connectors, and pin terminals at the driver airbag, steering column, and RCM for damage, corrosion or disconnection
Check for Technical Service Bulletins (TSBs) or required RCM reprogramming for the vehicle
Perform a gentle wiggle test on steering column harness and connectors while monitoring live SRS data (only monitor; do not attempt deployment)
Confirm proper power and ground at the RCM/airbag ECU power and ground pins

Signal parameters

Normal vehicle battery voltage: ~12–14.5 V (engine running 13.5–14.5 V)
Typical squib circuit resistance range: approximately 0.5–5 ohms for most pyrotechnic squibs (refer to vehicle-specific spec)
Open-circuit: infinite ohms or OL reading between squib and RCM
Short-to-ground or short-to-power: near 0 ohms vs vehicle ground or battery supply
RCM communication: CAN bus active and able to exchange SRS/RCM messages with scan tool
DTC set criteria: RCM detects resistance out of expected squib range, excessive current draw, or intermittent/open signals on Stage 3 channel

Diagnostic algorithm

Read and document all SRS/RCM trouble codes, freeze frame and live data. Note ignition cycle conditions when code set.
Verify battery charge and system voltage. Recharge if below specification; then clear codes and see if code returns.
Follow all safety procedures before any SRS work: disable battery negative terminal and wait manufacturer-specified time to allow backup capacitors to discharge.
Visually inspect connectors and harnesses for damage/corrosion at driver airbag, clock spring/steering column and RCM. Repair or replace damaged connectors and recheck.
With battery disconnected and discharge time observed, disconnect driver airbag module and measure squib circuit resistance at airbag connector and at RCM connector. Compare readings to specification. An open or abnormally high resistance indicates wiring break or open squib; very low resistance indicates short.
If resistance is out of spec at the airbag connector, replace driver airbag module. If resistance is good at airbag connector but not at RCM, trace and repair wiring/connector between them.
If intermittent or steering-wheel-rotation-related fault, inspect and test the clock spring assembly and replace if faulty.
Check RCM power, ground and CAN communication. Repair poor ground/power or restore CAN communications. If RCM faults persist after wiring and module checks, evaluate RCM replacement and required programming.
After repairs, reconnect battery, clear SRS codes with scan tool, run SRS self-tests and confirm no B0003 or related codes return. Verify SRS lamp extinguishes and perform final road/functional checks as required.
If fault persists, consult vehicle-specific service information and consider specialist airbag diagnostic service.

Likely causes

Damaged or shorted squib wiring to driver airbag (most common)
Defective driver airbag module squib
Faulty clock spring causing intermittent contact to steering wheel airbag
Poor ground or harness connector corrosion at RCM

Fault status

⚠️ Status

B0003 — Driver frontal airbag Stage 3 deployment control fault. The RCM has detected an abnormal condition in the Stage 3 squib/deployment circuit; SRS may be disabled for that deployment stage. Inspect squib wiring, connectors, clock spring and RCM power/ground/communications.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.0-3.0 hours