B0151

Code

Generic B — Body

Driver frontal airbag circuit malfunction

Brand: Generic

Type: B — Body

Views: UK: 18 EN: 22 RU: 19

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Page language: EN

Causes

Open circuit (broken wire, disconnected connector) in the driver airbag squib circuit
Short to ground or short to battery/ignition in the squib wiring
High resistance at connectors, terminals, or due to corrosion
Faulty clock spring/spiral cable in the steering column
Defective driver airbag module (squib)
Blown SRS fuse or poor battery/ground connection

Symptoms

SRS/Airbag warning light illuminated on instrument panel
Possible disablement of driver airbag (airbag will not deploy if fault present)
Diagnostic trouble code B0151 stored in SRS module
Intermittent SRS warning or lamp goes out after driving then returns
Vehicle may fail periodic safety inspections due to SRS lamp

What to check

Read and record all SRS codes and freeze-frame data with an airbag-capable scan tool
Visually inspect driver airbag connector, wiring, steering column area, and SRS module for damage or corrosion
Verify SRS system fuse(s) and main battery/ground connections
Follow safety procedure: disable battery negative and wait manufacturer-specified time before probing (commonly ~10 minutes)
Measure continuity/resistance of the driver airbag squib circuit at the airbag connector and at the SRS module connector
Perform wiggle test of wiring/clock spring while monitoring resistance or scanning for intermittent faults (only with battery disconnected when probing)

Signal parameters

Typical driver airbag squib resistance usually low (commonly around 0.5–5 ohms depending on vehicle); consult OEM spec for exact value
Open circuit: infinite/OL on resistance measurement
Short to ground: near 0 ohms; short to battery/ignition: near 0 ohms to +12V when measured to battery
Voltage at airbag connector while ignition on: normally not driven for measurement—do not apply battery power to squib; use passive voltage checks only per OEM procedures
SRS control module should report normal driver squib circuit status when circuit resistance is within OEM spec

Diagnostic algorithm

Connect an airbag-capable scan tool; read and record B0151 and any other SRS codes and freeze-frame data.
Follow safety protocol: switch off ignition, disconnect negative battery terminal, and wait the manufacturer-recommended time before working on SRS wiring (commonly ~10 minutes).
Visually inspect the driver airbag connector (usually in steering wheel), clock spring/spiral cable, and harness for damage, corrosion, or loose pins.
With battery still disconnected, measure resistance between the two squib terminals at the driver airbag connector; compare to OEM specification. An open or out-of-spec reading indicates squib, connector, or wiring fault.
Measure continuity between the airbag connector and the SRS control module connector to localize wiring breaks. Check for shorts to ground or battery using continuity/insulation tests.
If resistance is high or intermittent, disconnect and inspect connectors; repair pin damage, corrosion, or broken wires. Replace clock spring if continuity is lost through it or if steering wheel controls fail.
If wiring and clock spring test good, consider replacing the driver airbag module (squib) only if measured resistance indicates internal fault and OEM replacement procedures permit.
If wiring, connectors, clock spring, and squib are good, inspect SRS control module grounds and communication lines; update or replace module only per OEM guidance.
After repairs, reconnect battery, clear codes with scan tool, and perform SRS system self-tests. Verify B0151 does not return and SRS light extinguishes.
If code persists after repairs, consult OEM-specific service manual and technical service bulletins; consider professional SRS specialist diagnostics.