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Home / DTC / B0151 — Driver frontal airbag circuit malfunction

B0151 — Driver frontal airbag circuit malfunction

Detailed page for trouble code B0151.

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B0151

Generic B — Body

Driver frontal airbag circuit malfunction

Brand: Generic
Type: B — Body
Views: UK: 9 EN: 8 RU: 12
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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

  1. Connect an airbag-capable scan tool; read and record B0151 and any other SRS codes and freeze-frame data.
  2. Follow safety protocol: switch off ignition, disconnect negative battery terminal, and wait the manufacturer-recommended time before working on SRS wiring (commonly ~10 minutes).
  3. Visually inspect the driver airbag connector (usually in steering wheel), clock spring/spiral cable, and harness for damage, corrosion, or loose pins.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. After repairs, reconnect battery, clear codes with scan tool, and perform SRS system self-tests. Verify B0151 does not return and SRS light extinguishes.
  10. If code persists after repairs, consult OEM-specific service manual and technical service bulletins; consider professional SRS specialist diagnostics.

Likely causes

  • Clock spring (steering column spiral cable) failure
  • Loose/corroded connector at the driver airbag or SRS module
  • Damaged or chafed wiring harness to the driver airbag
  • Faulty driver airbag squib (internal short or open)
  • Faulty SRS control module or poor ground connection

Fault status

⚠️ Status
B0151 — Driver frontal airbag circuit malfunction. SRS warning light illuminated. Service required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B0152 B0141 B0101 B0171 U0073
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