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Home / DTC / B2620 — Front Airbag Squib Circuit Open/Short

B2620 — Front Airbag Squib Circuit Open/Short

Detailed page for trouble code B2620.

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B2620

Generic B — Body

Front Airbag Squib Circuit Open/Short

Brand: Generic
Type: B — Body
Views: UK: 1 EN: 0 RU: 0
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Page language: EN

Causes

  • Open circuit in squib wiring (broken wire, poor crimp, disconnected connector)
  • Short to ground or short to battery voltage on the squib circuit
  • Corroded or pushed-out connector pins at the airbag or module
  • Faulty airbag (squib) assembly or deployed squib
  • Faulty restraint control (SRS) module or internal driver
  • Faulty clock spring (for driver front airbag) or seat wiring (for passenger)

Symptoms

  • SRS / Airbag warning lamp illuminated on instrument cluster
  • Possible disablement of front airbag deployment
  • Vehicle may fail periodic SRS self-test or show other related SRS codes
  • Diagnostic trouble code B2620 stored in SRS module

What to check

  • Use an OBD-II / SRS-capable scan tool to read SRS codes, freeze frame, and live data
  • Visually inspect connectors and wiring at the driver and passenger front airbag and at the SRS module
  • Check for aftermarket accessories or recent work that may have disturbed wiring
  • Confirm vehicle battery is fully charged before diagnostics
  • Observe all safety precautions for SRS systems (battery disconnect and specified wait time before work)

Signal parameters

  • Typical intact squib resistance: approximately 2–5 ohms (varies by manufacturer). Refer to service manual for exact value
  • Open circuit: very high or infinite resistance
  • Shorted circuit: near 0 ohms (low resistance) or continuity to vehicle ground/12V
  • During deployment the module supplies a short high‑current pulse — never attempt to reproduce a deployment signal with test equipment

Diagnostic algorithm

  1. Safety first: Disable SRS power per manufacturer procedure (disconnect battery negative and wait the specified time, typically 5–15 minutes, before touching SRS connectors). Follow all safety and ESD precautions.
  2. Read and record all SRS codes and freeze frame data with a capable scan tool. Note whether the code points to driver or passenger front squib circuit.
  3. Visually inspect both front airbag connectors, steering column/clock spring area (driver), passenger knee/seatbelt area, and the SRS module for loose pins, corrosion, pushed-out terminals, rodent damage, or recent repair work.
  4. With the SRS power disabled and connectors disconnected from the squib, measure resistance of the airbag squib at the airbag connector using an accurate ohmmeter. Compare to service specification (approx. 2–5 ohms typical).
  5. Measure resistance at the SRS module connector for the same circuit to determine if fault lies between module and airbag. If readings differ, perform continuity tests along the harness and backprobe connectors (with power disabled).
  6. Perform wiggle/isolated connector tests while monitoring resistance or scan tool live data to locate intermittent opens or shorts. Recheck connectors and terminals for proper seating.
  7. Inspect and test the clock spring if the driver airbag circuit is affected (replace if resistance out of range or if broken internal traces found).
  8. Check for shorts to battery or ground by isolating sections of the circuit and measuring continuity to chassis ground or battery positive with power removed.
  9. If wiring and connectors are good but resistance is out of specification at both ends, replace the affected airbag squib assembly (do not attempt to repair squib).
  10. If wiring and airbag check good, consider SRS module fault — consult manufacturer procedures for module bench test/repair or replacement.
  11. After repair, reconnect SRS power, clear codes with a scan tool, perform SRS self-test, and confirm the DTC does not return. Follow any required post-repair procedures (calibrations, seat occupancy/reset steps).

Likely causes

  • Damaged or chafed wiring harness in steering column or dash
  • Disconnected or corroded connector at airbag or module
  • Worn/failed clock spring (if driver airbag indicated)
  • Shorted pin at connector due to bent terminal
  • Airbag module or squib failure after partial or full deployment

Fault status

⚠️ Status
Front airbag squib circuit open or short detected. SRS control module has logged a fault in a front squib circuit; airbag deployment for that circuit may be disabled until repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2621 B2610 B2630 B2625 U0121
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