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Home / DTC / B1C27 — Left side ABG squib low

B1C27 — Left side ABG squib low

Detailed page for trouble code B1C27.

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Code

B1C27

MITSUBISHI B — Body

Left side ABG squib low

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/crushed wiring or chafed insulation in left side airbag harness
  • Poor or corroded connector at the left airbag squib or ECU
  • Short to chassis ground or battery (low resistance path) in the squib circuit
  • Faulty left side airbag (squib) module/inflator
  • Faulty SRS/airbag control module or internal driver fault
  • Previous improper repair or aftermarket equipment interfering with circuit

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • Left side airbag disabled by control module (may set additional related codes)
  • Possible stored history codes for related circuits
  • No deployment; warning lamp remains after ignition cycles

What to check

  • Read and record freeze frame and full SRS code list with a capable scan tool
  • Visually inspect left side airbag wiring, connectors, seat harness and B-pillar routing for damage, corrosion or pinching
  • Check connector mating surfaces for corrosion, bent pins, or pushed-out terminals
  • Confirm battery voltage is stable and battery connections are clean before SRS work
  • Follow vehicle service manual safety procedure: disable SRS power (battery disconnect and wait period) before probing or disconnecting airbag connectors

Signal parameters

  • Expected squib resistance (typical, model dependent): roughly 1–5 ohms for a good side airbag squib (consult vehicle service data for exact spec)
  • Open-circuit: very high resistance (>>1000 ohms) — indicates open fault
  • Short-to-ground/low: near 0 ohms — indicates short or damaged squib wiring
  • Voltage/current should only be checked with proper SRS diagnostic tool and following safety procedures; do not attempt to trigger/deploy an airbag

Diagnostic algorithm

  1. Record codes and freeze-frame data with an SRS-capable scan tool; note related DTCs.
  2. Disable SRS system per service manual (disconnect battery negative, wait specified time).
  3. Visually inspect left side seat area, connectors, seat belt pretensioner, B-pillar and floor harness for damage or corrosion.
  4. With SRS disabled, disconnect the left side airbag connector and measure resistance across the squib pins at the airbag module end; compare to manufacturer's spec. (If resistance is very low ~0–0.5 ohm, suspect short; if very high/OL, suspect open).
  5. If squib resistance is out of spec, trace wiring toward the SRS control module; perform continuity and short-to-ground tests on harness sections to locate short/damage.
  6. Inspect and test connector pins and terminals; repair or replace damaged terminals and connectors as needed.
  7. If wiring and connectors are good and squib resistance at the airbag is out of spec, replace the left side airbag/squib assembly per safety procedures.
  8. If squib and wiring are good, suspect SRS control module driver fault; verify by substitute module or professional module bench test if available.
  9. After repairs, clear codes with scan tool, perform SRS system self-test and confirm no DTCs return and lamp extinguishes.
  10. Always follow manufacturer instructions for handling and disposing airbag modules; don’t attempt repairs that involve deployment or modification of the inflator.

Likely causes

  • Wiring short to ground at seat harness or B-pillar
  • Bent or contaminated airbag clock spring (if applicable to left side)
  • Loose or corroded connector pins at the squib or SRS module
  • Damaged airbag connector under the seat (seat-belt pretensioner area)

Fault status

⚠️ Status
Left-side airbag squib circuit indicates abnormally low resistance/low condition. SRS warning light set; left side airbag may be inhibited until fault cleared and repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1C26 B1C24 B1C2A B1C2B
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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