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Home / DTC / B1C3B — DR.pretensioner circuit short

B1C3B — DR.pretensioner circuit short

Detailed page for trouble code B1C3B.

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Code

B1C3B

MITSUBISHI B — Body

DR.pretensioner circuit short

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Short to battery positive or ground in driver pretensioner wiring
  • Damaged or chafed harness near the seat or B-pillar
  • Corroded or loose pretensioner connector pins
  • Failed pretensioner (internal short in the squib/coil)
  • Poor repair or incorrect aftermarket seat/airbag installation
  • Faulty SRS control module or bad connector at the module

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Driver pretensioner disabled; possible loss of pretensioner function in a crash
  • Stored B1C3B with possible additional SRS-related codes
  • Seatbelt buckle or pretensioner-related lights (if applicable)
  • Noisy or intermittent SRS lamp during vehicle motion or after repairs

What to check

  • Read SRS codes and freeze-frame data with a capable scan tool; record all related codes
  • Visually inspect driver seat, seat track, connector under seat and B‑pillar wiring for damage or corrosion
  • Confirm battery voltage is stable before tests; follow OEM SRS power-down procedure
  • Check for previous crash repair evidence or deployed airbag/pretensioner replacement history
  • Inspect SRS fuses and connectors at the SRS control unit
  • Measure resistance of the pretensioner circuit only after isolating connector and following safety steps

Signal parameters

  • Pretensioner squib resistance: typically low — commonly in the range ~0.5–5 ohms depending on model (refer to OEM spec)
  • Open-circuit (infinite resistance) indicates broken/disconnected circuit
  • Short to battery/ground: continuity between pretensioner circuit and battery positive or chassis ground when connector isolated is NOT expected
  • Circuit voltage with ignition ON at pretensioner connector: system reference voltage (~12 V) may be present — follow OEM test procedures
  • No diagnostic current should be applied to a suspected squib except by authorized SRS diagnostic equipment

Diagnostic algorithm

  1. Safety first: disable SRS power per factory procedure (disconnect battery negative and wait specified time or follow manufacturer isolation steps). Use OEM-recommended ESD precautions.
  2. Use a scan tool to read all SRS codes and freeze-frame; note any additional related codes (airbag modules, communication errors).
  3. Visually inspect driver seat area: connectors under seat, seat track, seatbelt pretensioner mounting, and wiring grommets through B‑pillar and floor for chafing, cuts, or pinched wiring.
  4. With SRS power disabled and connector disconnected, measure resistance of the driver pretensioner squib between its terminals. Compare to OEM spec. A very low resistance that shorts to chassis or battery indicates internal squib short; open circuit indicates broken conductor.
  5. Check continuity of each conductor from the pretensioner connector back to the SRS ECU connector. Look for short to ground or battery positive using insulation resistance or continuity tests with harness disconnected from modules.
  6. Inspect and gently wiggle the harness while monitoring continuity to reproduce intermittent shorts. Pay attention to seat movement areas and hinge points.
  7. Inspect connectors for corrosion, bent pins, or poor crimps. Repair or replace damaged pins/terminals and use dielectric grease where appropriate per OEM guidance.
  8. If wiring and connectors check good, swap or bench-test the pretensioner (per OEM safe procedures) or replace with a known-good unit. Do not apply power to a squib except using approved SRS diagnostic tools.
  9. If pretensioner and harness are good but code persists, check SRS control module supply, grounds, and communication lines; consider module fault and follow manufacturer procedures for module testing/replacement.
  10. After repair, clear codes, reconnect SRS power, verify no code returns, and perform any required steering/seatbelt/seat position calibration or system self-tests per OEM procedure.

Likely causes

  • Connector corrosion or bent pins at driver pretensioner
  • Wire insulation worn where harness passes through seat/hinge/ B‑pillar
  • Pretensioner squib internally shorted (low resistance)
  • Short to chassis ground from damaged conductor
  • Faulty SRS ECU reporting erroneous short

Fault status

⚠️ Status
Short detected in driver seatbelt pretensioner circuit. SRS warning lamp active; pretensioner operation may be inhibited until fault is cleared and repair performed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1C3A B1C3C B1A2A B1632 U0123
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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