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Home / DTC / B1461 — FR pretensioner squib open

B1461 — FR pretensioner squib open

Detailed page for trouble code B1461.

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B1461

MITSUBISHI B — Body

FR pretensioner squib open

Brand: MITSUBISHI
Type: B — Body
Views: UK: 16 EN: 23 RU: 23
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Page language: EN

Causes

  • Open wiring or broken conductor in the FR pretensioner circuit
  • Disconnected, corroded or damaged connector at the pretensioner
  • Faulty/removed FR pretensioner (seatbelt pretensioner) assembly
  • Poor crimp or terminal failure in the harness
  • Previous deployment with connector not restored/replaced
  • Fault in Supplemental Restraint System (SRS) control module or internal connector

Symptoms

  • SRS/airbag warning lamp illuminated on instrument cluster
  • DTC B1461 stored in SRS control module memory
  • Front-right seatbelt pretensioner will not activate in a crash
  • Possible related SRS faults or other occupant restraint DTCs

What to check

  • Confirm DTCs and freeze frame data with an appropriate SRS-capable scan tool
  • Visual inspection of FR pretensioner connector and wiring (under seat, seat-track area)
  • Check for signs of previous airbag deployment or repairs
  • Measure continuity/resistance of the pretensioner squib circuit per service manual
  • Wiggle test harness while monitoring SRS data for intermittent changes
  • Inspect ground and connector pins for corrosion, pushed-out terminals or bent pins

Signal parameters

  • Typical pretensioner squib resistance: low value (manufacturer-specific). Expect approx. 0.5–5 ohms for a healthy squib; exact spec should be verified in the Mitsubishi service manual (often ~1–3 Ω).
  • Open circuit = infinite resistance / OL on an ohmmeter
  • Do not apply external voltage to a squib; the firing circuit is high-current and controlled by the SRS module
  • During key‑on self-check the SRS module monitors continuity; no normal operating voltage should be injected into the squib by a technician

Diagnostic algorithm

  1. Read and record all SRS codes with a compatible scan tool; note any related codes.
  2. Follow safety precautions: disable SRS power per manufacturer procedure (disconnect battery negative and wait manufacturer-specified time, or follow service manual isolation steps).
  3. Perform a visual inspection: check the FR pretensioner connector, wiring harness routing under the seat, and related harness grommets for damage or pinched wires.
  4. Disconnect the FR pretensioner connector and inspect terminals for corrosion, bent or pushed-out pins and secure mating.
  5. With battery disconnected and safe per service manual, measure resistance across the pretensioner squib terminals. Compare to factory specification. An open reading (OL) indicates an open squib or broken conductor.
  6. If resistance is within spec, reconnect and back-probe the circuit while monitoring the SRS scan tool for continuity/integrity and perform a wiggle test along the harness to detect intermittent opens.
  7. If open or out-of-spec, trace and repair the wiring: repair broken conductor, replace damaged connector or repair terminals. Use correct crimping and insulation methods.
  8. If wiring and connector check good but resistance still open, replace the FR pretensioner (seatbelt pretensioner) assembly.
  9. After repairs, clear DTCs with the scan tool, perform SRS system self-test and recheck for stored codes. If codes return, consider SRS control module diagnosis per factory procedures.
  10. If repairs include pretensioner replacement, follow manufacturer instructions for installation torque, connector mating, and required system reset or reprogramming.

Likely causes

  • Damaged or chafed wiring to the FR pretensioner (most common)
  • Loose or corroded connector at the pretensioner or under the seat
  • Failed pretensioner squib (open windings) due to previous deployment or internal failure
  • Faulty airbag control module detection circuit (less common)

Fault status

⚠️ Status
SRS warning lamp ON — B1461: Front-right pretensioner squib open detected (open circuit in FR seatbelt pretensioner). Pretensioner may be disabled until repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
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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