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Home / DTC / B1C49 — PS.pretensioner circuit open

B1C49 — PS.pretensioner circuit open

Detailed page for trouble code B1C49.

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Code

B1C49

MITSUBISHI B — Body

PS.pretensioner circuit open

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

Causes

  • Disconnected or loose connector at the passenger seat pretensioner
  • Broken, pinched or corroded wiring in pretensioner harness (under seat or in seat belt reel area)
  • Faulty pretensioner squib (open internal winding)
  • Poor ground or power supply to the airbag control module
  • Faulty airbag (SRS) control module or connector
  • Previous deployment damage not repaired correctly

Symptoms

  • SRS / airbag warning lamp illuminated on instrument cluster
  • Passenger pretensioner disabled (no deployment capability)
  • Possible related SRS warnings or seat-belt lamp illumination
  • DTC B1C49 stored in airbag control module

What to check

  • Retrieve and record all SRS codes with an appropriate scan tool
  • Perform a visual inspection of the passenger seat area, pretensioner connector(s) and wiring harness for damage, corrosion or disconnection
  • Check for obvious signs of prior deployment or repair to the seat/pretensioner
  • With power off and following manufacturer SRS safety procedures, measure continuity and resistance of the pretensioner squib circuit
  • Verify connector pins are straight and terminals are making good contact
  • Check wiring harness routing through seat rails and belt retractor for chafing or breaks

Signal parameters

  • Pretensioner squib continuity: expected low-ohm resistance (single-digit ohms) vs open/infinite for an open circuit
  • No voltage should be present across squib when system is not commanded; module supplies firing voltage only during deployment
  • SRS module reports circuit status (open/short) via diagnostic tool
  • Connector pin resistance/continuity between pretensioner connector and module connector

Diagnostic algorithm

  1. Read and record SRS fault codes and freeze frame with a compatible diagnostic tool.
  2. Follow manufacturer SRS safety procedures: disable SRS power (disconnect battery) and wait the recommended time before touching connectors or the squib circuit.
  3. Visually inspect passenger seat, buckle, pretensioner connector, and wiring for damage, corrosion, or disconnection; repair any obvious issues.
  4. Locate the pretensioner connector (usually under the seat) and check for proper seating and pin condition; reseat connectors.
  5. With power still disabled, measure squib circuit continuity between pretensioner connector and airbag control module; an open result indicates a break in wiring or an open squib.
  6. If open, isolate by testing continuity segment-by-segment (connector-to-connector, through seat harness, through reel if applicable) to find the fault location.
  7. If wiring and connectors are good but circuit still open, measure pretensioner resistance at the squib leads; replace pretensioner if internal open is confirmed.
  8. Repair or replace damaged wiring, connectors, or the pretensioner as required. Replace or repair any module connector faults.
  9. After repairs, reconnect power, clear codes, and perform SRS system self-tests and a road test if specified. Confirm code does not return.
  10. If code persists after wiring and pretensioner replacement, inspect or test the airbag control module and its outputs; consult service manual for module bench-test or replacement procedures.

Likely causes

  • Loose/disconnected connector under passenger seat (most common)
  • Damaged wiring where harness flexes with seat movement
  • Open pretensioner squib due to age or prior deployment
  • Connector corrosion or bent terminal preventing continuity

Fault status

⚠️ Status
Passenger pretensioner circuit open — continuity lost in PS pretensioner (squib) wiring. SRS warning lamp on; pretensioner disabled until fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1C48 B1C4A B1C4B B1620 B1611
406

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