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Home / DTC / B1612 — PS pretensioner squib SHT.to BAT

B1612 — PS pretensioner squib SHT.to BAT

Detailed page for trouble code B1612.

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B1612

MITSUBISHI B — Body

PS pretensioner squib SHT.to BAT

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

Causes

  • Damaged or chafed wiring harness contacting battery positive or fused bus
  • Corroded/loose connector at pretensioner or SRS control module
  • Failed pretensioner squib with internal short to battery
  • Shorted splice, accessory, or aftermarket device tied into the pretensioner circuit
  • Faulty SRS/airbag control module or connector (less common)

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • Possible seatbelt pretensioner disabled or SRS fault messages on scan tool
  • DTC B1612 stored in airbag control module
  • No deployment testing should be performed — SRS system may be inhibited for safety

What to check

  • Read and record all stored SRS/airbag codes with a compatible scan tool
  • Follow manufacturer procedure: disable SRS power (disconnect battery negative and wait the specified period) before any connector/wiring work
  • Visual inspection of passenger seatbelt pretensioner connector and harness for damage, corrosion, pin pushed out, melt or pin-to-pin contact
  • Inspect harness routing near battery, fuse boxes, and body panels for chafing or contact with positive-source wiring
  • Reconnect battery and, with caution and per manufacturer guidance, measure voltage at pretensioner connector (expected: no battery voltage present with ignition off; presence of battery voltage indicates short)
  • Measure resistance of pretensioner squib (with battery disconnected and connector unplugged). Typical low resistance squib value is small (about 2–5 ohms — manufacturer values vary). An apparent near-zero or direct continuity to battery positive indicates a short; open or very high resistance indicates open circuit

Signal parameters

  • Typical pretensioner squib resistance: ~2–5 Ω (varies by model — check OEM spec)
  • Open circuit: >>1 kΩ or OL (no continuity)
  • Short to battery: battery voltage (~11–13.5 V) present at squib connector when circuit should be inactive
  • Continuity to battery positive: near 0 Ω between squib circuit and battery + indicates short to battery

Diagnostic algorithm

  1. Retrieve and record all SRS codes and freeze-frame data with a compatible scan tool.
  2. Follow the vehicle manufacturer's safe SRS power-down procedure (disconnect battery negative and wait the required time) before touching SRS connectors or components.
  3. Perform a careful visual inspection of the passenger pretensioner wiring, connector, seat area routing, and any nearby power wiring or accessories for damage, pinching, or modifications.
  4. Disconnect the passenger pretensioner connector at the seat/module. With battery reconnected (if allowed by procedure) and ignition ON, measure for battery voltage at the pretensioner connector pins. Presence of battery voltage indicates a short to battery upstream.
  5. With battery disconnected, measure resistance of the pretensioner squib from its connector: compare to OEM spec (typical low-ohm value). If resistance is near zero to battery positive or shows continuity to fused power, trace wiring to find the short.
  6. Isolate the harness by disconnecting intermediate connectors and checking sections for continuity to battery positive to localize the short location.
  7. Repair any damaged wiring or connectors (replace harness section or connector, repair with proper crimp/solder and heat-shrink, and restore routing/clamps). Replace the pretensioner if internal short is confirmed or connector/corrosion repair does not clear the fault.
  8. After repairs and reconnection, clear codes with a scan tool, perform SRS system self-tests and verify that the airbag warning lamp operates normally and that B1612 does not return.
  9. If the fault persists after wiring and pretensioner replacement, consider a suspect SRS control module — consult manufacturer service information and perform module-level diagnostics or replacement only per factory procedure.

Likely causes

  • Connector on passenger pretensioner harness contaminated/corroded and making positive contact
  • Wiring insulation rubbed through where routed near battery positive or power distribution
  • Previous improper repair or aftermarket accessories tied to belt pretensioner circuit
  • Pretensioner unit internally shorted (rare but possible)

Fault status

⚠️ Status
Passenger seatbelt pretensioner squib circuit: short to battery detected. SRS control module has logged a fault for the passenger pretensioner. Do not attempt pretensioner deployment tests; perform wiring and connector inspection and repairs per SRS safety procedures.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 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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