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Home / DTC / B1609 — PS pretensioner squib short

B1609 — PS pretensioner squib short

Detailed page for trouble code B1609.

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Code

B1609

MITSUBISHI B — Body

PS pretensioner squib short

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

Causes

  • Damaged pretensioner squib (internal short)
  • Frayed or pinched wiring harness causing short to ground or battery
  • Poor or corroded connector at pretensioner or airbag control unit
  • Incorrect repair or after-market component causing wrong wiring
  • Shorted contact in seat connector or junction near B‑pillar
  • Faulty SRS/airbag control module (less common)

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument cluster
  • Possible loss of passenger pretensioner function
  • Vehicle shows stored or pending SRS fault codes
  • No other drivability symptoms in most cases

What to check

  • Confirm presence of B1609 and other related SRS codes with a capable scan tool
  • Visually inspect passenger seat, seatbelt pretensioner, and harness routing for damage, burns, or pinching
  • Inspect connectors at the pretensioner and at the SRS control module for corrosion, bent pins or pushed‑out terminals
  • With battery disconnected and following manufacturer SRS safety procedure, measure continuity and resistance of pretensioner circuit at the connector
  • Check for short to ground or battery by measuring resistance from circuit pin to vehicle ground and to battery + (with harness disconnected)
  • Perform a wiggle test (with safety precautions and vehicle powered as required by procedure) to identify intermittent shorts

Signal parameters

  • Normal pretensioner squib resistance: typically a low value (a few ohms). Expect a small but finite resistance; not open-circuit.
  • Open circuit (infinite Ω) indicates wiring open or disconnected pretensioner.
  • Near 0 Ω or very low resistance to ground/battery indicates a short (consistent with B1609).
  • When short present, SRS control module detects abnormal low resistance and sets B1609; lamp will remain illuminated.
  • Voltage on circuit with ignition ON may be present (powered through SRS unit), but do not probe live squib without following safety procedures.

Diagnostic algorithm

  1. Read and record all stored SRS codes and freeze frame data with an appropriate scan tool.
  2. Follow manufacturer SRS safety procedure: disable SRS power (disconnect battery) and wait required time before touching components.
  3. Visually inspect passenger seat area, seatbelt retractor/pretensioner, and routing for physical damage, heat marks, or pinched wiring.
  4. Disconnect the pretensioner connector and measure resistance of the squib. Compare to expected 'few ohms' value; an extremely low value or short to ground/battery confirms fault.
  5. With connector disconnected, check for continuity between the pretensioner circuit and chassis ground and between the circuit and battery + to locate short to ground or power.
  6. Inspect and test intermediate connectors (under seat, seat base, B‑pillar), repair or replace damaged harness/terminals. Pay attention to wire harness areas that move with seat adjustment.
  7. If wiring and connectors are good and squib resistance is incorrect, replace the pretensioner assembly per manufacturer instructions.
  8. After repairs, clear codes and perform an SRS system self-check with the scan tool. Verify no new codes and that the SRS warning lamp behaves correctly.
  9. If code returns and wiring/squib pass tests, suspect SRS control module fault and consult manufacturer documentation or a specialized SRS technician.

Likely causes

  • Shorted squib element in the passenger seatbelt pretensioner (most likely after deployment or impact)
  • Wiring chafe where harness passes through seat or body (B‑pillar, seat track)
  • Connector terminal corrosion or pin pushed out at the pretensioner plug
  • Installation error after seat removal (pinched wire or misrouted harness)

Fault status

⚠️ Status
Passenger seatbelt pretensioner squib short circuit detected (B1609) — low resistance/short to power or ground in passenger pretensioner circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1600 B1601 B1602 B1605 B1610
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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Code

B1609

Other B — Body

Illuminated Entry Input Short Circuit To Battery

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

Causes

  • Damaged pretensioner squib (internal short)
  • Frayed or pinched wiring harness causing short to ground or battery
  • Poor or corroded connector at pretensioner or airbag control unit
  • Incorrect repair or after-market component causing wrong wiring
  • Shorted contact in seat connector or junction near B‑pillar
  • Faulty SRS/airbag control module (less common)

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument cluster
  • Possible loss of passenger pretensioner function
  • Vehicle shows stored or pending SRS fault codes
  • No other drivability symptoms in most cases

What to check

  • Confirm presence of B1609 and other related SRS codes with a capable scan tool
  • Visually inspect passenger seat, seatbelt pretensioner, and harness routing for damage, burns, or pinching
  • Inspect connectors at the pretensioner and at the SRS control module for corrosion, bent pins or pushed‑out terminals
  • With battery disconnected and following manufacturer SRS safety procedure, measure continuity and resistance of pretensioner circuit at the connector
  • Check for short to ground or battery by measuring resistance from circuit pin to vehicle ground and to battery + (with harness disconnected)
  • Perform a wiggle test (with safety precautions and vehicle powered as required by procedure) to identify intermittent shorts

Signal parameters

  • Normal pretensioner squib resistance: typically a low value (a few ohms). Expect a small but finite resistance; not open-circuit.
  • Open circuit (infinite Ω) indicates wiring open or disconnected pretensioner.
  • Near 0 Ω or very low resistance to ground/battery indicates a short (consistent with B1609).
  • When short present, SRS control module detects abnormal low resistance and sets B1609; lamp will remain illuminated.
  • Voltage on circuit with ignition ON may be present (powered through SRS unit), but do not probe live squib without following safety procedures.

Diagnostic algorithm

  1. Read and record all stored SRS codes and freeze frame data with an appropriate scan tool.
  2. Follow manufacturer SRS safety procedure: disable SRS power (disconnect battery) and wait required time before touching components.
  3. Visually inspect passenger seat area, seatbelt retractor/pretensioner, and routing for physical damage, heat marks, or pinched wiring.
  4. Disconnect the pretensioner connector and measure resistance of the squib. Compare to expected 'few ohms' value; an extremely low value or short to ground/battery confirms fault.
  5. With connector disconnected, check for continuity between the pretensioner circuit and chassis ground and between the circuit and battery + to locate short to ground or power.
  6. Inspect and test intermediate connectors (under seat, seat base, B‑pillar), repair or replace damaged harness/terminals. Pay attention to wire harness areas that move with seat adjustment.
  7. If wiring and connectors are good and squib resistance is incorrect, replace the pretensioner assembly per manufacturer instructions.
  8. After repairs, clear codes and perform an SRS system self-check with the scan tool. Verify no new codes and that the SRS warning lamp behaves correctly.
  9. If code returns and wiring/squib pass tests, suspect SRS control module fault and consult manufacturer documentation or a specialized SRS technician.

Likely causes

  • Shorted squib element in the passenger seatbelt pretensioner (most likely after deployment or impact)
  • Wiring chafe where harness passes through seat or body (B‑pillar, seat track)
  • Connector terminal corrosion or pin pushed out at the pretensioner plug
  • Installation error after seat removal (pinched wire or misrouted harness)

Fault status

⚠️ Status
Passenger seatbelt pretensioner squib short circuit detected (B1609) — low resistance/short to power or ground in passenger pretensioner circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1600 B1601 B1602 B1605 B1610
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