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Home / DTC / B1B0B — PS.ABG squib(1) short

B1B0B — PS.ABG squib(1) short

Detailed page for trouble code B1B0B.

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Code

B1B0B

MITSUBISHI B — Body

PS.ABG squib(1) short

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

Causes

  • Short circuit in squib wiring (short to ground or between conductors)
  • Damaged or corroded connector at the squib or airbag module
  • Faulty squib (airbag inflator or seat belt pretensioner) with internal short
  • Faulty airbag control module / SRS ECU output driver
  • Incorrect repair or poor splice/aftermarket equipment causing short
  • Water intrusion or contamination in connector or harness

Symptoms

  • SRS / airbag warning lamp illuminated
  • Possible disablement of passenger airbag or seatbelt pretensioner functions
  • Diagnostic trouble code B1B0B stored in SRS control unit
  • Vehicle may refuse to clear the warning until fault is fixed

What to check

  • Read and record SRS fault code(s) and freeze frame / failure records with a compatible scan tool
  • Inspect passenger-side airbag/pretensioner connector(s) and wiring for damage, corrosion, or water entry
  • Visually inspect seat tracks, seat belt anchors, and harness routing for chafing or pinched wires
  • Measure squib circuit resistance (with SRS system disabled per manufacturer instructions) and compare to expected range
  • Check for low-impedance short to ground or between squib conductors using continuity/ohmmeter
  • Verify correct connector mating (no pushed-out pins) and secure locking tabs

Signal parameters

  • Expected squib resistance (typical): approx. 2–5 ohms for many inflator/pretensioner squibs; manufacturer spec required
  • Short condition: measured resistance near 0 ohms or much lower than factory spec
  • Open condition: very high resistance or infinite (open circuit)
  • Connector pin voltage (with ignition ON and SRS powered diagnostics): follow manufacturer procedure; do not attempt live firing checks
  • Scan-tool DTC: B1B0B set when control unit detects abnormally low circuit resistance

Diagnostic algorithm

  1. Safety first: follow manufacturer SRS safety procedures. Disable SRS power (disconnect battery and wait the manufacturer-specified interval) before disconnecting airbag or pretensioner connectors.
  2. Use a compatible scan tool to confirm B1B0B and any related SRS codes. Record freeze-frame data and any additional fault codes.
  3. Visually inspect passenger-side airbag/pretensioner connectors, harness, seat area, and related components for damage, corrosion, or contamination. Pay attention to wiring under the seat and through the B-pillar.
  4. With SRS system made safe per manufacturer instructions, disconnect the squib connector and measure resistance across the squib terminals. Compare to factory spec. A very low resistance suggests an internal squib short.
  5. Measure resistance/continuity from squib connector pins to chassis ground and to the SRS ECU pins. Look for unintended shorts to ground or between conductors.
  6. If harness shows short to ground, isolate by disconnecting intermediate connectors and measuring sections until the shorted segment is found. Repair or replace damaged wiring or connectors.
  7. If wiring and connectors check good and squib resistance is out of spec (low), replace the affected squib component (airbag inflator or pretensioner) per manufacturer procedure.
  8. If squib and wiring appear correct but DTC persists, inspect and test the SRS control module output driver or have it tested/replaced by a qualified specialist.
  9. After repairs, clear codes with scan tool, power-cycle SRS per procedure, and verify no codes return. Perform full SRS system functional checks as required.

Likely causes

  • Chafed harness where wires contact body/chassis causing short to ground
  • Bent or pushed-pins in passenger-side airbag/pretensioner connector
  • Recent seat, seatbelt, or interior work that disturbed the harness/connectors
  • Failed squib in passenger airbag or pretensioner assembly

Fault status

⚠️ Status
B1B0B — PS.ABG squib (1) short: SRS control unit detected abnormally low resistance (short) in the passenger-side airbag/pretensioner squib circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B0A B1B0C B1B1B B1A0B U0121
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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