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Home / DTC / B1B1B — Left curtain ABG squib short

B1B1B — Left curtain ABG squib short

Detailed page for trouble code B1B1B.

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Code

B1B1B

MITSUBISHI B — Body

Left curtain ABG squib short

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

Causes

  • Short to ground in left curtain airbag squib wiring
  • Damaged or chafed wiring harness near A-pillar/roof rail
  • Corroded or pushed-back connector terminals at the curtain airbag or airbag control module
  • Faulty left curtain airbag squib (internal short)
  • Poor repair/aftermarket work causing pin contact or solder bridges
  • Faulty airbag control module (rare)

Symptoms

  • SRS/Airbag warning lamp illuminated on dash
  • Possible secondary DTCs for curtain or side airbag circuits
  • Left curtain airbag disabled (passenger protection reduced)
  • No obvious vehicle drivability symptoms

What to check

  • Verify SRS lamp ON and retrieve freeze frame/live data with proper scan tool
  • Confirm battery state of charge and stable power before tests
  • Visual inspection of left A-pillar, roof rail, and door opening harness for damage
  • Inspect connectors at left curtain airbag and airbag control module for corrosion, deformation, or loose pins
  • Measure squib circuit resistance with specified service tool or multimeter (after following safety procedures)
  • Check for water intrusion or previous repair evidence in headliner/roof area

Signal parameters

  • Squib circuit resistance: near 0 Ω indicates short; normal squib resistance typically a few ohms (refer to manufacturer spec)
  • Open-circuit (infinite Ω) indicates open; code B1B1B indicates resistance much lower than spec
  • No communication or related module errors may accompany if module detects multiple faults

Diagnostic algorithm

  1. Follow safety procedure: disable SRS power per Mitsubishi service manual (disconnect battery and wait the specified time or use manufacturer's recommended SRS disabling procedure).
  2. Use a compatible diagnostic scanner to confirm code B1B1B, read related codes and live data, then record and clear codes to see if B1B1B returns.
  3. Visually inspect left curtain airbag harness from module to airbag for pinched, chafed, or damaged sections (A-pillar, roof rail, door opening area).
  4. Inspect connectors at the left curtain airbag and the airbag control module for corrosion, bent pins, or pushed-back terminals; reseat connectors and inspect terminals.
  5. With battery disabled and following safety rules, measure resistance of the left curtain squib circuit at the airbag connector and at the module connector. Compare to manufacturer values. A very low resistance (near 0 Ω) indicates a short.
  6. If short is present in harness, isolate by disconnecting intermediate connectors and re-measuring to locate the shorted section.
  7. If harness and connectors check OK, replace the left curtain airbag squib assembly and re-test resistance.
  8. If new airbag does not correct the fault, consider replacing or repairing the airbag control module only after confirming wiring/squib OK (module replacement often requires programming/calibration).
  9. After repair, clear codes and perform system self-check with scan tool; confirm SRS lamp extinguishes and no stored faults remain.

Likely causes

  • Wiring insulation abrasion where harness bends near door/roof
  • Connector contamination (water, corrosion) at curtain airbag connector
  • Connector mis-mating or bent terminal at steering column or module
  • Deployed or previously damaged airbag replaced with faulty unit
  • Short inside the airbag inflator/squib assembly

Fault status

⚠️ Status
Left curtain airbag squib short detected. SRS warning lamp illuminated and left curtain airbag circuit disabled until fault is corrected. Inspect wiring, connectors, and squib assembly.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B1A B1B2B B1B0B B1500
406

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