Code
B1C2A
MITSUBISHI
B — Body
Left side ABG squib short
Views:
UK: 23
EN: 30
RU: 26
AI status
Completed
Completed
100%
Causes
- Short circuit in left-side airbag (squib) wiring (pin-to-pin or pin-to-ground)
- Corroded or damaged airbag connector (water intrusion, bent pins)
- Faulty left side airbag module (squib assembly) with internal short
- Short in wiring harness (chafing, pinched cable, repair splice error)
- Faulty or damaged SRS/airbag control unit or connector
Symptoms
- SRS/Airbag warning lamp illuminated or flashing
- Side airbag disabled (SRS indicator may show a fault)
- Possible loss of occupant classification / seatbelt pretensioner status for that side
- Vehicle may refuse certain SRS-related self-tests or show other SRS codes
What to check
- Read stored SRS codes and freeze frame with a suitable scan tool (manufacturer recommended)
- Visually inspect left-side airbag connector and wiring for corrosion, damage, or loose pins
- Check for water intrusion or body seam corrosion near the connector or harness routing
- Measure squib circuit resistance at the airbag connector with ignition off and battery disconnected
- Check for continuity and shorts to chassis ground or battery power in the squib harness
- Inspect harness routing through doors, seats, B-pillars and under trim for chafing or pinching
Signal parameters
- Normal squib resistance (typical): approximately 1.5–3.5 ohms (varies by vehicle and squib type)
- Short condition: measured resistance near 0 ohms or significantly below expected squib resistance
- Open condition: very high resistance or infinite (no continuity)
- Supply/monitor voltage: one side of circuit may show battery voltage with key on; measure only per service manual
Diagnostic algorithm
- Safety first: disable SRS power per the manufacturer service manual (disconnect battery negative terminal and wait the specified time before touching SRS components).
- Use a proper scan tool to confirm code B1C2A and clear codes to see if it immediately returns; record any freeze-frame data.
- Perform a visual inspection of the left-side airbag connector, seat/door/pillar harness, and any related harness grommets for damage, corrosion, or water ingress.
- With battery disconnected and following safety wait time, measure the resistance of the left-side squib at the airbag connector. Compare to manufacturer specification (typical ~1.5–3.5 ohms).
- Check for shorts to ground or power: measure resistance between the squib wire(s) and chassis ground, and between squib wire(s) and battery positive, looking for unintended low resistance paths.
- Isolate the circuit: unplug the airbag connector at the module and at the airbag, and test each section of harness to locate the short (module side vs. airbag side).
- Inspect and wiggle harness while monitoring resistance or continuity to reproduce intermittent shorts; pay attention to door hinge, seat adjusters, and B-pillar flex areas.
- If harness and connectors test good, replace or inspect the left-side airbag assembly (squib). Do not attempt to modify or repair squib internals—replace the airbag if suspect.
- If harness and airbag are good, inspect SRS control module connector and module for damage. Test or replace the module only following manufacturer procedures.
- After repairs, reconnect battery, clear codes with a scan tool, and verify the SRS system returns to normal. Do not attempt to deploy or test squibs with improvised methods.
Likely causes
- Connector contamination or bent pins at left-side airbag connector
- Wiring chafe through in door/seat/pillar harness causing short to chassis ground
- Left-side airbag inflator/squib internal short (rare but possible)
- Incorrect previous repair/splice causing low resistance path
- Water intrusion into side airbag connector or seat harness
Fault status
Status
Left-side airbag squib circuit short detected (B1C2A). SRS control unit has logged a low-resistance/short condition on the left squib circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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