Code
B1C28
MITSUBISHI
B — Body
Left side ABG squib high
Views:
UK: 26
EN: 29
RU: 19
AI status
Completed
Completed
100%
Causes
- Open circuit or very high resistance in the left side squib wiring
- Corroded/poor/loose connector at the squib or ECU
- Damaged wiring harness (pinch, chafe, broken conductor) — common at seat or door hinge
- Faulty left side airbag module (squib element) with high internal resistance
- Faulty SRS control unit or connector
- Recent repairs or aftermarket installations (seat, wiring, audio) disturbing the harness
Symptoms
- SRS / airbag warning lamp illuminated on dash
- Left side airbag disabled (no deployment) until repaired
- Diagnostic trouble code B1C28 stored in SRS ECU
- Possible intermittent warning if connection is intermittent
What to check
- Read and record DTCs and freeze frame data with an appropriate SRS scan tool
- Observe SRS lamp behavior (lamp on, flashing, or steady) and any secondary codes
- Visually inspect left side airbag connector and harness for damage, corrosion, loose pins
- Check for recent work in seat/door area that could have disturbed wiring
- Follow SRS safety procedures before any physical testing (battery disconnect and recommended wait time)
Signal parameters
- Typical squib resistance (manufacturer-specific) — commonly ~1–5 ohms for a healthy squib
- Resistance indicating 'high' or open: significantly above spec, often >7–10 ohms or infinite (open circuit)
- No battery voltage should be applied to the squib during measurement; measure resistance only with SRS power disabled
- Scan tool live data may show open/high status or fault flag rather than conventional voltage/current values
Diagnostic algorithm
- Safety first: disable SRS system per Mitsubishi procedure — disconnect battery negative and wait specified time (commonly ≥2–10 minutes) before touching connectors. Use manufacturer service manual.
- Connect OEM-level SRS scan tool. Read and record DTCs, freeze frame, and SRS self-test results.
- Visually inspect left side airbag connector (seat or door) and wiring for damage, corrosion, bent pins, or disconnection. Repair any obvious issues.
- With SRS power still disabled, disconnect the left side airbag connector and measure squib resistance across its two squib terminals using a digital multimeter. Compare to factory spec. If resistance is very high or OL, squib or wiring open likely.
- Check continuity from the squib connector back to the SRS ECU connector to locate opens. Wiggle harness at seat tracks/hinges while monitoring continuity to find intermittent faults.
- If resistance is within spec at the airbag connector, measure resistance at the SRS ECU end to isolate harness. Repair or replace damaged wiring/connector as required.
- If wiring and connectors test good but resistance remains out of spec, replace the left side airbag module (squib).
- After repairs, reconnect everything, restore SRS power, clear codes with scan tool, and perform SRS system check/initialization per service manual.
- If code returns after correct repair, suspect SRS control unit fault and consider ECU inspection or replacement following further diagnostics.
Likely causes
- Open or intermittent connection at the seat/door squib connector
- Broken conductor in harness where it flexes with the seat or door
- Corroded terminal(s) at the airbag connector
- Failed left side airbag module (internal squib resistance increased)
Fault status
Status
Left side airbag squib circuit: high resistance or open detected. SRS warning light set; left side airbag circuit may be disabled until fault is cleared and repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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