Code
B1B02
MITSUBISHI
B — Body
DR.ABG squib(1) open
Views:
UK: 16
EN: 22
RU: 20
AI status
Completed
Completed
100%
Causes
- Failed driver airbag (squib) connector or broken wire (open circuit)
- Faulty clockspring/spiral cable (open inside)
- Poor/cracked connector pins or corrosion at connector
- Disconnected or damaged airbag module
- Faulty SRS airbag ECU or connector
- Previous repair damage to wiring harness (pins pushed out)
Symptoms
- SRS/Airbag warning lamp illuminated on instrument cluster
- Possible disablement of driver airbag (no deployment in crash)
- Steering wheel controls (if on clockspring) may be intermittent or inoperative
- Diagnostic trouble code B1B02 stored in SRS ECU
What to check
- Verify SRS warning lamp behavior on key-on/self-check
- Retrieve and record all SRS codes with an appropriate scan tool
- Visually inspect driver airbag connector and wiring for damage, corrosion, or disconnection
- Inspect clockspring/spiral cable for damage or play
- Check connector pins at SRS ECU for pushed-out or corroded pins
- Measure continuity and resistance of squib circuit with SRS-safe procedures (see signal parameters)
Signal parameters
- Expected squib resistance (intact): typically about 2–5 ohms (manufacturer-specific)
- Open circuit: OL / infinite ohms (code sets when open detected)
- Short to ground: near 0 ohms (different code if short present)
- SRS lamp: ON steady when fault present
- Scan tool fault status: B1B02 set when driver squib (1) open
Diagnostic algorithm
- Safety first: follow manufacturer SRS safety procedure. Disconnect negative battery terminal and wait the recommended time (refer to Mitsubishi service manual) before touching SRS components.
- Connect an SRS-capable scan tool. Read and record all codes, freeze frames, and SRS ECU data. Clear codes and see if B1B02 returns.
- Visually inspect the driver airbag connector (in steering wheel) and the wiring to the clockspring for damage, corrosion, or disconnected pins.
- With battery disconnected and following safety procedure, disconnect the driver airbag connector and inspect pins for damage or corrosion. Reconnect securely.
- Measure resistance of the driver squib circuit between the airbag connector terminals and at the SRS ECU connector (use specified service connector points where available). Compare to expected (approx. 2–5 ohms). Open/infinite indicates circuit open.
- If resistance is open at steering wheel connector but normal at ECU connector, suspect clockspring or broken wire in steering column. Remove/replace clockspring as per manual and recheck.
- If resistance is open at ECU connector, trace wiring harness to locate break, open splice, or disconnected connector. Repair wiring with correct crimp/repair and insulation, then retest.
- If wiring continuity is good but squib still reads open at both ends, replace driver airbag module and recheck resistance or follow manufacturer module replacement procedure.
- After repairs, reconnect everything, clear codes with the scan tool, perform self-tests and confirm SRS lamp extinguishes and no B1B02 returns. Road test only for non-SRS functions; never attempt to verify SRS deployment by simulated crash.
Likely causes
- Open wiring between driver airbag and SRS ECU (most common)
- Faulty clockspring causing open circuit when steering turned
- Damaged connector at base of steering column
- Failed driver airbag module (internal open squib)
Fault status
Status
Open circuit detected in driver airbag squib (squib 1) circuit. SRS warning lamp illuminated; driver airbag deployment inhibited until fault is repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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