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Home / DTC / B1615 — F ABG electronic safing SNS.fail

B1615 — F ABG electronic safing SNS.fail

Detailed page for trouble code B1615.

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Code

B1615

MITSUBISHI B — Body

F ABG electronic safing SNS.fail

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

Causes

  • Faulty front safing (safety/arming) sensor
  • Poor or corroded connector or pin at the sensor or SRS control module
  • Open, short, or intermittent wiring between safing sensor and SRS control unit
  • Water intrusion or physical damage to sensor or harness (after collision or leak)
  • SRS control module internal fault or internal connector corrosion
  • Aftermarket equipment or improper repairs that disturbed sensor/harness or mounting

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • Diagnosis trouble code B1615 stored in SRS control module
  • Possible disablement of front airbag deployment and pretensioner function
  • Vehicle may fail safety inspection or show other related SRS codes
  • No other drivability symptoms in most cases

What to check

  • Retrieve and record all SRS codes with a compliant scan tool; note freeze frame and related codes
  • Visually inspect the front safing sensor(s) and wiring harness for damage, corrosion, loose connectors, or water entry
  • Inspect and secure sensor mounting and connector pins; look for bent pins or pushed-out terminals
  • Check battery voltage and chafe points; low battery or recent jump/clamp events can affect SRS memory — record voltage during test
  • Perform continuity and resistance checks of the sensor harness between the sensor connector and SRS module connector (with battery disconnected where required)
  • Wiggle test wiring while monitoring live data or DTCs for intermittent faults

Signal parameters

  • Safing sensor typically provides a low-voltage analog/digital input to the SRS ECU — exact expected voltage/resistance varies by model (refer to service manual)
  • Common fault indications: open circuit (infinite resistance), short to ground or battery, intermittent/noisy signal, or out-of-spec resistance compared to OEM specification
  • SRS control module should report valid safing sensor status in live data; any ‘no signal’ or ‘invalid’ flags indicate a problem
  • No high-voltage present during tests; observe all SRS safety procedures and remove battery negative if required by procedure

Diagnostic algorithm

  1. Use an SRS-capable scan tool to read and record B1615 and any related codes; note freeze-frame data and live stream values.
  2. Verify current battery voltage and health; restore to normal charge if low. Some SRS faults clear after stable voltage is present.
  3. Visually inspect the front safing sensor connector, harness routing, clips, and mounting for damage, corrosion, or water intrusion.
  4. With ignition off and battery handled per OEM safety steps, disconnect sensor and check connector terminals for corrosion, bent pins, or poor contact; repair or replace terminals as needed.
  5. Measure continuity and resistance of the sensor circuit between sensor connector and SRS control module connector. Compare to service manual specifications. Check for short to ground or battery.
  6. If wiring is good, bench-test or substitute a known-good safing sensor (if available) or replace the sensor and retest.
  7. If sensor replacement does not clear the code, inspect and test the SRS control module connectors and grounds; consider module fault if wiring and sensor pass tests.
  8. After repairs, clear codes with the scan tool, cycle ignition per procedure and verify that the SRS warning lamp goes out and B1615 does not return. If the code returns, escalate to module diagnosis or dealer-level tools/documentation.

Likely causes

  • Damaged or corroded sensor connector or wiring harness (most common)
  • Failed safing sensor (internal electronics degraded)
  • Loose or poor ground/power to the sensor or SRS module
  • Previous improper repair or impact-related damage affecting sensor or mounting

Fault status

⚠️ Status
Front electronic safing sensor circuit malfunction detected by SRS control unit; check safing sensor, connectors, and wiring.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1610 B1614 B1620 B1650 B1102
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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