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Home / DTC / B1485 — F ABG(2)DR active circuit open

B1485 — F ABG(2)DR active circuit open

Detailed page for trouble code B1485.

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Code

B1485

MITSUBISHI B — Body

F ABG(2)DR active circuit open

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

Causes

  • Open or broken wiring in driver airbag squib circuit
  • Disconnected, loose or corroded airbag/connector at steering wheel or SRS ECU
  • Faulty/failed driver airbag module (squib) or seat belt pretensioner
  • Damaged or defective clock spring/spiral cable in steering column
  • Poor ground or short-to-open condition in harness after repairs or collision
  • SRS control unit fault or internal connector failure

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument cluster
  • Possible disablement of driver airbag and seat belt pretensioner
  • DTC B1485 stored in SRS control unit
  • In some systems, related faults or interlocks preventing vehicle from normal safety diagnostics

What to check

  • Read SRS module with a capable scan tool; record DTC and freeze frame data and any related codes
  • Visually inspect steering wheel, steering column, and under-dash areas for damaged wiring, disconnected connectors, or corrosion
  • Inspect connector mating faces at driver airbag and SRS ECU for bent pins or contamination
  • Check for recent service or aftermarket accessories that may have disturbed the steering wiring or clock spring
  • Confirm proper battery voltage and that no recent battery disconnection occurred without following SRS procedures

Signal parameters

  • Expected squib resistance: low ohms (typical driver airbag squib ≈1–4 Ω; consult OEM spec)
  • Open-circuit result: infinite resistance or OL on meter between squib pins and SRS ECU
  • When ignition ON and system in diagnostic mode, SRS ECU expects continuity; an open registers as fault condition
  • Do not measure squib resistance without following OEM safety procedure (battery disconnect and specified wait time)

Diagnostic algorithm

  1. Safety first: follow manufacturer SRS safety procedure — disconnect battery negative terminal and wait the specified time before touching airbag connectors or squib wiring
  2. Connect an OEM-capable scan tool. Confirm B1485 is present, note freeze frame, then clear codes and attempt to reproduce to verify persistence
  3. Visually inspect steering wheel and column area for damaged harness, pinched wires, aftermarket installations, and connector condition at the driver airbag and clock spring
  4. With battery disconnected and following wait period, disconnect driver airbag connector and measure squib resistance at the airbag module connector. Compare to OEM spec (open/OL indicates open circuit)
  5. If squib resistance at module is normal, perform continuity check from SRS ECU connector to driver airbag connector to locate open in harness; wiggle steering to check for intermittent opens (with battery disconnected)
  6. If continuity fails through the clock spring area, inspect or replace the clock spring/spiral cable assembly per factory procedure
  7. Repair or replace damaged wiring, connectors, clock spring, or airbag module as indicated. Use only OEM replacement SRS components
  8. After repair, reconnect battery, use scan tool to clear codes, run SRS self-check and confirm B1485 does not return. Verify all SRS related lamps and system status normal
  9. If fault persists with wiring and modules confirmed good, inspect/replace SRS control unit per manufacturer instructions

Likely causes

  • Broken wire in steering column harness (common after steering work)
  • Faulty clock spring causing open circuit to driver squib
  • Disconnected connector at driver airbag module after removal/replacement
  • Corroded terminal or connector causing loss of continuity

Fault status

⚠️ Status
Front airbag (driver) active circuit open — SRS control unit detects no continuity in ABG(2) driver squib circuit. Fault stored when circuit resistance exceeds allowed threshold or is open.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1480 B1481 B1482 B1486 B1490
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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