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Home / DTC / B1490 — F ABG(2)PS squib short

B1490 — F ABG(2)PS squib short

Detailed page for trouble code B1490.

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Code

B1490

MITSUBISHI B — Body

F ABG(2)PS squib short

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

Causes

  • Damaged or chafed wiring in the passenger squib circuit (short to ground or to battery)
  • Corroded or loose connector at the passenger airbag/squib or SRS control unit
  • Faulty passenger airbag module or squib (internal short)
  • Poor repair after previous deployment (incorrect wiring or damaged components)
  • Faulty SRS (airbag) control unit or internal driver failure
  • Aftermarket accessories (seat heaters, alarms) incorrectly installed and interfering with squib circuit

Symptoms

  • Illuminated SRS/airbag warning lamp on instrument cluster
  • Passenger airbag indicator may show disabled or not operational
  • SRS system self-check fails and may disable deployment of affected airbag
  • Possible stored related SRS diagnostic trouble codes in control module

What to check

  • Retrieve stored SRS codes and freeze-frame data with a compatible scanner
  • Visual inspection of passenger seat area, connectors, and wiring harness for damage, corrosion, or water
  • Check connector at passenger airbag and at SRS control unit for secure fit and bent pins
  • Measure resistance of passenger squib circuit with ignition off and battery disconnected (compare to spec)
  • Check for short to ground or short to battery on squib circuit using ohmmeter/short finder
  • Inspect seat rails and connectors for pinching or chafing from seat movement

Signal parameters

  • Battery voltage on SRS power lines: approx. 12–14 V with ignition ON (normal power rail)
  • Passenger squib circuit static resistance (typical): low ohms range (commonly ~2–5 ohms for squib assemblies) — consult factory spec
  • Open-circuit: very high resistance/OL if squib disconnected or open; short to ground: near 0 Ω
  • Short-to-battery: squib circuit shows near 0 Ω to B+ when measuring to battery positive
  • During normal operation the SRS unit fires a discharge pulse (do NOT attempt to trigger during diagnostics)

Diagnostic algorithm

  1. Safety first: Disable SRS power per manufacturer procedure — disconnect negative battery terminal and wait the specified time (typically several minutes) before touching SRS components. Consult the service manual.
  2. Read and record all SRS codes and freeze-frame data with an appropriate diagnostic tool. Note any other related codes.
  3. Visually inspect passenger seat, connector backshells, harness routing, and seat rail areas for damage, corrosion, water, or pinched wires.
  4. With battery still disconnected, disconnect the passenger airbag/squib connector. Measure resistance across the squib pins. Compare to factory spec. A very low resistance to chassis ground indicates a short to ground; a very low resistance to battery positive indicates a short to power.
  5. Perform continuity checks from the squib connector back to the SRS control unit pin to find wiring faults. Wiggle the seat and harness while monitoring continuity to reproduce intermittent shorts.
  6. Inspect and test connectors at the SRS control unit for corrosion, bent pins, or water intrusion. Repair or replace damaged connectors or terminals.
  7. If wiring and connectors check OK, consider replacing the passenger airbag assembly/squib (especially if resistance values are out of spec or there is evidence of internal shorting).
  8. If component replacement performed, clear codes, reconnect battery, and perform SRS system scan. Verify no recurrence of the B1490 code and that SRS lamp extinguishes after self-check.
  9. If code persists after repairing wiring and replacing components, suspect a faulty SRS control unit and verify its inputs/outputs per factory procedures before replacement.

Likely causes

  • Shorted conductor in harness under or near passenger seat (pinched by seat rails)
  • Connector pin corrosion or bent pin at the passenger airbag connector
  • Seatbelt pretensioner/squib or passenger airbag assembly internal short
  • Water ingress into connector or seat area causing shorts
  • Damaged insulation from previous work (seat removal/installation)

Fault status

⚠️ Status
Front passenger squib circuit short detected (short to battery or ground) — SRS control unit fault code B1490.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1491 B1801 B1830 B1520 B1100
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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