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Home / DTC / B1435 — FL side ABG active circuit open

B1435 — FL side ABG active circuit open

Detailed page for trouble code B1435.

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Code

B1435

MITSUBISHI B — Body

FL side ABG active circuit open

Brand: MITSUBISHI
Type: B — Body
AI status
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Page language: EN

Causes

  • Open or broken wiring in front-left airbag/pretensioner circuit
  • Poor or corroded connector at the front-left airbag/pretensioner or SRS ECU
  • Disconnected connector after service or collision repair
  • Failed front-left airbag module or pretensioner (open squib)
  • Faulty SRS control unit or internal driver failure
  • Harness damage where it flexes (door hinge, seat, B-pillar)

Symptoms

  • SRS / airbag warning lamp illuminated
  • One or more SRS/airbag-related faults stored in memory
  • Front-left airbag or pretensioner may be disabled (no deployment on that side if crash occurs)
  • Possible intermittent warning if wiring is damaged and movement-dependent

What to check

  • Read SRS codes and freeze-frame data with a compatible scan tool
  • Visually inspect front-left airbag/pretensioner connector(s), harness routing, and SRS ECU connector for damage, corrosion, or disconnection
  • Inspect areas of flex (door hinge, seat belt anchor, B-pillar) for chafed wiring
  • Check for signs of prior repairs or splice wiring in SRS harness
  • Follow manufacturer safety procedure: disconnect battery and wait the specified time before touching SRS components

Signal parameters

  • Typical squib (airbag/pretensioner) circuit shows low resistance when intact (consult the specific service manual for exact ohm values)
  • Open-circuit will read as infinite resistance (OL) between squib pins and SRS ECU
  • SRS ECU supplies short diagnostic and firing pulses only; do not apply external power to squib circuits
  • Exact voltage/pulse parameters and resistance limits vary by model — use manufacturer data

Diagnostic algorithm

  1. Safety first: disable SRS system per service manual (disconnect battery and wait specified time) before inspecting or disconnecting connectors
  2. Use a compatible scan tool to read and record stored SRS codes and freeze-frame data. Note any additional SRS codes.
  3. Visually inspect the front-left airbag/pretensioner connector, the mating connector at the module, and wiring along its routing (especially door hinge, B-pillar, seat anchor). Look for corrosion, bent pins, damage, or disconnected connectors.
  4. With battery disconnected, check continuity/resistance of the front-left squib circuit between the SRS ECU connector and the airbag/pretensioner connector. Compare to published service limits. Do not attempt live measurements that could deploy the device.
  5. If open/infinite resistance is found, isolate the open section of harness and repair/replace wiring or connectors as required. If resistance is within spec but code remains, inspect for intermittent opens by moving harness while monitoring continuity or use a scan tool live-data/function test.
  6. If harness and connector are good but circuit still reports open, swap or test the front-left airbag/pretensioner module per service manual procedures (bench resistance checks per manufacturer guidance) and consider SRS ECU testing/replace if outputs are faulty.
  7. After repairs, reconnect battery per safety procedure, clear SRS codes with a scan tool, and verify SRS warning lamp goes out and no related codes return.
  8. Note: Always follow the manufacturer’s specific diagnostic and safety procedures when working on SRS circuits to avoid accidental deployment and injury.

Likely causes

  • Damaged or pinched harness at door hinge or B-pillar causing an open circuit
  • Loose/corroded connector at the front-left airbag or pretensioner
  • Open squib inside the front-left airbag/pretensioner module
  • Connector not fully seated after previous service or collision repair

Fault status

⚠️ Status
Front-left ABG active circuit open — SRS control unit detects an open/interrupt in the front-left airbag/pretensioner circuit. SRS lamp on; front-left deployment may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1430 B1431 B1436 B1420 B1400 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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