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Home / DTC / B1404 — F ABG(1)DR.active circuit short

B1404 — F ABG(1)DR.active circuit short

Detailed page for trouble code B1404.

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Code

B1404

MITSUBISHI B — Body

F ABG(1)DR.active circuit short

Brand: MITSUBISHI
Type: B — Body
Views: UK: 17 EN: 28 RU: 27
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Page language: EN

Causes

  • Damaged or chafed wiring in driver airbag circuit
  • Short to ground or short to battery voltage in the driver squib wiring
  • Poor or corroded connector(s) at the driver airbag or SRS ECU
  • Faulty driver airbag module (squib) with internal short
  • Faulty SRS (airbag) control module or connector pins
  • Clock spring (spiral cable) damage or internal short

Symptoms

  • Airbag warning light illuminated on instrument cluster
  • Possible loss of driver airbag deployment readiness for that circuit
  • Other SRS faults or warnings present
  • Steering wheel controls or horn intermittent (if related to clock spring damage)

What to check

  • Confirm exact DTC and freeze-frame data with a capable scan tool
  • Check for additional SRS-related codes that could help isolate the circuit
  • Perform careful visual inspection of driver airbag connector and wiring (steering column, under-dash harness)
  • Inspect steering wheel clock spring / spiral cable for damage or wear
  • Inspect SRS ECU connector for bent/corroded pins

Signal parameters

  • Circuit voltage with key ON (expected: system voltage present/no short to ground)
  • Continuity and resistance of driver squib (typical squib resistance is low; consult factory spec)
  • Resistance between squib circuit and ground (should be open/high)
  • Resistance between squib circuit and battery positive (should be open/high)
  • Scan tool SRS module data (status bits, internal short detection flags)

Diagnostic algorithm

  1. SAFETY FIRST: Disable SRS power per factory procedure (disconnect battery negative and wait the manufacturer-specified time, commonly 5–15 minutes) before touching connectors or components.
  2. Retrieve and record all SRS codes and freeze-frame data with a proper scan tool. Note any related codes.
  3. Perform a careful visual inspection of driver airbag connector, wiring in steering column, under-dash harness and SRS ECU connector for damage, pin corrosion, loose terminals, or water ingress.
  4. With SRS power disabled and following manufacturer safety steps, disconnect the driver airbag connector at the steering wheel and measure resistance across the squib terminals using a multimeter. Compare to factory spec (consult service manual).
  5. Check resistance from each squib terminal to chassis ground and to battery positive to detect shorts to ground or power. Values should be open/high; low values indicate short.
  6. If squib resistance is normal, inspect and measure continuity of wiring harness between airbag connector and SRS ECU. Wiggle steering wheel/column while monitoring for intermittent changes.
  7. If short/low resistance is present at the steering wheel connector, suspect clock spring or airbag module. If short is present only at ECU connector, suspect harness or SRS ECU fault.
  8. Repair or replace damaged wiring, connectors, clock spring, or airbag module per factory procedures. Replace SRS ECU only after verifying wiring and components are good.
  9. After repairs, reconnect and restore SRS power, clear codes with scan tool, then verify the SRS light goes out and no B1404 returns. Perform final system checks per service manual.
  10. If unsure or if repairs require airbag replacement or ECU replacement, follow manufacturer procedures or refer to qualified SRS technician.

Likely causes

  • Wiring chafed at steering column (clock spring area) due to steering movement
  • Connector pin pulled/corroded at driver airbag connector behind steering wheel
  • Clock spring worn or broken causing internal short to ground
  • Airbag squib internal failure (low resistance/short)

Fault status

⚠️ Status
SRS: Front driver airbag (F ABG(1)DR) active circuit short detected — circuit low resistance or short to power/ground.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1400 B1401 B1402 B1403 B1405 B1406
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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