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Home / DTC / B1454 — FL curtain ABG active circuit SH

B1454 — FL curtain ABG active circuit SH

Detailed page for trouble code B1454.

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Code

B1454

MITSUBISHI B — Body

FL curtain ABG active circuit SH

Brand: MITSUBISHI
Type: B — Body
Views: UK: 19 EN: 23 RU: 21
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Page language: EN

Causes

  • Damaged or chafed wiring in the front-left curtain airbag harness causing short to ground or battery
  • Corroded, loose, or contaminated connector at the front-left curtain airbag or airbag control module
  • Shorted airbag squib (internal short in the curtain airbag inflator/squib)
  • Incorrect repairs or aftermarket component damage (e.g., windshield replacement, roof trim removal)
  • Faulty airbag control unit (rare)

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument cluster
  • Possible disabled front-left curtain airbag (system may inhibit deployment)
  • Other SRS-related warning messages or multiple SRS DTCs present
  • No obvious drivability symptoms (vehicle will run normally)

What to check

  • Read and record all SRS codes with a diagnostic scan tool. Note freeze-frame data if available.
  • Perform visual inspection of the front-left roof/headliner, A-pillar, and connector locations for damage or loose connectors.
  • Disconnect battery negative terminal and wait manufacturer-specified time before touching SRS components.
  • Inspect the curtain airbag connector for corrosion, bent pins, or foreign material. Re-seat and secure connector.
  • Measure continuity and resistance of the FL curtain squib circuit per service manual procedures.
  • Check for shorts to battery and ground at the harness using an ohmmeter/isolation tester.

Signal parameters

  • Squib circuit resistance (intact squib): typically a low but non-zero value (commonly ~2–6 ohms for many squibs) — consult factory spec
  • Open-circuit: infinite resistance (open wiring or disconnected squib)
  • Short to ground: near 0 ohms between squib circuit and chassis ground
  • Short to battery: continuity to battery +12V when key OFF (indicates short to power)
  • Voltage at airbag connector with ignition ON (do not apply power to squib): diagnostic reference values per service manual

Diagnostic algorithm

  1. Safety first: Disable SRS power by disconnecting negative battery cable and wait the recommended time in the service manual before working on SRS circuits.
  2. Use a scan tool to confirm B1454 is present and note any additional SRS codes. Attempt to clear codes and see if B1454 returns.
  3. Perform a careful visual inspection of the FL curtain airbag harness from the airbag module to the curtain inflator: look for chafing, pinched wiring, or repair splice points.
  4. Inspect and unplug the FL curtain airbag connector. Check pins for corrosion, deformation, or pushed-out terminals. Clean or repair connector as required.
  5. With battery disconnected and service procedures followed, measure squib resistance at the airbag connector and at the airbag control unit end. Compare to factory specification. A very low (near zero) reading indicates a short; infinite indicates open.
  6. If resistance is abnormally low, isolate sections of the harness to locate short-to-ground or short-to-power using continuity checks between circuit and chassis ground or battery +, respectively.
  7. Wiggle test the harness while monitoring resistance or live diagnostic data (if allowed by procedure) to reproduce intermittent faults.
  8. If wiring and connectors are good, suspect a failed curtain airbag squib. Do NOT apply power to deploy; replace the inflator/squib assembly per manufacturer procedure.
  9. If a short in harness or connector is found, repair or replace damaged wiring/connector using correct gauge wire and insulated terminals; ensure proper routing and securement to prevent reoccurrence.
  10. After repairs, reconnect battery, use scan tool to clear codes, and perform self-tests to verify B1454 does not return. Confirm SRS lamp extinguishes and system passes diagnostics.

Likely causes

  • Wiring harness abrasion where it passes through roof/headliner or A-pillar
  • Connector pin corrosion or bent terminal at the curtain airbag connector
  • Failed curtain airbag squib with internal short
  • Short to battery +12V due to pin contact or connector damage

Fault status

⚠️ Status
Front Left (FL) curtain airbag activation circuit - short circuit detected. SRS/Airbag warning lamp illuminated; curtain airbag may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1450 B1451 B1453 B1455 B1500
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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