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Home / DTC / B1452 — FL curtain ABG squib grounding

B1452 — FL curtain ABG squib grounding

Detailed page for trouble code B1452.

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Code

B1452

MITSUBISHI B — Body

FL curtain ABG squib grounding

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

Causes

  • Damaged/chafed wiring in roof/headliner or A-pillar harness
  • Corroded or poorly connected squib connector at the curtain airbag
  • Short to chassis ground on the squib wire
  • Open circuit or broken wire in squib circuit
  • Faulty curtain airbag (squib) assembly
  • Faulty airbag control module or internal driver fault

Symptoms

  • SRS/Airbag warning lamp illuminated on dash
  • Curtain airbag disabled (SRS system will inhibit deployment)
  • Related airbag DTCs stored (other squib circuits or module faults)
  • Possible diagnostic trouble with communication to SRS module

What to check

  • Read and record all SRS/airbag DTCs and freeze frame with a Mitsubishi-compatible scan tool
  • Visually inspect headliner, A-pillar trim and wiring routing for damage, pinched wiring, or water ingress
  • Inspect curtain airbag connector and wiring harness for corrosion, bent pins, loose or pushed-out pins
  • Confirm battery disconnect procedure and safety wait time before touching airbag connectors (follow manufacturer service manual)
  • Measure squib circuit resistance and continuity only after isolating circuit per service manual

Signal parameters

  • Typical curtain squib resistance (nominal): approximately 1–5 ohms (varies by model)
  • Open circuit / OL indicates broken wiring or disconnected squib
  • Very low resistance near 0 Ω may indicate short to ground or internal shorted squib
  • No communication or persistent fault after repairs indicates possible airbag control module fault

Diagnostic algorithm

  1. Retrieve all SRS-related codes with a diagnostic scanner and note freeze-frame data. Verify B1452 repeats after a clear test. 2) Visually inspect the front-left curtain airbag area: headliner, A-pillar trim, wiring harness routing, clips, and connectors for obvious damage, pinching or corrosion. 3) Follow the vehicle manufacturer’s SRS safety procedure: disconnect battery negative and wait the specified time before working on airbag circuits. 4) With the squib connector disconnected and circuit isolated, measure resistance across the curtain squib terminals and compare to specification. 5) Measure resistance from each squib wire to chassis ground to check for a short to ground. 6) If resistance is out of spec or a short is present, trace wiring along the headliner/A-pillar to find chafed or damaged sections; repair wiring or replace connector as required. 7) If wiring and connectors are good but resistance is abnormal, replace the curtain airbag assembly. 8) If wiring and airbag assembly test good, suspect airbag control module or internal driver; diagnose module communication and outputs with professional scan tool and replace module if required. 9) After repairs, reconnect battery, clear codes, and perform SRS system self-test to confirm fault cleared and lamp extinguishes. Note: always follow Mitsubishi service manual for safety, connector handling, and deployment procedures.

Likely causes

  • Harness chafing where wiring passes through A-pillar or roof rail
  • Poor pin contact or push-out at squib connector behind the headliner
  • Connector corrosion from moisture (sunroof/drains leakage)
  • Low-resistance short due to pin contact with body ground or metal clip
  • Defective squib element showing shorted low resistance
  • Previous crash repair with improperly routed wires

Fault status

⚠️ Status
Front-left curtain airbag (squib) circuit grounding detected — possible short to ground, low resistance, or connector/wiring fault. SRS curtain airbag circuit disabled until corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1451 B1453 B1420 B1491 B1800
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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