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Home / DTC / B1B19 — Left curtain ABG squib high

B1B19 — Left curtain ABG squib high

Detailed page for trouble code B1B19.

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Code

B1B19

MITSUBISHI B — Body

Left curtain ABG squib high

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

Causes

  • Open circuit in left curtain squib wiring
  • High resistance due to poor/corroded connector or pin
  • Disconnected or damaged airbag connector at the curtain module
  • Failed curtain airbag module (igniter/squib) with increased resistance
  • Faulty airbag ECU (SRS/ABG control unit) or internal driver fault
  • After deployment — circuit not properly repaired/replaced

Symptoms

  • SRS/Airbag warning lamp illuminated
  • Possible loss of left curtain airbag deployment capability
  • Stored fault code(s) in airbag ECU
  • No other drivability symptoms (electrical only)

What to check

  • Read and record stored SRS codes with a compatible scan tool
  • Check vehicle history for prior airbag deployment or repairs
  • Visual inspection of left curtain airbag connector, wiring, and roof/A‑pillar routing
  • Check for corrosion, bent pins, damaged insulation, or disconnected plugs
  • Measure continuity and resistance of the squib circuit with connectors disconnected (follow safety steps below)
  • Inspect airbag ECU connectors and grounds for damage or contamination

Signal parameters

  • Expected squib resistance (typical): approx. 2–5 ohms for intact squib (manufacturer spec may vary)
  • Open/high resistance: OL, >100 ohms or infinite (indicates open circuit)
  • Short to ground: near 0 ohms (indicates short; different code often logged)
  • No deployment voltage present during normal key‑on; never energize squib during tests — do not attempt to fire the squib

Diagnostic algorithm

  1. Safety first: Disable battery negative terminal and wait at least the manufacturer specified time (commonly 90 seconds or more) to allow SRS capacitors to discharge before touching SRS connectors.
  2. Use an OEM‑compatible scan tool to clear codes, then perform an ignition cycle and see if B1B19 returns to confirm persistence.
  3. Visually inspect left curtain airbag harness, connectors, and clips along the headliner/A‑pillar for damage, pin corrosion, or disconnection.
  4. With battery still disconnected, unplug the curtain airbag connector and measure resistance across the squib terminals with a digital multimeter. Compare to manufacturer spec (typical ~2–5 ohms). A very high or infinite reading indicates an open/high resistance.
  5. Backprobe the airbag ECU harness connector while respecting safety and manufacturer procedures. Check continuity from ECU pin to airbag connector pin and to good chassis ground where appropriate.
  6. If resistance is high in-circuit, isolate sections by disconnecting intermediate connectors and retesting to locate the open/high resistance section.
  7. If wiring and connectors check OK and squib resistance remains out of spec, replace the left curtain airbag module with a new/original part and retest.
  8. If new module still shows high resistance or tests fail at ECU pins, suspect faulty airbag ECU — verify all wiring and grounds, then consider ECU replacement following manufacturer procedures.
  9. After repair, reconnect battery, clear codes with scan tool, and confirm that SRS lamp goes out and B1B19 does not return.

Likely causes

  • Loose/corroded connector at left curtain airbag
  • Broken/abraded wire in harness near A‑pillar or roof area
  • Left curtain airbag module damaged or previously deployed
  • Poor crimp or terminal at ECU connector
  • Intermittent connection due to connector contamination or pin damage

Fault status

⚠️ Status
Left curtain ABG squib circuit — high resistance/open detected. Airbag circuit may not function correctly; SRS fault stored in airbag control unit.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B18 B1B1A B1B10 B1B15 B1803
406

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