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Home / DTC / B1B0A — PS.ABG squib(1) open

B1B0A — PS.ABG squib(1) open

Detailed page for trouble code B1B0A.

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Code

B1B0A

MITSUBISHI B — Body

PS.ABG squib(1) open

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

Causes

  • Broken or damaged wiring in the passenger airbag squib circuit
  • Corroded, loose or disconnected connector at the passenger airbag module or harness
  • Faulty passenger airbag inflator / squib (open internal coil)
  • Poor ground or open return path in the SRS harness
  • Faulty SRS control module or connector (less common)
  • Previous improper repairs or connector pin damage

Symptoms

  • SRS / airbag warning lamp illuminated on instrument cluster
  • Passenger airbag may be disabled (occupant protection reduced)
  • Related occupant detection or airbag system messages in scan tool
  • Possible stored additional SRS codes

What to check

  • Read SRS codes and freeze frame data with an appropriate scan tool
  • Visual inspection of passenger airbag connector and wiring for damage, corrosion or pin push-out
  • Check connector mating and retention (no bent/missing pins)
  • Measure continuity/resistance of the squib circuit with ignition off and battery disconnected
  • Inspect for aftermarket accessories or previous repairs that may have disturbed the harness

Signal parameters

  • Open-circuit reading (OL / infinite) between squib connector pins indicates the open
  • Typical undeployed squib resistance: approximately 2–5 ohms (varies by vehicle/inflator); a very high or infinite reading indicates open
  • SRS warning lamp active when SRS ECU detects open circuit
  • No deploy voltage present at squib until commanded by SRS ECU (do not apply external voltage)

Diagnostic algorithm

  1. Safety first: Disable SRS power by disconnecting the negative battery terminal and wait the manufacturer-specified time (commonly ~90 seconds) before working on SRS components.
  2. Use a compatible scan tool to confirm B1B0A and note any additional SRS codes and freeze frame data; clear codes and see if B1B0A returns.
  3. Perform a visual inspection of the passenger airbag module area, connector, and harness routing for damage, water intrusion, or corrosion.
  4. With battery still disconnected, disconnect the passenger airbag connector from the module and inspect pins for corrosion, damage or loose terminals.
  5. Measure resistance across the airbag squib pins at the module connector. An open (OL/infinite) indicates an open squib or connector issue. Compare reading to manufacturer spec if available.
  6. If connector at module shows correct resistance but open is present at ECU side, trace harness and measure continuity between module connector and SRS ECU connector to find break point.
  7. Repair any damaged wiring or replace corroded connectors. If wiring and connectors are intact but squib resistance is open, replace the passenger airbag module (squib).
  8. If repairs require SRS ECU replacement or reconnection, follow manufacturer procedures for coding/initialization.
  9. Reconnect everything, reconnect battery, use scan tool to clear codes and perform built-in SRS system checks or readiness test. Verify SRS lamp extinguishes and code does not return.
  10. If code persists after wiring and airbag replacement, consider SRS ECU or hidden connector faults and consult factory repair information.

Likely causes

  • Open or disconnected connector at the passenger airbag module
  • Broken wire in the harness between passenger airbag and SRS ECU
  • Failed passenger airbag squib (internal open circuit)

Fault status

⚠️ Status
Passenger airbag squib (1) open circuit detected. SRS control unit indicates loss of continuity to the passenger airbag igniter; SRS warning lamp illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

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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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