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Home / DTC / B1BC6 — Passenger ABG cut off SW

B1BC6 — Passenger ABG cut off SW

Detailed page for trouble code B1BC6.

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Code

B1BC6

MITSUBISHI B — Body

Passenger ABG cut off SW

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

Causes

  • Faulty passenger airbag cutoff switch (mechanical or electrical failure)
  • Damaged or corroded connector at the cutoff switch
  • Open, shorted, or damaged wiring between the switch and the airbag control unit
  • Poor ground or intermittent power to the switch circuit
  • Faulty Occupant Classification System (seat sensor) or related harness interfering with the circuit
  • Faulty airbag control module (rare)

Symptoms

  • SRS warning light illuminated on instrument cluster
  • Passenger airbag OFF indicator illuminated or incorrect status shown
  • Passenger airbag may be disabled when occupied, or status may change intermittently
  • Possible stored codes related to passenger airbag/occupant classification system

What to check

  • Read SRS module with a qualified scan tool; record freeze-frame and related DTCs
  • Visually inspect passenger cutoff switch, connector, and wiring under passenger seat for damage, corrosion, or loose pins
  • Check for aftermarket seat covers or seat repairs that may affect sensors or switch operation
  • With ignition ON (and battery safety procedures observed), monitor live data for passenger cutoff switch state and occupant classification status
  • Check for related DTCs in SRS/occupant classification modules

Signal parameters

  • Switch output state: typically a defined logic level reported to SRS (e.g., open/closed or 0 V / reference voltage); many systems use low (0V) = OFF, high (reference 5V) = ON — consult model-specific manual
  • Connector pin voltages with ignition ON: reference supply (typically 5V or key-switched 12V) and ground presence
  • Continuity/resistance across the switch: closed switch = low ohms, open = OL/high; expect near 0 Ω when closed (model-dependent)
  • Live-data status flag: occupant detected / cutoff switch state as reported by SRS

Diagnostic algorithm

  1. Safety first: disable battery negative terminal and wait the manufacturer-specified time before working on airbag components. Follow all SRS safety procedures.
  2. Read and log all SRS/airbag codes with a capable scan tool. Clear codes and see if B1BC6 returns. Note freeze frame and related codes.
  3. Visually inspect the passenger cutoff switch and connector for damage, loose pins, corrosion, or water ingress. Inspect harness under passenger seat and seat belt buckle wiring for chafing or pinching.
  4. Reconnect battery per safety procedure. With a diagnostic scan tool and ignition ON, monitor the passenger cutoff switch signal or status while operating the physical switch (if accessible) and while moving the seat. Observe for intermittent changes or faults.
  5. Measure supply and ground at the switch connector: verify reference voltage present and good ground. Measure switch output to the SRS module. Compare to expected logic levels (consult service data).
  6. With ignition OFF and battery disconnected, check continuity across switch terminals (and across repaired harness sections) and check for short to ground or power on the circuit to the SRS module.
  7. If wiring and switch test OK, inspect occupant classification/seat sensor wiring and connectors; some systems use combined logic and a fault there can set the code.
  8. If tests indicate a faulty switch, replace the passenger cutoff switch and retest. If wiring fault is found, repair with correct-sized automotive wiring and connectors, then protect harness routing.
  9. After repair, clear codes and run the SRS self-test and verify no related codes reappear. Confirm passenger airbag status and instrument cluster indicators behave correctly.
  10. Note: If replacement of airbag system components is required, follow manufacturer procedures and use OEM parts. If unsure, refer to factory service manual or a qualified SRS technician.

Likely causes

  • Loose or corroded connector at the passenger cutoff switch
  • Broken/shorted wire in the harness under the passenger seat (pinch points)
  • Switch contacts worn or stuck from age/contamination
  • Intermittent connection caused by seat position or movement

Fault status

⚠️ Status
Passenger airbag cutoff switch circuit fault — SRS reports abnormal or missing signal from passenger airbag disable/cutoff switch. Passenger airbag may be reported as disabled or system unavailable.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

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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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