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Home / DTC / B1BB4 — PS.ABG cut off SW circuit high

B1BB4 — PS.ABG cut off SW circuit high

Detailed page for trouble code B1BB4.

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Code

B1BB4

MITSUBISHI B — Body

PS.ABG cut off SW circuit high

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

Causes

  • Open circuit in passenger cutoff switch wiring
  • Short to battery voltage (power) on the cutoff switch circuit
  • Corroded or loose connector at the passenger cutoff switch or SRS ECU
  • Faulty passenger airbag cutoff (on/off) switch
  • Faulty SRS/airbag control module input circuit
  • Blown or incorrect fuse, or recent aftermarket electrical work interfering with wiring

Symptoms

  • SRS/Airbag warning lamp illuminated on dash
  • Passenger airbag disabled indicator may be on or incorrect
  • Stored DTC B1BB4 (PS.ABG cut off SW circuit high) in SRS module
  • Possible inability to enable/disable passenger airbag until fault is cleared

What to check

  • Read and record all SRS codes with an OEM-capable scan tool; note freeze-frame data and related codes
  • Visually inspect wiring and connectors for the passenger cutoff switch (glovebox/console area) and SRS ECU for damage, corrosion, or loose pins
  • Check relevant fuses and grounding points for the SRS system
  • With ignition ON and safety precautions (see diagnostic steps), measure voltage at the cutoff switch connector in both switch positions
  • Perform continuity/resistance checks from the switch connector back to the SRS ECU pin to detect opens or shorts
  • Wiggle-test harness while monitoring the circuit for intermittent changes

Signal parameters

  • Expected behavior: distinct voltage/logic level change when passenger cutoff switch is toggled (design varies by model)
  • Typical signal levels (examples only — confirm with service manual): ~0 V (or low logic level) for one position and a higher voltage (several volts up to battery voltage) for the other position; some systems provide a switched ground or low-voltage signal to the ECU
  • Resistance of a functioning mechanical switch should change between near 0 ohms (closed) and open/infinite (open) — confirm exact values with manufacturer specs

Diagnostic algorithm

  1. Safety first: follow SRS service procedures. Disable battery negative terminal and wait the manufacturer-specified time (commonly 5–15 minutes) before touching SRS components.
  2. Connect OEM scan tool. Read and record all SRS-related codes and freeze frame. Note any additional SRS codes.
  3. Visually inspect the passenger cutoff switch, its connector, and harness routing for damage, corrosion, or aftermarket modifications.
  4. With battery reconnected and ignition ON (follow safety precautions), backprobe the cutoff switch connector. Operate the switch and observe voltage/signal at the connector. Compare behavior to the service manual specification.
  5. If voltage is high/constant, disconnect the switch and measure voltage at the wiring harness from the vehicle/ECU side to determine if the fault is in the switch or wiring. Check for short to power.
  6. Perform continuity/resistance check between switch connector and SRS ECU input pin with harness disconnected to find opens. Repair any broken wires, poor crimps, or corroded connectors.
  7. If wiring and switch test good, consider SRS ECU input fault — consult manufacturer procedures for ECU testing or replacement.
  8. After repairs, clear codes with scan tool, perform SRS system self-test, and verify the fault does not return. Recheck related SRS indicators and system status.
  9. Note: Always follow the vehicle manufacturer’s SRS handling and repair precautions. If unsure, refer to a qualified SRS technician.

Likely causes

  • Damaged or pinched harness near the glovebox/center console where the switch is located
  • Connector corrosion or bent pins at the switch or SRS ECU
  • Faulty cutoff switch (mechanical/electrical failure)
  • Short to battery voltage from nearby wiring or accessory installation

Fault status

⚠️ Status
Passenger airbag cutoff switch circuit reading high/open — control module detects voltage above expected range. Passenger airbag enable/disable state may be incorrect.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1BB5 B1780 B1600 B0100 B1800
406

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