Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1B2F — PS.belt pretensioner circuit SHT

B1B2F — PS.belt pretensioner circuit SHT

Detailed page for trouble code B1B2F.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1B2F

MITSUBISHI B — Body

PS.belt pretensioner circuit SHT

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

Causes

  • Short to battery or short to ground in the passenger pretensioner wiring
  • Damaged/chafed wiring harness under seat (pinched, corrosion, wear)
  • Corroded or contaminated connector terminals at pretensioner or SRS ECU
  • Failed pretensioner squib (internal short)
  • Faulty SRS control unit or damaged ECU connector

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Passenger seatbelt pretensioner may not deploy in a crash
  • Possible inability to clear SRS fault or repeated fault on code readout
  • Related occupant restraint systems disabled (SRS lamp stays on)
  • Diagnostic trouble codes present for pretensioner circuit

What to check

  • Read/record all SRS codes with a compatible scan tool; note freeze frame/live data
  • Visually inspect passenger seat wiring harness, connectors and routing for damage, pinch points and corrosion
  • Inspect pretensioner connector for corrosion, bent pins, moisture, or foreign material
  • Check SRS fuses and related connectors for continuity and correct seating
  • Measure resistance (ohms) of pretensioner squib at connector with manufacturer safety procedures followed
  • Back-probe SRS ECU pretensioner pin(s) to check voltage levels per service manual (only if safe and allowed)

Signal parameters

  • Normal pretensioner squib resistance: typically low resistance (commonly about 1–3 ohms); consult factory spec for exact value
  • Open-circuit indication: very high resistance or OL on ohmmeter
  • Short indication: near 0 ohms or significantly lower than specified squib resistance
  • Voltage checks: with ignition ON (SRS powered) ECU reference voltages may show ~battery voltage at a short-to-battery condition, ~0 V for short-to-ground; follow manufacturer probe points and safety steps
  • Use low-voltage ohmmeter and observe manufacturer cautions — do NOT use a powered injector or high-voltage test across the squib

Diagnostic algorithm

  1. Capture codes and freeze frame with a scan tool. Do not attempt live deployment tests.
  2. Follow safety procedure: disable SRS system before accessing connectors (disconnect battery negative, wait manufacturer-specified time for capacitors to discharge).
  3. Visually inspect passenger seat area: connectors at pretensioner, seat harness routing, seat frame grommets. Look for chafing, water, or damage.
  4. With SRS disabled and battery disconnected, measure continuity/resistance across the pretensioner squib at the connector. Compare to factory specification. Replace pretensioner if internal short is confirmed.
  5. Check for short to battery/ground: measure resistance between pretensioner lead and chassis ground, and between lead and battery positive. Low resistance to ground or battery indicates wiring short.
  6. Disconnect pretensioner connector and measure back at wiring harness to isolate between harness and pretensioner. Wiggle harness while monitoring for intermittent shorts.
  7. Inspect and repair/replace damaged wiring, connectors, pins, or seat harness sections. Apply dielectric grease to clean connectors after repair.
  8. Reconnect battery, clear codes with scan tool and perform SRS system normality check per service manual. Verify that the SRS lamp extinguishes and code does not return.
  9. If wiring and pretensioner check good but fault persists, test/replace SRS control unit or have ECU diagnosed by qualified SRS technician or dealer.

Likely causes

  • Wire insulation chafed where harness passes through seat or body, contacting vehicle chassis or power feed
  • Moisture ingress or corrosion at pretensioner connector causing low resistance path
  • Connector pins bent or pushed out causing intermittent short
  • Pretensioner assembly electrically failed (internal shorted squib)
  • Shorted wiring due to aftermarket accessory routing or seat removal damage

Fault status

⚠️ Status
Short circuit detected in passenger seat belt pretensioner circuit (B1B2F). SRS warning lamp active; pretensioner circuit requires inspection and repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1B2E B1B2A B1B20 B1B21 B1000
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .