AutoCodes – Mitsubishi – B1B51 Mitsubishi

B1B51 Mitsubishi Code - 1st Row Driver Seat Belt Sensor Circuit High

Quick Answer

When powered, the Occupant Restraint Controller (ORC) sends a test current across the Driver Seat Belt Buckle Switch circuits every 100ms to verify the integrity of the switch and wiring. Common causes include Faulty Driver Seat Belt Buckle Switch, Driver Seat Belt Buckle Switch harness is open or shorted, Driver Seat Belt Buckle Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1B51 Mitsubishi indicates 1st Row Driver Seat Belt Sensor Circuit High.
Common causes: Common causes include Faulty Driver Seat Belt Buckle Switch, Driver Seat Belt Buckle Switch harness is open or shorted, Driver Seat Belt Buckle Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 873

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1B51 Mitsubishi Description

When powered, the Occupant Restraint Controller (ORC) sends a test current across the Driver Seat Belt Buckle Switch circuits every 100ms to verify the integrity of the switch and wiring. The front seat belt switches cannot be adjusted or repaired and, if ineffective or damaged, the entire front seat belt buckle-half unit must be replaced. The airbag warning lamp will display in the instrument cluster for this fault. With the ignition on and the Occupant Restraint Controller (ORC) configured for a Driver Seat Belt Buckle Switch. The ORC monitors the switch input current ranges at power up and continuously every 100ms.

OBDII Code B1B51 Mitsubishi - 1st Row Driver Seat Belt Sensor Circuit High - AutoCodes.com — B1B51 Mitsubishi Code - 1st Row Driver Seat Belt Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC B1B51 Mitsubishi?

Faulty Driver Seat Belt Buckle Switch
Driver Seat Belt Buckle Switch harness is open or shorted
Driver Seat Belt Buckle Switch circuit poor electrical connection
Faulty Occupant Restraint Controller (ORC)

How to Fix the DTC B1B51 Mitsubishi?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1B51 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1B51 Mitsubishi code?

Need more information on how to fix the B1B51 Mitsubishi code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1B51 Mitsubishi code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1B51 Mitsubishi Code

1. What are the common symptoms of OBDII code B1B51 in a Mitsubishi related to the 1st Row Driver Seat Belt Sensor Circuit High?

- The common symptoms include the airbag warning light illuminating on the dashboard and a possible failure of the seat belt sensor system.

2. What are the possible causes of OBDII code B1B51 indicating a 1st Row Driver Seat Belt Sensor Circuit High in a Mitsubishi?

- The code may be triggered by a faulty seat belt sensor, damaged wiring in the circuit, or a poor connection in the seat belt sensor system.

3. How can I diagnose the 1st Row Driver Seat Belt Sensor Circuit High issue in my Mitsubishi when OBDII code B1B51 is present?

- A thorough inspection of the seat belt sensor, checking the wiring for any damage, and testing the connections for continuity can help diagnose the problem.

4. Is it safe to drive my Mitsubishi with OBDII code B1B51 showing a 1st Row Driver Seat Belt Sensor Circuit High?

- It is not recommended to drive the vehicle with this issue as it may affect the functionality of the seat belt sensor system and compromise safety in the event of a collision.

5. Can I reset the OBDII code B1B51 related to the 1st Row Driver Seat Belt Sensor Circuit High in my Mitsubishi?

- Resetting the code may temporarily turn off the warning light, but it is essential to diagnose and repair the underlying issue causing the fault code to prevent it from reoccurring.

6. What are some repair tips for fixing OBDII code B1B51 in a Mitsubishi due to the 1st Row Driver Seat Belt Sensor Circuit High?

- Repair tips include checking and cleaning the seat belt sensor connections, replacing a faulty sensor if necessary, and repairing any damaged wiring in the circuit.

7. Can a DIY enthusiast fix the 1st Row Driver Seat Belt Sensor Circuit High problem causing OBDII code B1B51 in a Mitsubishi?

- While some simple tasks like checking connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to the seat belt sensor system may require professional assistance.

8. How much does it cost to repair OBDII code B1B51 linked to a 1st Row Driver Seat Belt Sensor Circuit High in a Mitsubishi?

- The repair cost can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is advisable to consult a mechanic for an accurate estimate.

9. Will fixing OBDII code B1B51 related to the 1st Row Driver Seat Belt Sensor Circuit High affect my Mitsubishi's airbag system?

- Resolving the seat belt sensor circuit high issue should restore the proper functioning of the airbag system in the vehicle and ensure its safety features operate correctly.

10. How often does the 1st Row Driver Seat Belt Sensor Circuit High problem causing OBDII code B1B51 occur in Mitsubishi vehicles?

- While not extremely common, issues with the seat belt sensor circuit leading to this specific fault code can occur due to sensor malfunctions or wiring issues in Mitsubishi models.