AutoCodes – Generic – B1B51

B1B51 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 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 4,087

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

What does this mean?

What are the Possible Causes of the DTC B1B51?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

B1B51 Chrysler — 1st Row Driver Seat Belt Sensor Circuit High
B1B51 Dodge — 1st Row Driver Seat Belt Sensor Circuit High
B1B51 Fiat — 1st Row Driver Seat Belt Sensor Circuit High
B1B51 Jeep — 1st Row Driver Seat Belt Sensor Circuit High
B1B51 Mitsubishi — 1st Row Driver Seat Belt Sensor Circuit High
B1B51 RAM — 1st Row Driver Seat Belt Sensor Circuit High

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 Code

1. What are common symptoms of OBDII code B1B51 (1st Row Driver Seat Belt Sensor Circuit High)?

The common symptoms include the airbag warning light being illuminated on the dashboard and possible issues with the driver's seat belt sensor.

2. What can cause the OBDII code B1B51 to trigger?

The code B1B51 is triggered when the driver seat belt sensor circuit records a high voltage signal, indicating a potential fault in the sensor or its wiring.

3. How serious is the OBDII code B1B51 (1st Row Driver Seat Belt Sensor Circuit High)?

While the vehicle may still be operable, it is important to address this issue promptly as it can affect the proper functioning of the seat belt sensor and airbag system in the event of a collision.

4. Are there any safety concerns associated with the OBDII code B1B51?

Yes, there are safety concerns as the code indicates a potential problem with the driver's seat belt sensor, which is crucial for the proper deployment of the airbag in case of an accident.

5. What should I do if I encounter the OBDII code B1B51?

It is recommended to have the vehicle inspected by a qualified mechanic to diagnose the exact cause of the issue and perform any necessary repairs to ensure the safety of the airbag system.

6. Can I continue driving my vehicle with the OBDII code B1B51 present?

While the vehicle may still be functional, driving with the code present can pose a risk in the event of an accident due to potential issues with the driver's seat belt sensor.

7. How can the OBDII code B1B51 be repaired?

Repairing the B1B51 code typically involves diagnosing and fixing any faults in the driver seat belt sensor circuit, which may include replacing the sensor or repairing damaged wiring.

8. Is it possible to reset the OBDII code B1B51 without fixing the underlying issue?

Resetting the code without addressing the underlying problem will not resolve the issue and the code is likely to reappear until the root cause is fixed.

9. Can a DIY enthusiast fix the OBDII code B1B51 at home?

While some DIY enthusiasts may have the skills to diagnose and repair the issue, it is recommended to seek professional help to ensure the proper functioning of the seat belt sensor and airbag system.

10. How much does it typically cost to repair the OBDII code B1B51?

The cost of repairing the B1B51 code can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, and labor costs, which can range from moderate to expensive.