AutoCodes – Generic – B1B50

B1B50 Code - 1st Row Driver Seat Belt Sensor Circuit Low

Quick Answer

When powered, the Occupant Restraint Controller (ORC) sends a test current across the Driver Seat Belt 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: B1B50 indicates 1st Row Driver Seat Belt Sensor Circuit Low.
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 2,688

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 B1B50 Description

When powered, the Occupant Restraint Controller (ORC) sends a test current across the Driver Seat Belt Switch circuits every 100ms to verify the integrity of the switch and wiring. The DTC will set if the circuits are shorted together or to ground for 2.5 seconds and the code will transition from active to stored when the current returns to a normal range for five seconds. 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. While the ignition on and the Occupant Restraint Controller (ORC) is configured for a Driver Seat Belt Switch, the ORC checks the switch input current ranges. The ORC monitors the switch input current ranges at power up and continuously every 100ms.

OBDII Code B1B50 - 1st Row Driver Seat Belt Sensor Circuit Low - AutoCodes.com — B1B50 Code - 1st Row Driver Seat Belt Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC B1B50?

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 B1B50?

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 B1B50 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 B1B50 code?

Need more information on how to fix the B1B50 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1B50 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1B50 Chrysler — 1st Row Driver Seat Belt Sensor Circuit Low
B1B50 Dodge — 1st Row Driver Seat Belt Sensor Circuit Low
B1B50 Fiat — 1st Row Driver Seat Belt Sensor Circuit Low
B1B50 Ford — Left Rear Inner Parking Aid Sensor
B1B50 Jeep — 1st Row Driver Seat Belt Sensor Circuit Low
B1B50 Land Rover — Left Rear Inner Parking Aid Sensor
B1B50 Lincoln — Left Rear Inner Parking Aid Sensor
B1B50 Mercury — Left Rear Inner Parking Aid Sensor
B1B50 Mitsubishi — 1st Row Driver Seat Belt Sensor Circuit Low
B1B50 RAM — 1st Row Driver Seat Belt Sensor Circuit Low

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 B1B50 Code

1. What are common symptoms associated with OBDII code B1B50?

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

2. What could cause the 1st Row Driver Seat Belt Sensor Circuit Low code B1B50?

Possible causes could include a faulty seat belt sensor, damaged wiring in the seat belt system, or a malfunction in the airbag control module.

3. How can I diagnose the 1st Row Driver Seat Belt Sensor Circuit Low code B1B50?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the seat belt sensor and its wiring for damage, and testing the electrical connections in the circuit.

4. Can I continue to drive my vehicle with the B1B50 code present?

It is not recommended to continue driving with this code present, as it indicates a potential issue with the driver seat belt sensor that could affect the proper functioning of the airbag system in case of an accident.

5. What are the repair options for OBDII code B1B50?

Repair options may include replacing the faulty seat belt sensor, repairing damaged wiring, or resetting the airbag control module after fixing the underlying issue.

6. Is it safe to reset the OBDII code B1B50 without addressing the underlying problem?

Resetting the code without addressing the underlying issue may temporarily turn off the warning light, but it will not resolve the underlying problem with the seat belt sensor circuit.

7. How much does it typically cost to repair OBDII code B1B50?

The cost of repair can vary depending on the specific cause of the issue, but it may involve parts and labor costs for sensor replacement or wiring repairs.

8. Can a DIY enthusiast fix the B1B50 code issue at home?

While some basic troubleshooting steps can be performed at home, diagnosing and repairing the seat belt sensor circuit issue may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

9. Are there any safety implications of ignoring the B1B50 code?

Ignoring the B1B50 code may compromise the functionality of the airbag system, potentially increasing the risk of injury in the event of a collision, so it is important to address the issue promptly.

10. How can I prevent the recurrence of OBDII code B1B50 in the future?

Regular maintenance of the seat belt system, avoiding rough handling of the seat belt, and promptly addressing any warning lights related to the airbag system can help prevent the recurrence of this code in the future.