AutoCodes – RAM – B1C40 RAM

B1C40 RAM Code - 1st Driver Seat Belt Buckle Tensioner Circuit Shorted Together

Quick Answer

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. Common causes include Faulty 1st Driver Seat Belt Buckle Tensioner, 1st Driver Seat Belt Buckle Tensioner harness is open or shorted, 1st Driver Seat Belt Buckle Tensioner 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: B1C40 RAM indicates 1st Driver Seat Belt Buckle Tensioner Circuit Shorted Together.
Common causes: Common causes include Faulty 1st Driver Seat Belt Buckle Tensioner, 1st Driver Seat Belt Buckle Tensioner harness is open or shorted, 1st Driver Seat Belt Buckle Tensioner 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 938

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 26, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1C40 RAM Description

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. These circuits are maintained in a floating configuration at the module (connected to neither power nor ground) as protection against inadvertent deployment. The use of the Supplemental Restraints System (SRS) Load Tool Adapter provides a test point as well as a method for opening the shorting bar connections within the harness connector. The ORC sends out a 40 mA diagnostic current on each squib voltage supply circuit at power up and every 500 ms thereafter while the ignition is in on. The module then monitors the data return wire to determine the state of the circuit.

OBDII Code B1C40 RAM - 1st Driver Seat Belt Buckle Tensioner Circuit Shorted Together - AutoCodes.com — B1C40 RAM Code - 1st Driver Seat Belt Buckle Tensioner Circuit Shorted Together

What does this mean?

What are the Possible Causes of the DTC B1C40 RAM?

Faulty 1st Driver Seat Belt Buckle Tensioner
1st Driver Seat Belt Buckle Tensioner harness is open or shorted
1st Driver Seat Belt Buckle Tensioner circuit poor electrical connection
Faulty Occupant Restraint Controller (ORC)

How to Fix the DTC B1C40 RAM?

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 B1C40 RAM 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 B1C40 RAM code?

Need more information on how to fix the B1C40 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1C40 RAM 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 B1C40 RAM Code

1. What are common symptoms of OBDII code B1C40 related to the 1st driver seat belt buckle tensioner circuit being shorted together?

When this code is triggered, you may experience issues with the driver seat belt tensioner system, such as the seat belt not retracting properly or the airbag warning light illuminating on the dashboard.

2. What are possible causes of OBDII code B1C40 indicating a shorted 1st driver seat belt buckle tensioner circuit?

Common causes of this fault code include damaged wiring in the seat belt buckle tensioner circuit, a faulty seat belt buckle tensioner, or a problem with the airbag control module.

3. How can I diagnose OBDII code B1C40 related to the 1st driver seat belt buckle tensioner circuit being shorted together?

Diagnosing this code typically involves performing a thorough visual inspection of the seat belt buckle and tensioner wiring, checking for any visible damage or corrosion. Using a multimeter to test the continuity of the circuit is also recommended.

4. Can I continue driving my vehicle with OBDII code B1C40 indicating a shorted 1st driver seat belt buckle tensioner circuit?

It is not recommended to drive the vehicle with this fault code active, as it may affect the proper functioning of the seat belt tensioner system and compromise occupant safety in the event of a collision.

5. How can I repair OBDII code B1C40 related to the 1st driver seat belt buckle tensioner circuit shorted together?

Repairing this issue often involves repairing or replacing damaged wiring in the seat belt buckle tensioner circuit, replacing the faulty seat belt buckle tensioner, or addressing any issues with the airbag control module.

6. Are there any safety precautions I should take when working on the 1st driver seat belt buckle tensioner circuit to resolve OBDII code B1C40?

It is important to disconnect the vehicle's battery before working on any electrical components, including the seat belt buckle tensioner circuit, to prevent accidental deployment of the airbags.

7. Will resetting the OBDII code B1C40 clear the issue with the 1st driver seat belt buckle tensioner circuit?

Resetting the fault code may temporarily turn off the warning light, but it will not fix the underlying issue causing the shorted circuit. It is essential to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair OBDII code B1C40 related to the 1st driver seat belt buckle tensioner circuit shorted together?

The cost of repairing this fault code can vary depending on the extent of the damage and the parts that need replacement. It is recommended to consult with a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B1C40 indicating a shorted 1st driver seat belt buckle tensioner circuit?

While some DIY enthusiasts may be able to diagnose and repair simple wiring issues, dealing with safety-critical components like the seat belt tensioner circuit is best left to experienced professionals to ensure proper functionality and safety.

10. How can I prevent OBDII code B1C40 from occurring in the future with regards to the 1st driver seat belt buckle tensioner circuit?

Regularly inspecting the seat belt buckle and tensioner wiring for any signs of wear or damage, and addressing any issues promptly, can help prevent the occurrence of this fault code in the future.