Engine-Codes.com
Engine-Codes – Generic – B1903

B1903 Code - Short to Positive in Front Pretensioner Squib Right Circuit

Quick Answer

The B1903 diagnostic trouble code indicates a short to positive in the front pretensioner squib right circuit of the vehicle. Common causes include Damaged or frayed wiring in the front pretensioner squib right circuit, Faulty pretensioner squib, Malfunctioning airbag control module. 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
B1903 indicates Short to Positive in Front Pretensioner Squib Right Circuit.
Common causes
Common causes include Damaged or frayed wiring in the front pretensioner squib right circuit, Faulty pretensioner squib, Malfunctioning airbag control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B1903 Description

The B1903 diagnostic trouble code indicates a short to positive in the front pretensioner squib right circuit of the vehicle. In simpler terms, this means that there is an electrical issue in the circuit responsible for the right front seatbelt pretensioner. The pretensioner is a safety feature that tightens the seatbelt in the event of a collision, reducing the forward movement of the occupant and minimizing the risk of injury.

OBDII Code B1903 - Short to Positive in Front Pretensioner Squib Right Circuit
B1903 Code - Short to Positive in Front Pretensioner Squib Right Circuit

Common Causes of B1903

  1. Damaged or frayed wiring in the front pretensioner squib right circuit.
  2. Faulty pretensioner squib.
  3. Malfunctioning airbag control module.
  4. Electrical issues in the vehicle's wiring system.
  5. Physical damage to the seatbelt pretensioner components.

Symptoms of B1903

  1. Airbag warning light illuminated on the dashboard.
  2. Intermittent or complete failure of the seatbelt pretensioner system.
  3. Diagnostic trouble code B1903 stored in the vehicle's onboard computer.
  4. Issues with other safety systems, such as the airbags or seatbelt warning chime.

How to Fix B1903

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scan tool to retrieve the trouble codes and pinpoint the source of the problem.
  2. Inspect the wiring harness for any signs of damage, such as fraying or corrosion. Repair or replace any damaged wires as needed.
  3. Test the pretensioner squib and the airbag control module to determine if they are functioning correctly. Replace any faulty components.
  4. Clear the trouble codes from the vehicle's computer system and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the electrical system or other components.

Cost to Fix B1903

The cost of repairing a short to positive in the front pretensioner squib right circuit can vary depending on the specific cause of the issue and the make and model of the vehicle. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue may fall in the range of $200 to $800. It is essential to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's specific requirements and local labor rates.

Need more information about the B1903 code?

Need more information on how to fix the B1903 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1903 code diagnosed by a professional: Find a repair shop in your area

Code B1903 Information for Specific Makes

  • B1903 Lexus — Short to Positive in Front Pretensioner Squib Right Circuit
  • B1903 Scion — Short to Positive in Front Pretensioner Squib Right Circuit
  • B1903 Toyota — Short to Positive in Front Pretensioner Squib Right Circuit

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 B1903 Code

1. What are the common symptoms of OBDII code B1903 "Short to Positive in Front Pretensioner Squib Right Circuit"?

- The common symptoms include the airbag warning light illuminating on the dashboard and potential non-deployment of the right front airbag in the event of a collision.

2. What can cause OBDII code B1903 to trigger?

- This code is typically triggered by a short circuit between the front pretensioner squib right circuit and a positive power source in the airbag system.

3. How serious is OBDII code B1903 "Short to Positive in Front Pretensioner Squib Right Circuit"?

- This code is considered serious as it indicates a fault in the right front airbag system, which may compromise occupant safety in the event of a collision.

4. Can I continue driving with OBDII code B1903 active?

- It is not recommended to drive with this code active, as it signifies a potential issue with the right front airbag system, which is a crucial safety feature.

5. How can I diagnose and repair OBDII code B1903?

- Diagnosis and repair of this code require specialized equipment and expertise. It is recommended to consult a qualified mechanic or dealership to properly diagnose and fix the issue.

6. Are there any DIY repair tips for OBDII code B1903?

- DIY repair of this code is not recommended due to the complexity and safety implications associated with airbag systems. It is best to seek professional assistance.

7. Will resetting the OBDII code B1903 resolve the issue?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the fault in the right front airbag system.

8. How much does it cost to repair OBDII code B1903?

- The cost of repairing this code can vary depending on the specific issue causing it. It is advisable to get a professional diagnosis to determine the exact repair cost.

9. Can a faulty seatbelt cause OBDII code B1903 to trigger?

- Yes, a faulty seatbelt or its pretensioner mechanism can sometimes cause OBDII code B1903 to trigger if it affects the right front airbag system.

10. Is it safe to attempt to fix OBDII code B1903 on my own?

- Due to the safety implications and complexity of airbag systems, it is not safe to attempt to fix OBDII code B1903 on your own. Always seek professional help for such issues.

Discuss the causes and fixes for B1903 OBDII Code

Submit a New Comment

Code B1903 comments

No comments found for this page.