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Engine-Codes – Generic – B1902

B1902 Code - Short to Ground in Front Pretensioner Squib Right Circuit

Quick Answer

The diagnostic code B1902 indicates a short to ground in the Front Pretensioner Squib Right Circuit. Common causes include Damaged wiring in the pretensioner circuit, Faulty pretensioner squib on the right side, Issues with the 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
B1902 indicates Short to Ground in Front Pretensioner Squib Right Circuit.
Common causes
Common causes include Damaged wiring in the pretensioner circuit, Faulty pretensioner squib on the right side, Issues with the 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 06, 2024
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Code B1902 Description

The diagnostic code B1902 indicates a short to ground in the Front Pretensioner Squib Right Circuit. In simpler terms, this means that there is an issue with the right side pretensioner in the vehicle's seatbelt system. The pretensioner is a safety feature that tightens the seatbelt in the event of a collision, helping to secure the occupant in place and reduce the risk of injury. A short to ground in this circuit can prevent the pretensioner from functioning properly, potentially compromising the vehicle's safety in the event of an accident.

OBDII Code B1902 - Short to Ground in Front Pretensioner Squib Right Circuit
B1902 Code - Short to Ground in Front Pretensioner Squib Right Circuit

Common Causes of B1902

  1. Damaged wiring in the pretensioner circuit
  2. Faulty pretensioner squib on the right side
  3. Issues with the airbag control module
  4. Corrosion or poor connections in the wiring harness
  5. Impact or collision that damaged the pretensioner system

Symptoms of B1902

  1. Airbag warning light illuminated on the dashboard
  2. Seatbelt not tightening properly in the event of sudden braking or a collision
  3. Audible warning chime related to the airbag system
  4. Diagnostic trouble codes related to the airbag system stored in the vehicle's computer

How to Fix B1902

  1. Diagnose the specific cause of the short to ground in the Front Pretensioner Squib Right Circuit using a diagnostic scanner and multimeter.
  2. Inspect the wiring harness for damage, corrosion, or poor connections, and repair or replace as necessary.
  3. Test the pretensioner squib on the right side to determine if it is faulty and replace if needed.
  4. Check the airbag control module for any issues and replace if necessary.
  5. Clear the diagnostic trouble codes and test the system to ensure the issue has been resolved.

Cost to Fix B1902

The cost of repairing a short to ground in the Front Pretensioner Squib Right Circuit can vary depending on the specific cause of the issue and the cost of parts and labor. In general, this type of repair can range from $200 to $500 or more. It's important to note that labor rates can vary significantly, so it's advisable to check with local auto repair shops for a more accurate estimate based on your location and vehicle model.

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Code B1902 Information for Specific Makes

  • B1902 Lexus — Short to Ground in Front Pretensioner Squib Right Circuit
  • B1902 Scion — Short to Ground in Front Pretensioner Squib Right Circuit
  • B1902 Toyota — Short to Ground 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 B1902 Code

1. What are common symptoms of OBDII code B1902 (Short to Ground in Front Pretensioner Squib Right Circuit)?

- The common symptoms include the airbag warning light staying illuminated on the dashboard and potential non-deployment of the front right airbag during a collision.

2. What are possible causes of OBDII code B1902?

- Possible causes include a short to ground in the front pretensioner squib right circuit, damaged wiring or connectors in the circuit, or a faulty pretensioner squib right component.

3. How can I diagnose the OBDII code B1902?

- Diagnosing the code may involve using an OBDII scanner to read the fault codes, conducting a visual inspection of the wiring and connectors in the front pretensioner squib right circuit, and performing continuity tests to pinpoint the short to ground.

4. Can I drive my vehicle with OBDII code B1902 present?

- It is not recommended to drive the vehicle with an active B1902 code, as it indicates a potential issue with the airbag system, which could compromise safety in the event of a collision.

5. How can I repair OBDII code B1902?

- Repairing the B1902 code may involve repairing or replacing damaged wiring or connectors in the front pretensioner squib right circuit, or replacing the faulty pretensioner squib right component as needed.

6. Is it safe to reset the OBDII code B1902 without fixing the underlying issue?

- It is not recommended to reset the code without addressing the root cause, as it could lead to ongoing safety concerns with the airbag system.

7. Is OBDII code B1902 a common issue in certain vehicle models?

- The occurrence of B1902 may vary depending on the vehicle make and model, but short to ground issues in airbag circuits can be encountered in various vehicles.

8. Can a DIY enthusiast fix OBDII code B1902 at home?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the B1902 code at home, but caution is advised when working on airbag systems.

9. How much does it typically cost to repair OBDII code B1902 at a professional auto repair shop?

- The cost of repairing B1902 can vary depending on the extent of the issue, but it may involve diagnostic fees, labor costs, and the price of any replacement parts needed.

10. Are there any safety precautions to keep in mind when working on OBDII code B1902?

- When working on the airbag system related to B1902, it is crucial to disconnect the vehicle's battery and follow proper safety procedures to avoid accidental airbag deployment.

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