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Engine-Codes – Generic – B1185

B1185 Code - Left Front Seat Belt Buckle Pre-Tensioner Short

Quick Answer

The B1185 diagnostic trouble code (DTC) indicates a problem with the left front seat belt buckle pre-tensioner short circuit. Common causes include Wiring damage or corrosion in the left front seat belt buckle pre-tensioner circuit, Faulty seat belt buckle pre-tensioner, Loose or damaged electrical connections in the system. 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
B1185 indicates Left Front Seat Belt Buckle Pre-Tensioner Short.
Common causes
Common causes include Wiring damage or corrosion in the left front seat belt buckle pre-tensioner circuit, Faulty seat belt buckle pre-tensioner, Loose or damaged electrical connections in the system.
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
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Code B1185 Description

The B1185 diagnostic trouble code (DTC) indicates a problem with the left front seat belt buckle pre-tensioner short circuit. The seat belt pre-tensioner is a safety feature designed to retract the seat belt in the event of a collision, reducing the risk of injury by restraining the occupant securely in their seat. When the pre-tensioner system detects a crash, it triggers a small explosive charge that tightens the seat belt to hold the occupant in place.

OBDII Code B1185 - Left Front Seat Belt Buckle Pre-Tensioner Short
B1185 Code - Left Front Seat Belt Buckle Pre-Tensioner Short

Common Causes of B1185

  1. Wiring damage or corrosion in the left front seat belt buckle pre-tensioner circuit.
  2. Faulty seat belt buckle pre-tensioner.
  3. Loose or damaged electrical connections in the system.
  4. Malfunctioning seat belt pre-tensioner control module.
  5. Impact or damage to the seat belt buckle assembly.

Symptoms of B1185

  1. Illuminated airbag warning light on the dashboard.
  2. Seat belt warning light may be illuminated.
  3. Audible warning chime indicating a fault with the seat belt system.
  4. Seat belt may not retract or function properly.
  5. In severe cases, the airbag system may be disabled.

How to Fix B1185

  1. Diagnose the specific cause of the short circuit in the left front seat belt buckle pre-tensioner circuit using a diagnostic scan tool.
  2. Inspect the wiring and electrical connections in the seat belt pre-tensioner system for damage or corrosion.
  3. Replace the faulty seat belt buckle pre-tensioner if necessary.
  4. Clear the DTC from the vehicle's memory using the diagnostic scan tool.
  5. Test the seat belt pre-tensioner system to ensure it is functioning correctly after repairs have been completed.

Cost to Fix B1185

The cost of repairing a B1185 DTC related to a left front seat belt buckle pre-tensioner short can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of parts for a seat belt pre-tensioner repair can range from $100 to $300, while labor costs can add another $100 to $200 to the total bill. Overall, the total repair cost for this issue is likely to fall within the range of $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary widely, so it is advisable to check with local providers for a more accurate estimate.

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Code B1185 Information for Specific Makes

  • B1185 Lexus — Short In Passenger Side Air Bag Second Stage Squib Circuit
  • B1185 Nissan — Left Front Seat Belt Buckle Pre-Tensioner Short
  • B1185 Scion — Short In Passenger Side Air Bag Second Stage Squib Circuit
  • B1185 Toyota — Short In Passenger Side Air Bag Second Stage Squib 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 B1185 Code

1. What does the OBDII code B1185 mean?

B1185 indicates a short circuit in the left front seat belt buckle pre-tensioner circuit, often related to the vehicle's safety restraint system.

2. What are the common symptoms of code B1185?

The airbag warning light may illuminate, and the seat belt pre-tensioner may not function properly in the event of a collision.

3. What causes the B1185 code?

Possible causes include damaged wiring, a faulty seat belt buckle pre-tensioner, poor electrical connections, or a malfunctioning airbag control module.

4. Can I still drive with a B1185 code?

While the car may be drivable, the safety restraint system may not function correctly, increasing the risk of injury during a crash.

5. How is the B1185 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage or corrosion, and test the seat belt buckle pre-tensioner for proper operation.

6. How do you fix a B1185 code?

Repairs may involve replacing the seat belt buckle pre-tensioner, repairing or replacing damaged wiring, or addressing issues with the airbag control module.

7. How much does it cost to fix a B1185 code?

Repair costs vary but typically range from $150 to $500, depending on whether the pre-tensioner or wiring needs replacement.

8. Can a B1185 code trigger the airbag warning light?

Yes, this code often causes the airbag warning light to illuminate as it indicates a fault in the safety restraint system.

9. Is a B1185 code a serious issue?

Yes, it is a serious issue because it compromises the functionality of the seat belt pre-tensioner, which is a critical safety feature.

10. Can I clear the B1185 code without repairs?

Clearing the code without addressing the root cause may temporarily turn off the warning light, but the issue will likely return and compromise safety.

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