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B1858 Lexus Code - Short To Positive In Rear Side Squib Left Circuit

Quick Answer

The B1858 Lexus diagnostic trouble code indicates a short to positive in the rear side squib left circuit. Common causes include Damaged wiring or connectors in the rear side squib left circuit, Faulty squib module, Corrosion in the electrical connections. 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
B1858 Lexus indicates Short To Positive In Rear Side Squib Left Circuit.
Common causes
Common causes include Damaged wiring or connectors in the rear side squib left circuit, Faulty squib module, Corrosion in the electrical connections.
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 14, 2024
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Code B1858 Lexus Description

The B1858 Lexus diagnostic trouble code indicates a short to positive in the rear side squib left circuit. In simpler terms, this means that there is an electrical issue in the left side airbag system of the vehicle. The squib is a component that initiates the deployment of the airbag in the event of a collision. A short to positive in this circuit can prevent the airbag from deploying properly, compromising the safety of the vehicle occupants.

OBDII Code B1858 Lexus - Short To Positive In Rear Side Squib Left Circuit
B1858 Lexus Code - Short To Positive In Rear Side Squib Left Circuit

Common Causes of B1858 Lexus

  1. Damaged wiring or connectors in the rear side squib left circuit
  2. Faulty squib module
  3. Corrosion in the electrical connections
  4. Impact damage to the left side airbag system
  5. Electrical short circuit in the system

Symptoms of B1858 Lexus

  1. Airbag warning light illuminated on the dashboard
  2. Inoperative left side airbag
  3. Intermittent airbag deployment
  4. Faulty horn or cruise control functions
  5. Electrical burning smell in the vehicle

How to Fix B1858 Lexus

  1. Begin by disconnecting the vehicle's battery to prevent any electrical mishaps.
  2. Inspect the wiring and connectors in the rear side squib left circuit for any damage or corrosion. Replace any faulty components.
  3. Check the squib module for proper functionality. If it is found to be defective, replace it with a new one.
  4. Clear the diagnostic trouble code from the vehicle's system using a compatible scan tool.
  5. Reconnect the battery and test the airbag system to ensure proper operation.

Cost to Fix B1858 Lexus

The cost of repairing a short to positive in the rear side squib left circuit can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary significantly, so it is advisable to obtain quotes from multiple sources to ensure a competitive price. Additionally, the cost of diagnosis and any additional repairs that may be required should be factored into the overall estimate.

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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 B1858 Lexus Code

1. What are the common symptoms of OBDII code B1858 in a Lexus related to a short to positive in the rear side squib left circuit?

The common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the left side airbag system.

2. What are some possible causes of OBDII code B1858 in a Lexus indicating a short to positive in the rear side squib left circuit?

Potential causes include damaged wiring, a faulty squib (airbag) module, a poor electrical connection, or a blown fuse in the circuit.

3. How can I diagnose OBDII code B1858 in my Lexus related to a short to positive in the rear side squib left circuit?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the wiring and connections in the left side airbag circuit, and testing the squib module for proper functionality.

4. Is it safe to drive my Lexus with OBDII code B1858 indicating a short to positive in the rear side squib left circuit?

It is not recommended to drive the vehicle with this fault code present, as it may affect the proper deployment of the airbag in the event of a collision.

5. How can I repair OBDII code B1858 in my Lexus related to a short to positive in the rear side squib left circuit?

Repair options may include repairing or replacing damaged wiring, replacing the faulty squib module, ensuring proper electrical connections, and resetting the fault code with a scan tool.

6. Can I reset OBDII code B1858 in my Lexus indicating a short to positive in the rear side squib left circuit myself?

While you can attempt to reset the fault code using a scan tool, it is important to address the underlying issue causing the code to prevent it from recurring.

7. Are there any safety precautions to consider when working on OBDII code B1858 in a Lexus involving a short to positive in the rear side squib left circuit?

It is crucial to disconnect the vehicle's battery before working on any airbag-related components to avoid accidental deployment and ensure safety.

8. What should I do if OBDII code B1858 keeps returning in my Lexus despite repairs?

If the fault code persists after repairs, consider seeking assistance from a professional technician or dealership to diagnose and address the issue accurately.

9. How much does it typically cost to repair OBDII code B1858 in a Lexus related to a short to positive in the rear side squib left circuit?

The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts, labor, and diagnostic services.

10. Can OBDII code B1858 in a Lexus indicating a short to positive in the rear side squib left circuit affect the overall safety of the vehicle?

Yes, this fault code can impact the proper functioning of the airbag system, potentially compromising the safety of the vehicle's occupants in the event of a collision.

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