AutoCodes – Lexus – B1805 Lexus

B1805 Lexus Code - Short In Front Passenger Side Squib Circuit

Quick Answer

The Front Passenger Side Squib Circuit consists of the Center Airbag Sensor Assembly and the Front Passenger Airbag Assembly. Common causes include Instrument panel wire, Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib), Front Passenger Airbag Assembly harness is open or shorted. 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: B1805 Lexus indicates Short In Front Passenger Side Squib Circuit.
Common causes: Common causes include Instrument panel wire, Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib), Front Passenger Airbag Assembly harness is open or shorted.
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 2,073

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 Nov 25, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1805 Lexus Description

The Front Passenger Side Squib Circuit consists of the Center Airbag Sensor Assembly and the Front Passenger Airbag Assembly. The circuit signals the Supplemental Restraint System (SRS) to deploy when deployment conditions are met. The Diagnostic Trouble Code (DTC) is recorded when the airbag sensor assembly detects a line short circuit signal 5 times in the Front Passenger Side Squib Circuit during the primary check.

OBDII Code B1805 Lexus - Short In Front Passenger Side Squib Circuit - AutoCodes.com — B1805 Lexus Code - Short In Front Passenger Side Squib Circuit

What does this mean?

What are the Possible Causes of the DTC B1805 Lexus?

Instrument panel wire
Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib)
Front Passenger Airbag Assembly harness is open or shorted
Front Passenger Airbag Assembly circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1805 Lexus?

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 B1805 Lexus 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 B1805 Lexus code?

Need more information on how to fix the B1805 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1805 Lexus 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 B1805 Lexus Code

1. What are common symptoms of OBDII code B1805 in a Lexus related to a short in the front passenger side squib circuit?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential non-deployment of the front passenger airbag during a collision.

2. What can cause the OBDII code B1805 to trigger in a Lexus?

- The code B1805 is typically triggered by a short circuit in the front passenger side squib circuit, which can be caused by damaged wiring, a faulty airbag squib, or a loose connection.

3. How can I diagnose the OBDII code B1805 in my Lexus with a short in the front passenger side squib circuit?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the wiring and connections in the front passenger side airbag system, and testing the airbag squib for continuity.

4. Is it safe to drive my Lexus with the OBDII code B1805 showing a short in the front passenger side squib circuit?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the front passenger airbag system, which could compromise occupant safety in the event of a collision.

5. Can I repair the OBDII code B1805 related to a short in the front passenger side squib circuit in my Lexus myself?

- Due to the safety implications of airbag systems, it is recommended to have this issue diagnosed and repaired by a qualified automotive technician with experience in airbag system repairs.

6. How much does it typically cost to repair the OBDII code B1805 with a short in the front passenger side squib circuit in a Lexus?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive measures I can take to avoid the OBDII code B1805 related to a short in the front passenger side squib circuit in my Lexus?

- Regularly inspecting the airbag system components, avoiding water damage to wiring, and ensuring proper installation of aftermarket accessories can help prevent issues leading to this code.

8. Can resetting the OBDII system clear the B1805 code in a Lexus with a short in the front passenger side squib circuit?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the short circuit is not addressed, the code is likely to reappear.

9. How long does it typically take to repair the OBDII code B1805 related to a short in the front passenger side squib circuit in a Lexus?

- The repair time can vary based on the exact cause of the issue, but it may take a few hours to a full day to diagnose and repair the front passenger side squib circuit.

10. Is the OBDII code B1805 with a short in the front passenger side squib circuit a common issue in Lexus vehicles?

- While not extremely common, issues with the front passenger side squib circuit leading to the B1805 code can occur in Lexus vehicles, especially in older models or those with high mileage.