B1857 Lexus Code - Short To Ground In Rear Side Squib Left Circuit
Quick Answer
The Rear Side Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side Airbag Assembly Left (LH). Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side Airbag Assembly Left circuit poor electrical connection. 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
- B1857 Lexus indicates Short To Ground In Rear Side Squib Left Circuit.
- Common causes
- Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side Airbag Assembly Left circuit poor electrical connection.
- 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.
Code B1857 Lexus Description
What are the Possible Causes of the DTC B1857 Lexus?
- Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit)
- Rear Seat Side Airbag Assembly Left harness is open or shorted
- Rear Seat Side Airbag Assembly Left circuit poor electrical connection
- Faulty Center Airbag Sensor Assembly
How to Fix the DTC B1857 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 B1857 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.
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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.
Frequently Asked Questions about B1857 Lexus Code
1. What does the OBDII code B1857 mean on a Lexus?
The code B1857 indicates a short to ground in the rear side squib left circuit, which is part of the vehicle's airbag system.
2. What are the common symptoms of the B1857 code in a Lexus?
You may notice the airbag warning light illuminated on the dashboard and that the airbag system may be disabled for safety reasons.
3. What causes the B1857 code to appear in a Lexus?
This code is typically caused by damaged wiring, a faulty rear side airbag, a short circuit to ground, or a defective airbag control module.
4. Can I still drive my Lexus with the B1857 code active?
While the vehicle may still be drivable, the airbag system could be compromised, posing a safety risk in the event of a collision.
5. How do I diagnose the B1857 code in a Lexus?
Diagnosis involves inspecting the rear side squib left circuit for damaged wires, checking for loose connections, and testing the airbag control module.
6. How can I fix the B1857 code in a Lexus?
Repairs may include repairing or replacing damaged wiring, ensuring proper connections, or replacing a faulty airbag or control module.
7. How much does it cost to repair the B1857 code in a Lexus?
Repair costs vary but can range from $100 for minor wiring repairs to over $1,000 if the airbag or control module needs replacement.
8. Can I reset the B1857 code without fixing the issue?
Resetting the code without addressing the root cause is not recommended, as the airbag system may remain non-functional.
9. Is the B1857 code covered under warranty for my Lexus?
Coverage depends on your warranty terms and the age of the vehicle; check with your dealer for details.
10. Can a faulty clock spring cause the B1857 code in a Lexus?
No, the clock spring is unrelated to the rear side squib circuit and would not typically cause this code.
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