B1861 Lexus Code - Open in Driver Side Knee Airbag Squib Circuit
Quick Answer
The Driver Side Knee Airbag Squib Circuit consists of the Center Airbag Sensor Assembly and the Driver Side Knee Airbag Assembly. Common causes include Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib), Driver Side Knee Airbag Assembly harness is open or shorted, Driver Side Knee Airbag Assembly 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
- B1861 Lexus indicates Open in Driver Side Knee Airbag Squib Circuit.
- Common causes
- Common causes include Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib), Driver Side Knee Airbag Assembly harness is open or shorted, Driver Side Knee Airbag Assembly 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 B1861 Lexus Description
What are the Possible Causes of the DTC B1861 Lexus?
- Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib)
- Driver Side Knee Airbag Assembly harness is open or shorted
- Driver Side Knee Airbag Assembly circuit poor electrical connection
- Faulty Center Airbag Sensor Assembly
How to Fix the DTC B1861 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 B1861 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 B1861 Lexus Code
1. What does the OBDII code B1861 mean on a Lexus?
The code B1861 indicates an open circuit in the driver-side knee airbag squib, which is part of the airbag deployment system.
2. What are the common symptoms of the B1861 code?
The airbag warning light will illuminate on the dashboard, and the driver-side knee airbag may not function properly during a collision.
3. What causes the B1861 code in a Lexus?
Common causes include damaged wiring, a disconnected or loose connector, a faulty knee airbag squib, or a malfunctioning airbag control module.
4. Is it safe to drive with the B1861 code on my Lexus?
Driving with this code is not recommended, as it indicates a potential malfunction in the airbag system, which could compromise safety in an accident.
5. How can I diagnose the B1861 code?
Diagnose the code by inspecting the wiring and connectors for damage or disconnection and using a scan tool to verify circuit continuity and resistance in the knee airbag squib.
6. Can I reset the B1861 code without fixing the problem?
Resetting the code without addressing the underlying issue will likely cause the code to reappear, as the fault in the circuit remains unresolved.
7. What repairs can fix the B1861 code?
Repairs may include reconnecting loose connectors, repairing or replacing damaged wiring, replacing the driver-side knee airbag squib, or servicing the airbag control module.
8. How much does it cost to fix the B1861 code on a Lexus?
The cost depends on the specific issue but can range from $100 for wiring repairs to $1,000 or more if the airbag module or squib needs replacement.
9. Can I fix the B1861 code myself?
If you have experience with automotive electronics and access to proper tools, you can attempt basic repairs like checking connectors and wiring. However, airbag systems are sensitive and may require professional service.
10. Does the B1861 code always mean the airbag squib is faulty?
No, the code can also be triggered by issues in the wiring, connectors, or airbag control module, so a thorough diagnosis is essential.
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