B2071 Lexus Code - Stop Light Control Relay Malfunction
Quick Answer
This Diagnostic Trouble Code (DTC) is stored when the master cylinder solenoid (Skid Control ECU) detects that the brake light relay is malfunctioning and transmits this to the seat belt control ECU via CAN communication. Common causes include Faulty Vehicle Stability Control System, Faulty Seat Belt Control ECU. 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
- B2071 Lexus indicates Stop Light Control Relay Malfunction.
- Common causes
- Common causes include Faulty Vehicle Stability Control System, Faulty Seat Belt Control ECU.
- 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 B2071 Lexus Description
What are the Possible Causes of the DTC B2071 Lexus?
- Faulty Vehicle Stability Control System
- Faulty Seat Belt Control ECU
How to Fix the DTC B2071 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 B2071 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 B2071 Lexus Code
1. What are the common symptoms of OBDII code B2071 in a Lexus related to Stop Light Control Relay Malfunction?
The common symptoms include non-functional brake lights, intermittent brake light operation, and dashboard warning lights related to the brake system.
2. What could cause the OBDII code B2071 related to Stop Light Control Relay Malfunction in a Lexus?
Possible causes include a faulty stop light control relay, damaged wiring or connectors in the brake light circuit, or a problem with the brake light switch.
3. How can I diagnose the OBDII code B2071 in my Lexus for Stop Light Control Relay Malfunction?
You can use a diagnostic scanner to retrieve the specific code, inspect the brake light circuit for any visible damage, and test the stop light control relay for proper functionality.
4. Can I still drive my Lexus with the OBDII code B2071 related to Stop Light Control Relay Malfunction?
It is not recommended to drive the vehicle with faulty brake lights, as it can pose a safety risk to you and other drivers on the road.
5. What are the repair options for fixing OBDII code B2071 in a Lexus due to Stop Light Control Relay Malfunction?
Repair options include replacing the faulty stop light control relay, repairing any damaged wiring or connectors, and ensuring the brake light switch is functioning correctly.
6. Is it possible to reset the OBDII code B2071 related to Stop Light Control Relay Malfunction in my Lexus?
Resetting the code may temporarily turn off the warning light, but it will reappear if the underlying issue causing the malfunction is not addressed.
7. How much does it typically cost to repair OBDII code B2071 in a Lexus for Stop Light Control Relay Malfunction?
The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.
8. Can a DIY enthusiast fix OBDII code B2071 related to Stop Light Control Relay Malfunction in a Lexus?
If you have experience working on automotive electrical systems, you may be able to diagnose and repair the issue yourself. However, it is recommended to seek professional help if you are unsure.
9. Will OBDII code B2071 in a Lexus affect the vehicle's overall performance?
While the code itself may not affect performance, the underlying issue with the brake lights can impact safety and visibility on the road.
10. How often does the OBDII code B2071 related to Stop Light Control Relay Malfunction occur in Lexus vehicles?
The occurrence of this code can vary, but it is not an uncommon issue in Lexus vehicles with faulty stop light control relays or brake light circuit problems.
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