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What Is the Lexus BSM Light?
If you’ve ever noticed the BSM light on your Lexus dashboard, you might be wondering what it means and if it requires immediate attention. The BSM (Blind Spot Monitor) system is an advanced driver-assist feature designed to enhance safety by detecting vehicles in your blind spots. However, when the BSM light stays on or starts flashing, it could indicate a potential issue that needs to be addressed.
In this guide, we’ll cover:
- The meaning of the Lexus BSM light
- Common reasons why the BSM light turns on
- How to troubleshoot and reset the BSM system
- Frequently asked questions about Lexus blind spot monitoring
Understanding the Lexus Blind Spot Monitor (BSM)
The Blind Spot Monitor (BSM) system in Lexus vehicles uses radar sensors to detect vehicles in adjacent lanes. When another vehicle enters your blind spot, the system illuminates a warning light on your side mirror.
How Does the Lexus BSM Work?
- Detects Vehicles in Your Blind Spot – The system monitors the area alongside and behind your car using radar sensors.
- Illuminates a Warning Light – If a vehicle is detected, a small light appears on your side mirror to warn you.
- Issues an Alert When You Signal – If you turn on your turn signal while a car is in your blind spot, the BSM light will flash as an extra warning.
Where Is the BSM Light Located?
- The primary BSM indicators are on the side mirrors.
- A BSM warning light may also appear on the dashboard if there is an issue with the system.
Why Is My Lexus BSM Light On?
Your Lexus BSM light may turn on for several reasons:
| Possible Cause | Description | How to Fix It |
|---|---|---|
| BSM System Is Off | The system was manually turned off. | Check the BSM button near the steering wheel and turn it on. |
| Blocked Sensors | Dirt, snow, or debris may be covering the radar sensors. | Clean the rear bumper sensors and mirrors. |
| Low Battery Voltage | A weak battery can cause sensor malfunctions. | Test the battery and replace it if needed. |
| Electrical or Wiring Issue | Faulty wiring may cause the BSM system to fail. | Have a professional inspect the wiring and connections. |
| System Malfunction | A software glitch or internal failure could trigger a warning light. | Reset the system or take the vehicle to a Lexus dealership. |
How to Fix Lexus BSM Light Issues
If your BSM light stays on or flashes unexpectedly, follow these troubleshooting steps to resolve the issue.
1. Turn the BSM System On/Off
Sometimes, the BSM system might have been accidentally turned off. To check and reactivate it:
- Locate the BSM button on the dashboard (usually near the steering wheel or center console).
- Press the button to toggle the system ON.
- If the BSM light disappears, the issue was simply that the system was turned off.
2. Clean the BSM Sensors
The BSM system relies on radar sensors, which are usually located inside the rear bumper. If they get covered with mud, snow, or dirt, the system may not function properly.
- Use a soft cloth and mild cleaner to wipe the sensors.
- Avoid using high-pressure water jets directly on the sensors.
- After cleaning, restart your Lexus to see if the warning light clears.
3. Check for Obstructions
If you’re parked near metal fences, walls, or other vehicles, your BSM system might detect false signals. Try these steps:
- Move your car away from large metallic objects.
- Drive at a moderate speed for a few minutes to allow the system to recalibrate.
- If the light disappears, the issue was likely interference from surrounding objects.
4. Reset the BSM System
If the BSM light remains on, a simple system reset may fix the issue:
Method 1: Using the Dashboard Menu
- Start the ignition (without pressing the brake).
- Navigate to Settings on the vehicle’s multi-information display.
- Select Vehicle Settings > Blind Spot Monitor > Reset System.
- Restart your car and check if the warning light is gone.
Method 2: Disconnecting the Battery
- Turn off your Lexus and pop the hood.
- Disconnect the negative battery terminal for about 5-10 minutes.
- Reconnect the battery and start the car.
- Check if the BSM warning light has disappeared.
5. Check for Software Updates
Lexus occasionally releases software updates that can improve the performance of safety systems like BSM. If your vehicle is experiencing persistent issues:
- Visit a Lexus dealership to check for software updates.
- Ensure all system settings are correctly configured in the infotainment system.
How to Reset the Lexus BSM Light
If you’ve tried troubleshooting but the BSM light is still on, you may need to reset the system. Here’s how:
Method 1: Using the Steering Wheel Controls
- Turn on the ignition (without starting the engine).
- Use the steering wheel controls to navigate to the Settings menu on the dashboard display.
- Scroll to Blind Spot Monitor and select Reset System.
- Restart your Lexus and check if the light has cleared.
Method 2: Using the Infotainment System
- Turn on your Lexus and go to the main screen.
- Tap on Settings, then select Safety & Driver Assistance.
- Find Blind Spot Monitor and tap Reset.
- Restart the car to see if the light has turned off.
Method 3: Disconnecting the Battery (Full Reset)
If the light remains on after trying the above methods, a hard reset may be necessary:
- Turn off the engine and open the hood.
- Use a wrench to disconnect the negative battery terminal.
- Wait 10-15 minutes before reconnecting the battery.
- Start the car and check if the BSM warning light has disappeared.
Lexus BSM Light FAQs
Why is my Lexus BSM light flashing?
A flashing BSM light usually means that a vehicle is detected in your blind spot and your turn signal is active. If the light keeps flashing without a turn signal, there may be an issue with the system.
Can I drive with the BSM light on?
Yes, but if the light remains on without reason, the BSM system may not be functioning properly. This means blind spot alerts won’t work, so use extra caution while driving.
How much does it cost to fix a Lexus BSM issue?
The cost depends on the problem:
| Issue | Estimated Cost |
|---|---|
| Sensor Cleaning | Free (DIY) |
| Software Update | $50 – $150 |
| Sensor Replacement | $250 – $600 |
| Wiring Repair | $100 – $300 |
Will resetting the BSM system fix the issue?
A reset can fix minor software glitches, but if the BSM sensors are damaged or blocked, a reset alone won’t solve the problem.
Final Thoughts
The Lexus BSM light is a helpful safety feature, but when it stays on unexpectedly, it can be frustrating. By following these troubleshooting and reset steps, you can fix minor BSM issues yourself. If the light remains on, it’s best to visit a Lexus service center for further diagnosis.
Need professional help? Schedule an appointment with a certified Lexus technician to ensure your Blind Spot Monitor is working correctly.