Where is the Blind-Spot Detection sensor on a Subaru?

In most current Subaru models, the Blind-Spot Detection (BSD) sensors are radar units mounted in the rear bumper corners, with warning indicators in the exterior side mirrors. The system works with Subaru's EyeSight driver-assist technology to monitor adjacent lanes and alert you when a vehicle is in your blind spot. This guide explains where to look and how the system appears across popular models as of 2024–2025.

How Blind-Spot Detection works in Subaru

Subaru's BSD uses radar sensors to monitor the lanes on either side of the vehicle. If another vehicle enters the monitored zone, you’ll typically see an amber indicator light in the corresponding side mirror, and in some situations you may also receive an audible alert. The feature is commonly paired with EyeSight for enhanced safety and is standard or optional on most recent models.

Where the sensors sit on most Subarus

Mirror indicator lights

The warning lights are usually built into the outer edge of each side mirror. When BSD detects a vehicle in the adjacent lane, the corresponding mirror’s indicator lights up to warn you.

Model-year variations

In newer Subaru models (roughly mid-2010s to present), the sensors themselves are located in the rear bumper corners, behind the bumper cover near the left and right taillights. Some older or special trim packages may show minor placement differences, but rear bumper sensors are standard on current-generation Subarus.

Common BSD sensor locations and related indicators include:

• Rear bumper corners (left and right): dual radar sensors embedded behind the bumper fascia near the taillights.


• Mirror indicators: amber lights in the exterior side mirrors illuminate when a vehicle is detected in a blind spot.


• Variations by model year: sensor packaging can differ slightly, but the rear-bumper radar approach is standard on modern Subarus.

When the sensors are clean and unobstructed, the BSD system should reliably alert you to vehicles in your blind spots. If warnings are not appearing, have a Subaru dealer diagnose the system to verify sensor operation and EyeSight integration.

Maintenance and common issues

To maintain proper BSD function, keep the rear bumper sensors clean and check for damage. If the system isn't functioning, you can perform a basic check below, but a dealer diagnostic may be necessary.

For hands-on troubleshooting, try these steps:

1. Clean the rear bumper sensors with a soft cloth; they're small circular modules recessed into the bumper corners.


2. Inspect the bumper area for damage or misalignment that could affect sensor readings.


3. Ensure EyeSight is active in the vehicle settings; BSD typically operates in coordination with EyeSight.


4. Test the system by driving with another vehicle in adjacent lanes and verify the mirror indicator lights illuminate when appropriate.


5. If issues persist, schedule service with a Subaru dealer for calibration or replacement of sensors.

Regular care helps keep BSD reliable; seek professional service if anomalies persist.

Summary

Most up-to-date Subarus place Blind-Spot Detection sensors in the rear bumper corners, with amber indicator lights in the exterior side mirrors to warn of vehicles in adjacent lanes. The system works with EyeSight to enhance awareness. Keep sensors clean and undamaged, and seek dealership service if warnings stop functioning.

Where is the blind spot monitor sensor located?

Blind spot monitor sensors are typically located on the rear sides of the vehicle, concealed behind the rear bumper cover. Some systems may also use cameras under the side view mirrors or utilize sensors in the rear quarter panel or even tail lights.
 
This video shows the location of the blind spot sensors on a Subaru Forester: 56sAlex PrestigiacomoYouTube · Jun 8, 2021
Common locations

• Behind the rear bumper: This is the most common location for the radar-based systems that many modern cars use. There is a sensor on each side of the rear of the vehicle. 
• In the side view mirrors: Some newer systems use cameras located on the underside of each side view mirror. 
• In the tail lights or quarter panel: In some vehicles, the sensors are integrated into the tail lights or the body panel behind the bumper. 

This video shows how to locate the blind spot sensors on a Jeep Renegade: 58sDigital Glove BoxYouTube · Jun 15, 2025
How to identify them

• Radar sensors: These are usually hidden and not visible from the outside, though they are often located near the rear reflectors. 
• Camera systems: If your car uses cameras, they will be a small lens on the underside of the side view mirrors. 
• Check your owner's manual: For the most accurate information, consult your car's owner's manual, which will detail the exact location for your specific make and model. 

How to clean a blind spot sensor?

Use isopropyl alcohol and a clean rag and clean all around the blind spot monitor. The back of the monitor must be as clean as possible so sealant will adhere to it. Let the area dry completely before attempting to seal the monitor and wiring.

Where is the blind spot sensor on a Subaru?

And I personally hate that because sometimes I can't see it if there is a vehicle in my mirror. Also some of the Subarus. You did notice that you had a larger emblem on the mirror cap. But personally.

How to fix blind spot info system problem?

To fix a blind spot info system problem, first check for obstructions like dirt, mud, or accessories on the rear bumper sensors and clean them gently with a soft cloth. If the sensors are clean, try a system reset by turning the car off, waiting about 30 seconds, and then driving above 101010 mph to see if the system reinitializes. If the issue persists, a more advanced fix may be needed, such as checking for loose or corroded wiring, using an OBD2 scanner to clear error codes, or consulting a professional for sensor alignment or replacement. 
Initial troubleshooting steps

• Clean the sensors: Gently wipe the rear bumper sensors with a soft cloth to remove any dirt, mud, or water. 
• Check for obstructions: Make sure no aftermarket accessories, like bike racks or large stickers, are blocking the sensors. 
• Try a reset: Turn the ignition off, wait about 30 seconds, and then restart the car. Drive above 101010 mph to allow the system to reinitialize. 
• Disconnect the battery: As a more advanced reset, disconnect the negative battery terminal for 10 minutes, then reconnect it to reset the electronic control modules. 

Advanced troubleshooting

• Scan for codes: Use an OBD2 scanner to check for diagnostic trouble codes (DTCs) that can help pinpoint sensor failures. 
• Inspect wiring: Check the sensor and mirror wiring harnesses for loose or corroded connections. 
• Check sensor alignment: Ensure the sensors are properly aligned, as misalignment can cause errors. 

When to seek professional help

• If the issue began after a strong impact to the rear bumper, have a professional inspect the system. 
• If you find a persistent fault code after cleaning and resetting, or if you suspect a damaged sensor or wiring, a dealer or qualified technician should diagnose and repair the problem. 
• If the system continues to malfunction, the issue could be a faulty mirror sensor module or a problem with the radar modules, which may require replacement.