These sensors are the core components of Volvo's advanced driver-assistance system known as BLIS (Blind Spot Information System) and CTA (Cross Traffic Alert). They are designed to be a direct replacement for the factory-installed units on the specified vehicle models.
Operating Frequency: These sensors operate in the 24 GHz or 77 GHz radar frequency band to detect moving vehicles.
Blind Spot Information System (BLIS): The primary function is to monitor the blind spots on both sides of the vehicle. When a vehicle enters the driver's blind spot, the corresponding side's sensor detects it and triggers a visual alert, typically an amber warning light integrated into the side-view mirror. This helps to prevent collisions during lane changes.
Cross Traffic Alert (CTA): This is another critical safety feature that utilizes the same radar sensors.
While part numbers can vary slightly based on the specific model year and software version, some commonly associated OEM part numbers for these sensors include:
31419357
31354500
32243252
It is always recommended to verify the exact part number with the vehicle's VIN (Vehicle Identification Number) before purchasing to ensure compatibility.
These radar sensors are typically mounted behind the rear bumper cover on the corners of the vehicle. It is important to note that after installation, the new sensors will likely require software calibration by a certified Volvo dealership or a qualified automotive technician with the appropriate diagnostic tools. This calibration process ensures that the sensors are properly aimed and integrated with the vehicle's safety systems to function accurately. Failure to calibrate the sensors can result in false warnings or the system not working at all.