My 07 has the rear backup sensors. If I replace the radio (its dead) with an aftermarket, will the sensors still work? Arent the sensors sound and display tied to the radio?

I have an 07 S60 with a HU-850 factory radio that just died on me. My car also has the backup sensors on the rear bumper. Looking to replace radio with after-market since I can get a better radio for the money.
Plus, it is very hard to find an HU-850 replacement that is not used and costs as much as ...