Nothing shows up on CarPlay available cars. The wheel just keeps going around.

If your car supports Carplay, plugging the iPhone into the USB socket should immediately cause it to show it on screen.

What model of Subaru is it?

Have you checked the users manual to see if there's something you need to do to enable it?

See here:

https://www.subaru.com/vehicles/features.html/applecarplay-starlink-apps-modal

https://www.autonationsubaruarapahoe.com/ownership/subaru-apple-carplay-setup.htm

Does your car actually Support Wireless carplay?

It will only show up there if it supports wireless carplay and is in pairing mode, or your phone is connected to it via USB.

https://www.subaruofauburn.com/how-to-connect-pair-your-iphone-using-apple-carplay-in-your-subaru---starlink.htm

Have you put the Subaru's entertainment system into Pairing mode?

Hello,

It should eventually work. You may have to "mess" with it.

Restart the car, restart the phone, disconnect and reconnect the cable etc. It took me a few tries to get it going :-)

Good luck.