It's FOSS published a quick tutorial showing you how to enabling Bluetooth on Arch Linux.
Enabling Bluetooth on Arch Linux
Bluetooth not working on Arch Linux? Here's what worked for me along with a few additional tips on troubleshooting Bluetooth issue on Arch.
So, I installed Arch Linux quite easily thanks to the archinstall script. After I started using it and exploring it, I tried using my Bluetooth headphones only to notice that the Bluetooth was not working. I could see the Bluetooth option but I just could not enable it. Clicking the toggle button kept on switching back to disabled.
