I recently purchased an Entune Premium stereo through eBay and installed it on my Rav4 EXL 2018. Works great! Except the volume control will not work (it won’t turn up or down) the button works for power so I’m confused? I read where an amplifier has to be used for the upgrade I think? Do the 2018s not come with one? I noticed a 12pin connection in the back with nothing connected, and nothing to connect? Or did I just buy a busted radio 😅?