[NINFan]

Update: I took the radio out the other day. The fuse in the back is good, but I realized that even the lights on the dial are out. Is there another fuse somewhere? (Besides the one on the radio and the one in the fuse block under the hood.) I'm beginning to think it's the amp under the passenger seat and not the radio itself. VW replaced the amp under warranty when the car was new because it was freaking out when the iPhone was plugged in.
I also had to replace the battery the other day. I'm concerned that it's not a coincidence. Thinking that the radio issue is slow draining the battery - especially because when the problem surfaced, the radio was still popping with the key out.