My Prius has a slot for SD card in the audio and video system. I copied some mp3 to the sd card and inserted it to the slot. It doesn't play the mp3 and I can't find how to get them played. Any help is highly appreciated
I assume that you mean a USB slot? Either way, make sure they are .mp3 files, and are not in any folder on the device. Just put the .mp3's directly onto the device. No folders. Not sure if this makes a difference or not. My guess is that your files may not be .mp3's. Maybe .ACC .WMA or some other junk format.
The slot the OP is referring to not available on US cars. Can't remember what it's for, but I don't think it's for music playback.