DIY: access hidden menus on BRZ head unit
 

People seem to have issues doing this. It's very easy. It involves the three hard buttons to the left of the screen. You press and hold one and then add another one (either top to bottom or bottom to top) and wait a sec and you are there.

Press and hold the audio button to get back to normal operation.

I made a video to help out:
[ame="http://www.youtube.com/watch?v=NwxPdGn7wNA"]Subaru BRZ head unit diagnostic and other hidden menu - YouTube[/ame]