I have a jvc kd-ar880 car stereo installed in my 2007 VW Passat. I installed it myself & it's been installed since about 2010 with several accessories; bluetooth, SIRIUS and CD changer. All has been working great. Suddenly, this morning the main head unit won't turn on when I start the car. Therefore, I guess I am gonna have to diagnose the issue.

One simple thing I plan to do is pull the head unit out and swap it back with the factory radio. If this factory radio works, then I would think something is going on with the main jvc head unit. Of course, I will also check all the power wiring harness connections as well.

The only other issue I am thinking of checking is the car's fuse for the radio (need to figure out which one). Also maybe the fuse on the JVC radio as well. Any other suggestions on how to diagnose this power issue and/or what may be going on here?