[venusfan]

just an update:

I located the fusebox and found the paperwork for the fuses and checked the ones for the radio and indeed a 20A at #192 was tripped. I changed it and the head unit came back to life. I was happy it was only a fuse so I just put everything back together and took it to an audio shop for them to finish the installation. I suspect the fuse tripped because I didn't disconnect the battery

Here's the end result. It is so much better than before.