So I Have 2003 a4 1.8 T auto

The radio was work before the battery was boosted .

I thought it was a fuse but I only know of one fuse panel which is by the driver door.

All the fuses checked out fine but still no radio power or the door locks not working with remote.

 

there is a 10amp fuse on the back of the radio as well its a regular blade fuse you just have to pull the radio out to get to it.