Fuse box Audi A4 (B6) Locate fuse and relay. Fuse box diagram. Identifying and legend fuse box Audi A4 (B6) 2000-2006. Is there a fuse box under the hood? - AudiWorld Forums Sep 29, 2009A4 (B5 Platform) Discussion - Is there a fuse box under the hood? - Hey guys, I'm trying to troubleshoot a radio problem (it has no power - long story, gf was driving car while I was out of town, she left the aftermarket HID lights on and her friend jumped it but crossed the polarities! doh!) anyway, I checked all the..