Fuse box Audi A4 (B6) - fusesdiagram Locate fuse and relay. Fuse box diagram. Identifying and legend fuse box Audi A4 (B6) 2000-2006. SOLVED: Location of the audi a4 fuse box 2003 - Fixya Dec 26, 2009Check up dipped beam headlights fuse inside fuse box. For Audi A4 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram. If the dipped beam headlights fuse is OK, check up dipped beam headlights bulbs.