Fuse box Audi A6 (C6) - fusesdiagram Locate fuse and relay. Fuse box diagram. Identifying and legend fuse box Audi A6 (C6) 2004-2011. Interior Fuse Box Location: 2002-2008 Audi A4 Quattro 2006 Some Audis have multiple interior fuse boxes including in the trunk - the video above will show you where the interior fuse box of your 2006 A4 Quattro is located. If your A4 Quattro has many options like a sunroof, navigation, heated seats, etc, the more fuses it has.