BMW X3 E83 (2003 to 2010) Fuse Box Diagrams, Location and Fuse box location and amperage list. There are 2 fuse boxes on the BMW X3 E83: 1 – Fuse Box located in the engine compartment. To access the engine compartment fuse box, open the hood and look on the right hand side near the windscreen. You’ll see a cover for the fuse box. Explanation of Fuse Assignment Symbols? - Bimmerfest - BMW Nov 14, 2011The symbols I'm talking about are the ones used for the fuse assignment cards that are installed in the covers of the fuse box. For example, here's the trunk fuses card for a 2008 535xi E61: What I've been able to do so far is look in owner's manuals and find symbols displayed next to certain function descriptions.