E30 Fuse Box Diagram, High Resolution, Printable | E30 Gruppe The fuse box is where you want to start with many problems you may encounter with your E30. While relays rarely go bad, it’s still very possible. One thing you can always do to test a relay easily is if your Horn is working, put that relay from K2 into the Low Beam K4, or other slot which you’re trying to get working. Download the E30 fuseAuthor: Tone bmw fuse box | eBay Find great deals on eBay for bmw fuse box. Shop with confidence. Skip to main content. eBay Logo: BMW E30 fuse box fusebox with relays and cover 3 series. Pre-Owned. $60. or Best Offer. Body Control Module Fuse Box BMW E82 E88 OEM 61359187533 135i 128i See more like this.