W211 front pre-fuse locations | Mercedes-Benz Owners' Forums Apr 14, 2016I've connected Star and it suggested pre-fuses and relay contacts. My first problem was locating the Pre-fuse as they aren't where WIS (or mersum1es links) suggested. I still can't locate it. I haven't been able to remove the relay due to car being on the street and bad weather, but I've checked voltages at the relay from under the scuttle.[PDF] W211 Fuses as per Interior Fuse Box (F34) Dashboard – Left side F021 30 A ATO Door Control Unit - Right Rear F022 30 A ATO Door Control Unit - Right Front (Include Folding Mirror??) F023 30 A ATO Passenger seat adjustable/memory F024 25 A ATO (KEYLESS GO) F025 20 A ATO (Additional heating with/without remote start) F026 7.5 A ATO (CD changer) F027 Reserve ATO 02-04 prefuse box? | Mercedes-Benz Forum Yes, the W203 has a pre-fuse box - it's under the hood, on the passenger side, in front of the battery where the red plastic cap covering the positive jump terminal is located. The fuses are listed here: Benzbits: W203 Fuses Show Full Signature. Birmingham, Alabama (USA) - 2011 SL550, 2011 C300 front pre fuse box on e320 cdi | MBClub UK - Bringing Jun 15, 2016Hi Just done mine on a W211 05 E320 cdi. With Xenon headlamps I think this only applies to cars with Xenon headlamps On rhd cars the pre fuse board is under the mats on the drivers side.