I got Mercedes S500. Rear fuse box under the rear seat Oct 28, 2010I got Mercedes S500.Rear fuse box under the rear seat reads only One Volt. I accidentaly touch the ground with with this fuse box trying to put it in it's place checking relays on this box Spark probably blown fuse, i believe in X4/22 which according to diagram is a terminal block and fuse box (circuit 30z). I do not know how to locate this X4/22 physical locations to check this fuse?eurotec : Hi, I've attached the location of the fuse block below. eurotec : Full Size Image eurotec : I believe you will need to replace the fuse b..Hi, I just arrived home. I'm looking at this now.Do any of the fuses in the rear fuse box have 12 volts?I show that terminal block near the filler neck. Do you not see it?Yes I am. It looks to be near the fuel filler neck. I show power to the rear fuse box under the seat coming from the X4/22.Let me know if you need more help with it. I'll be around. Need a fuse layout for 2001 s500 - JustAnswer Sep 23, 2009Need a fuse layout for 2001 s500 - Answered by a verified Mercedes Mechanic Assignment of Rear Fuse and Relay Box . Relay Q - U . Assignment in the Fuse and Relay Box in the Right Engine Compartment . Relay K - P . This is for the right side of the engine compartment fuse box. Edited by AMEDEE on 9/23/2009 at 9:31 PM EST.