Scion fuse How do I step by step replace a 120 amp main Sep 11, 2013scion fuse How do I step by step replace a 120 amp main fuse on a 2006 scion tc? - Toyota Cars & Trucks question 120 amp fuse blew in my scion xb - Fixya Jul 08, 2012120 amp fuse blew in my scion xb - xB Scion Cars & Trucks. Posted by Anonymous on Jul 08, 2012. SOURCE: I can't find the fuse box on my 2009 Scion XB. Fuse box is located in the engine compartment. Over the drivers side wheel well. just lift the large rectangular cover. Hope this helps. Posted on Mar 17, 2009.