GMC Sierra mk1 (2003 - 2004) - fuse box diagram - Auto Genius Dec 28, 2016GMC Sierra mk1 (2003 – 2004) – fuse box diagram. Posted on 28 December 2016 24 October 2018 by admin. GMC Sierra mk1 (2003 – 2004) – fuse box diagram. Year of production: 2003, 2004. Instrument Panel Fuse Block. The fuse block access door is on the driver’s side edge of the instrument panel. GMC Sierra 2500HD - 2004 Fuse Box Diagram GMC Sierra 2500HD - 2004 Fuse Box Diagram. Home; GMC; Sierra 2500HD - 2004 Fuse Box; These are some examples of symbols you may find on your vehicle: v. If a door is opened without the key or the remote. keyless entry transmitter, the alarm will go off. Your.