You can download the 2014 Fuzion brochure here:
http://www.keystonerv.com/brochure-archive
On page 9, it explains the Blizzard Package as ducted heat to the garage and passthrough, "radiant foil" insulation in the floor and roof, around the holding tanks, in the nosecap and in the slides. It does not state anything about the "holding tank heater pads". They are apparently not a part of the Blizzard Package, but are a separate option, listed on page 11 under "Options".
So, you may or may not have heater pads installed. There is a "build sheet" that is a multi sheet form which should have been included in your owner's packet. The owner's copy is usually yellow. It will list all your appliances, tires, axles, optional equipment by model and serial number. If you have holding tank heater pads, they would be listed on that form.
If you are sure you have them, there should be a switch on the "control panel" where the slide switches, holding tank monitor panel, hot water heater control is located. It is likely only one switch for all the pads, and would likely be identified as "HEAT" or "HOLDING TANKS". If you aren't sure if there are pads installed, you may not e able to locate the switch because you don't have that option.