I also have an Excelon Keg and I don't have VIOT. I have been doing research about why I may not have VIOT, and I have concluded that not all Excelon kegs were shipped with VIOT.
I looked at the Kenwood Excelon catalogs for 2003 and 2004, and the 2003 catalog doesn't mention that VIOT is included whit the keg, but the 2004 catalog specifically says VIOT is included.
Sadly, the Excelon keg has been dropped for 2005.
I also went to the local Kenwood dealer and talked to the manager, who runs two Excelon kegs in his cars and doesn't have VIOT, and was not aware that it was anything but a chargeable option.
So I think that Excelon kegs shipped in 2003 had no VIOT, and the 2004 shipments did.
I really want VIOT, and I would like to get it for no charge. Perhaps Kenwood support will provide activation codes for our Excelon kegs. I haven't pressed them for a code, I just called and asked why I didn't have VIOT. They told me to press the SCAN button.
I really want to know how VIOT is installed, and how the DMS hack may affect it, but I haven't found the information on phathack.com, and the answers to my other posts about VIOT are incomplete.