This is a nice little Isuzu tech video I have about TOD from 1998. I believe everything is the same for our VX except we have no TOD switch. Ours is on all the time. The method shown for reading and erasing TOD codes is the same as in the VX manual. The quality is not the best, but it's very watchable.

11:39 and 13.9 mb, WMV file only-
http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/tod.wmv

Mark