Are you saying that after you charged the battery and cleaned the terminals, that it will not turn over? Do you here any clicking noise when you try to start it, or is it just dead? Do you have a full 12 volts + at the battery and how far down does the voltage drop when you try to start it? We need more information and troubleshooting to help you through this!
Here is a good link on the VATS to help you understand how it works;
http://www.motorage.com/motorage/dat...09/article.pdf
VATS & PASSKEY 11 systems