Hello
In my experience it sounds like the vic unit has been spiked. I am an engineer for a company called alliance electronics and we spealise in repairing parts from the commercial sectors, I.e truck, coach and bus.
This is a common problem with the vic blowing fuses along with outputs been stuck on
If the unit was to be repaired you would have no problem with coding the unit back into the vehicle as it is the original unit that is collected from yourself, repaired and then returned in a turnaround time of three days from collection.
Please feel free to contact our sales office who will be happy to help and you can always talk to an engineer if you need to. Were based near Sheffield, telephone number 0114 2477041
Steven Coupe
June 2012