WOLFEN- at first glance, it doesn't appear the CTIS control box itself is hardened. i haven't read the full schematics on the A3, or popped open the box, but the ctis control box seems to be wired into the power source by a single wire. if you look at the ctis control manifold under the A3 bed, it is a unit with exposed wires, which tells me, the manifold servos, and it's air regulation electronics are not hardened either.
the CTIS control box in the cab and the manifold electrical parts would require an insulated Faraday box and separate fuses from the alternator and ground to be sure they are emp hardened. the mass of the A3's metallic parts will conduct an emp, however, vehicles and their onboard components can sometimes weather emp's quite well due to their natural grounding through tires.
unless the A3's electrical systems have separate grounds and fuses which isolate them from the alternator and make them stand alone systems, in the event of a central overload, i don't see how anything on the truck is hardened....