AD-5 means CPU (logic card) cannot communicate over the CAN BUS wires to a travel (traction/drive) controller. AD-6 is same thing, except no communication to pump controller. Do an ohm test across the CAN high and low wires...should see 60 ohms...if you see 120 ohms you have an open. I highly suspect the problem is you are not getting voltage to the controllers to power them up...hence they cannot communicate with logic board.