Hello Sr, Mike.
Check the steering and drive control , your problem probably is in control.
Be careful when trying to open the control in its inside there is a very fragile flip , which usually spoils when trying to open , then open the lid of the ground control box, locate the steering control , find the control connector on the board alc500 conector J1 , check the voltage field , wires brown and orange and return blue and white function returning to the variation for the card that allows communication. check the voltage input and output , if power voltage and not have to replace the output control , if not have test power voltage alc500