2006 T250 will crank and run but won't unlock by pressing 'press to operate' button. Seat bar lights comes on when lowered but no lights at all on tilt and lift and traction/lock lights
It should be giving you a code if I had to guess. It's most likely and issue with the BICS solenoid. It is located on the control valve. It will be near the middle of the valve when you lift the cab.