hard wired

 Contained within the circuitry of a computer or computer peripheral device, and not changeable by programming; -- of functions; as, error correction is hard-wired into the circuit of the disk drive, so it proceeds very rapidly.  [PJC]

 Connected by a continuous electrical wire, rather than through a switch; as, the air-conditioner was hard-wired into the wall circuit, so moving it would require an electrician.  [PJC]

 Performed by an inborn pattern of neural circuits; instinctive; not learned; as, many bird songs are hard-wired, but some are learned.  [PJC]