You may have a problem with the BCM (Body Control Module) and related systems like IVMS (Integrated Vehicle Monitoring System, Remote Control, Anti-Theft, Power Window/Door Lock, etc. Check the related fuses. Refer to the link below and start with the wiring diagram, on page EL-139 onwards, and then you can go thru the BCM and IVMS, etc. Pages EL190 & 191 shows the BCM input/output.
http://www.nicoclub.com/FSM/i30/1998_I30/el.pdf