What month is the car ?
Before May of 1996 used the Alpine Gen 1 secuity system, with a alarm ecu to the starter relay.
After May 1996 its ant intergrated main ecu with a transponder key. Since you're saying you lost the remote and now its re-armed i would say you've got the alpine system.
Turn the ignition lock to ON and press the disarm/valet switch ot button . It may be up under the dash or on the kick panel next to the accelerator pedal .