help with alarm
 

i need some help with my alarm system
i bought a 2005 g35 sedan and its only came with small key and not the other part it goes attached to
i looked online and it said you can program a keyless entry remote, you had to put the key in and out of the ignition like till the hazard light blink to enter the alarm mode.
but my cars lights wont blink at all ive tried that like 10 times and it doesnt work
also the outside buttons on the doors and trunk buttons wont work
the car has salvage title because it was rear ended
i want to know if maybe there is something that the previous owners disabled or something
thanks