Hello, if you mean that if he dies ai, regenerate in the vehicle. Keep in mind also that type of vehicle is, which can be warthog that can destroy or not destroy. If that can not be destroyed and be so pro to make it a headshoot with the sniper and want to regenerate ai first of all have to go back to regenerate with this script good not remember if it was like this:

(ai_respawn <ai>)
(Vehicle_load_magic <nameofvehicle> <set>
(ai_actors <ai> / encounter)

something like that going, change if I'm wrong about something is that the scripts I have them on another PC

Note: if you want to regenerate the ai in a wrecked vehicle will not be able, you have to regenerate the vehicle.

(object_destroy <vehicle destroyed>)
(object_create_anew <New Vehicle>)