[Faisal_khan]

Try this:

pawn Code:

public OnPlayerExitVehicle(playerid, vehicleid)
{
    if(Player[playerid][Seatbelt] = 1)
    {
        playerseat = GetPlayerVehicleSeat(playerid);
        PutPlayerInVehicle(playerid, playercar, playerseat);
        SendClientMessage(playerid, NICESKY, "Unbuckle first!);
    }
    return 1;
}