[UltraScripter]

pawn Code:

CMD:lon(playerid, params[])
{
    SetVehicleParamsEx(vehicleid, 0, 1, 0, 0, 0, 0, 0);  //turns lights on
    return 1;
}

and

pawn Code:

CMD:loff(playerid, params[])
{
    SetVehicleParamsEx(vehicleid, 0, 0, 0, 0, 0, 0, 0);          //turns lights off
    return 1;
}

Hope It Helped Man!!!........