For TSL, the console is "Invisible". The actions are the same, by pressing the "~" key (no quotes), unfortunately, you're just not able to see what you're typing...
Type blindly but slowly, and the cheats should still work for you...
Another alternative, and more highly reliable, is to use tk102's KSE (Kotor Savegame Editor)...
get it here:
http://www.starwarsknights.com/tools.php