If you look at the board there is a blue jumper in place where it says TERMINATE, there should be one also there it says REMOVE FOR WIRELESS. If the wireless module is not installed the blue jumper (or any jumper, something thats makes the too pins connect together). You might be able to test just by moving the blue jumper from the TERMINATE to the REMOVE FOR WIRELESS, But looking at the pic's you do need a jumper on both.