Since another user was able to install the cruise control lever to his L model (link below), the wiring and programming was already there in his car for that. So I wonder if the wiring and programming is already in the LE model for a Sport Mode button and Paddle Shifters. Any thoughts?
Adding cruise control to L model: http://www.corollaforum.com/threads/cruise-control-install-complete-2015-l.4486/
Adding cruise control to L model: http://www.corollaforum.com/threads/cruise-control-install-complete-2015-l.4486/