Welcome to the forums! WHere are u located? Your Ascent (like all outher non-sportivo corollas) will be a 1ZZE, which refers to our engine type. AS for your question, do a serach on the forum for stock toyota headunit wiring, u'll find the pin laout will have a ignition (+) line, and thats the one u need. Almost all head units today will have a wire to input this to, and this will control the ig on/off of the unit!