Unit located by LH foot kick panel . Controls intelligent key, smart key. Required to start car and must have key reprogramming done when installed. Please match the letter on sticker it will be either "Q" "A" "W" "5" or another letter. Please send a note with it to make sure you have no issues when installing .If you need help please let me know. If you have any questions or need a different part from these cars please call or text 3474584697