Reviving an old thread instead of creating a new one. We bought new garage door/openers and found the Cars2U module did not work. Bought a replacement from Ebay and installed. Created video below as I did. Really easy. Video is on our youtube channel - https://www.youtube.com/watch?v=WC4KEkxC6zQ
Also did this last weekend. Other ghan occasionally needing 3 hands, it's simple to do and much neater than a clip on. Worth every penny of the ebay part and 30 mins of my time.