I read reviews and watched youtubes, and had the factory wiring diagrams. I still struggled, and if not for another Amazon reviewer's instructions, might still be baffled. HOWEVER, the seller states that the unit is to be installed only by a professional. They provide lots of information but don't "connect the dots." That said, it worked exactly as it should, and if you are armed with enough information, is an easy install. Doors lock and unlock, interior light comes on when I unlock, parking/tail lights blink once on lock, twice on unlock. Still have to finish horn and trunk remote but am sure they'll work.Note: most cars won't need additional relays just for lock/unlock. You will need relays for horn, trunk, and if you want the passenger doors to work on two clicks rather than always with the driver's door.