Diodes are most definitely directional. Pay attention to how mine is inserted, and for the love of God, don't unplug the clips to make seating the diode easier! I made that mistake and needed a trip to my dealer to get my BCM reprogrammed. When testing, start the engine, shift into reverse, look at cargo button. It will light up. The engine needs to actually be running, and to test with the key fob, you have to wait for it to get dark, or cover your light sensor on your dash. And as always... Enjoy your ride! Sent from my SM-G955U using Tapatalk