Boy, this has gotten all as clear as mud. One post says ECM, another says ECU,,, then someone discribes the pin location of pin 22 as 2nd row from left, 3rd pin down from the outside of plug B but a photo shows location of pin 20 and where pin 22 would be is not as the discription given in the earlier post... also, just where is the ECM/ECU located? A photo would really help out. I've looked on the firewall since a post vaguely hinted that it was the one closest to the firewall as opposed to the radiator. I'm also guessing that since there is a plug B on the ECM/ECU that there is also a plug A? Are the plugs labeled? If someone could kindly start from the beginning, and explain to someone who's not intuitive of the locations for anything under the hood of their new truck and could provide a diagram or photo of exactly what's what, (as opposed to a diagram of what looks to be the wrong plug and wrong pin marked) A diagram orienting the location of the plug as well as the specific pin 22 location would be a great help. I already have the feature activiated. Carson Dodge charged me $40,then refunded the money to me when it wouldn't work. If I can get this done to my truck, I'll head back there and show them what I had to do to get this activated so they can help out other Dodge owners out there. (I'll give 'em back the $40 too!)