Since your truck is an Express you do not have the factory alarm. Your truck is immobilized when you lock it with the key fob but no alarm will sound if anybody opens the door or breaks in. I got in my truck and locked it with the Fob. I waited for everything to shut down and pushed the Homelink and it worked. I then opened the door to simulate someone breaking in and the Homelink still worked. I also noticed that most of the time when I pushed the buttins the EVIC wole up and said transmitting. I have never heard of the Homelink being controlled by the alarm so I think the information you got was inaccurate. My truck originally came with the RA2 radio with the overhead console so my Homelink was a plug-in play. The CV2 code is already present in RA2 equipped trucks. The truck that we added the overhead console to that originally had the RA1 with no overhead has been traded for a 2500 so I don't have it for reference anymore. On that truck we got a harness from a truck that had a leaking 3rd brake light and needed a new headliner. We basically cut the hole for the overhead and mounted it and plugged in the harness took it to the dealer and added the code and it worked perfectly. I honestly think the Homelink would have worked before we even added the code it just would have not shown up in the EVIC. The buttons on the Homelink are not supposed to illuminate when you push them (at least mine don't). The only time the buttons on my Homelink illuminate is when my dash lights are on or I lock and unlock the truck and the lights flash. I have not heard of any differences in the wiring between the 13 and up trucks they are all pretty much Universal. Unfortunately I do not have the schematic for the Homelink but I believe the three wires going to it are Red, Black and another one that is primarily Orange. If you can get ahold of schematic I would double check your wiring to make sure it's correct if everything seems to be okay I honestly would try another Homelink module if I were you.