I have been fighting with this for over a month now, and I have given up and decided to ask for help. I took my truck in the end of January to get the emissions and inspection done. I don't know what they did, but now the truck will not honk or flash the lights when the truck is locked/unlocked. I also rolled the window down and locked the truck with the fob, then opened the truck from the inside and the alarm did NOT go off. I'm hoping this is as simple as a blown fuse, although I have not been able to locate it, but I fear it's something much more expensive. Does anyone have any input or insight into what this could possibly be? Any help at all would be greatly appreciated.

Btw, I have a 2005 Cladded Avalanche LT. Thanks in advance.

 

I have also noticed that when I shift into park, where it used to unlock my doors, it now doesn't.