I had a friend that bought the software for 30.00, the cable was like another 25.00. We changed a lot of stuff on my truck with his laptop while sitting at the bar eating BBQ.Wow, I had no idea that the alarm was already in the truck. When I bought mine last month, the dealer offered a $600 remote start package and an extra $100 for the alarm. Glad I didn't take it. Will print the instructions and see if they will enable it.
Look into it, may be worth your time and effort.