1998 gmc 6.5 diesel

I have a 1998 GMC 1500 with a 6.5 diesel and it currently has a 290i command start installed in it that I can't get to get to work. I bought the truck with it in and it wasn't working when I bought the truck and I would like to see if I can get it working. So if anyone has any experience with these I would appreciate some advise on this system and how it work or any trouble shooting tips would be great.

Thanks

It does nothing when the remote buttons are pressed. on light come on no clicking sounds or  anything. When you press button 2 on the remote the remote beeps but nothing else happens on the truck. I was checking the hood pin for corrosion and it sounded like the seat belt buzzer was buzzing but I could tell for sure because when I tried to get from the front of the truck to the cab it would quit (i was by myself) I found the brain box under the dash and connection are all good there but I don't see any fuses. The valet switch is also in the on position and there is another box with some dip switches I assume these are for setting and controlling the features of the remote starter. I replaced the battery in the key fob and I only have one fob for it. I also don't know if there is a sequence that the buttons need to be pressed in order to activate the glow plugs.

Thanks for the reply