06 silverado remote start

After some searching and trying a few things I thought I would ask and see if anyone could help.

I have a 5900 installed.  Everything works normal except for remote start.  I know everything is wired properly because it has worked for a long time.  Problem is I left my truck in storage and they never started my truck so the battery died.  This is the second time that place did this to me.

Anyway last time I just took it to where I had it installed and they fixed it for me.  But that store isn't there anymore so Im looking for some instructions on how to get it working.  It learns the tach fine but still just cranks for about a second then retries for about 10.  Last time the guy did something with the brain.  He said all I had to do was reset it for my truck but I can't find that chart anywhere.

What he means about reset is the red push button under the dash thats hooked up  to the alarm. You have to push and hold till you here a  beep sound then you press and hold to activade the alarm and it should work fine. try it

There is another box hooked up to the brain with a button and led.  Thats the only button i can find. When they put all this stuff in they made a rats nest under my dash.  I should have put this in myself but I got lasy.   Guess I paid for that cause it took me about an hour to undo all of it and put it all back together. 

P.S. Does the truck have to be started to do this? 

This sounds like a 457G or a 1700G bypass. I guess is this has lost it's memory and won't bypass the Passlock. Look on the other box for a part number.