07 colorado door lock issues

Had an 07 Colorado here on Monday. Put an RS623 Astrostart with a idatalink ads-dlsl-gm4 bypass kit. Everything went good until start up. The doors unlocked, truck started and then doors relocked. Thought that was weird but sent the customer on his way and told him to keep an eye on it. He phoned last night saying that doors aren't relocking after startup. I have used this kit on an H3 Hummer without problems. I would really like the doors to stay locked. Anyone know how to fix this?

I am using the idatalink to do the door locks.  I used an Autostart when I did the Hummer. I also used this same setup yesterday on a Torrent with an Ultrastart without problems. I am thinking it's the Astro unit however that makes no sense since I did unplug the lock/ unlock relays from the r/s and nothing changed. Something is wack on this setup. I'll get the truck back on Monday and try again