2001 chevy tahoe remote start

i installed a compustar 1wam-as  remote start/alrm on my wifes 2001 chevy tahoe and everything works but it doesnt lock or unlock the doors i have the wires hooked up to the correct wires near the bmc  i need help please

Not sure which Compustar brain you have, but the CM5x00 and CM6x00 only output a (-) door lock and unlock signal.  Your Tahoe has Type A (+) door locks.  Did you use relays to convert the Compustars' output to (+) pulses? 

Here is a link to this sites diagram for the "3 Wire Positive" door lock wiring diagram :  https://www.the12volt.com/doorlocks/page3.asp#3wp