1700g 1701g 1900g

hi can anyone explain to me whats the  diference between 1700g .1701g.1900g thanks

am not familiar with the 1900g but the other 2 are for different model gm vehicles, 1702 is for newer body style silverados etc, 1700 did trailblaxzer, silverado

1700G does the old GM Databus that controls the door locks, door triggers, immobilizers, windows etc. This module is used for the years 02-06 on selected GMs 1701G does the new GM Lan network that works with the new body style GM's that do the bypass for remote start and control door locks, monitors door triggers, etc. for the 07 and up 1900G is to add to the existing remote start in the newer GMs, it just make it simply to integrate the OEM remote start to the aftermarket one.