Jeff, this is just a fwiw in that I'm not positive it applies to a Tech1 scanner.
On my snap-on scanner there are software modules that I plug into the scanner to do trouble shooting on the different vehicle systems. I have a general GM cartridge and a GM engine trouble shooting cartridge in the scanner when I do the DTC's for the motor controls. If I do my abs system, I need the general GM cartridge + the specific ABS cartridge plugged into the scanner before it will do any diagnostics.
Now if I want to just pull ABS trouble codes, I use my Gordon jumpers. However, if I want to run any of the tests I have to use the scanner with the ABS cartridge in the machine.
I am fairly sure that the Vertronix Tech 1 and Tech 1A scanners are the same as I keep looking for one on e-bay with a fairly complete cartridge library as the older software is sometimes hard to find.
Tom