@dunnah01: I am curious what you find when you connect to the airbag ECU. This weekend I had a go at this ECU but for some reason it does not allow me to read bytes from its memory, despite the fact that it confirms successful receipt of the command (after a while it returns a message indicating I am requesting something that is not allowed). The communication back and forth does work correctly however.
As far as the engine ECU is concerned, I can connect but sometimes I receive garbage during the session. It does return error codes when asked for them, but I am reluctant to experiment more as long as the communication is not 100% stable. So my priority here is to figure out how to stabilize the communication. I briefly tried connecting to the ECU of the airconditioning / climate control, but was not successful at all. It seems this ECU is using a slightly different protocol than the other ECUs...
The main thing I wish I had is an application that allows direct entry of the commands required by the various protocols. This would allow me to fully interrogate all ECUs as currently all software I have is too restrictive. The functionality is mostly limited to reading & clearing error codes, reading memory locations and reading values from A/D converters. For the interfaces that are based on the ELM-32x range of ICs this is widely available, but to my knowledge these interfaces do not work on the early 3200GTs (the engine ECU might be the only exception, I will try this sometime soon).