Thanks all. It occurs to me I forgot to mention in the first post that my cars are both Y-bodies. I've slapped a signature on now so this won't be a problem going forward. As such Scan9495 never worked properly, since it was designed to talk to an F-body, not a Y-body. EEhack of course works perfectly.
Terminal_Crazy, since you seem to have the 'secret sauce' in your possession, and this being a hacking and reverse-engineering forum, would you mind just sharing said information? I don't mind doing manual commands or adding definitions, I had to do that back in my Subaru days when I was helping figure out communication with the Subaru SVX's various computers. But I'm relatively new to GM, so I wouldn't really know where to look or what magic search terms to use to get what I want. Any assistance you can provide would be appreciated.
EDIT: If by "definitions" you mean the ones from this very website, I did already have those, but they only contain commands to read data from the ABS/ASR computer, not to force it to actually perform tasks. The relevant definitions to my vehicles are here:
1992/1993/1994 Y-body Bosch ABS/ASR:
http://gearhead-efi.com/gearhead-efi/def/aldl/A175.DS
1995 Y-body Bosch ABS/ASR:
http://gearhead-efi.com/gearhead-efi/def/aldl/A288.DS
But yeah, if someone knows the proper commands to tell the ABS computer to actually do something like the Tech 1 does, I'm all ears.
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