1996 Chevrolet Corsica ABS Control Module Location

I do not have any code numbers, I have a abs light on, I bought a top of the line Innova 3160D, that according to the abs on their web site this car was supposed to be supported, but it does not read the abs codes for this car, and I don't have access to a GM Tech 1 obviously. This is my son's car with 200k on it, we can't afford to take it to a dealer to get it scanned. I checked the front sensors, with an ohm meter, they appear to be ok, they have ac current when the wheel is turned. I had to replace the lower intake manifold and 1 front axle joint, and I thought I might have damaged a wire somehow. The abs system was working before this repair work. Thanks

I understand there could be lots of things wrong, but to me logic would dictate that if the system was working before I did the work replacing, the intake manifold gaskets and the front struts, springs, and the front wheel hubs and the rear shocks, that is highly likely I broke something. So, I want to check, the rear sensors and the continuity on the sensor wires, if that fails, then I will consider taking it to a local former GM dealer repair shop. Thanks

Thank You