96 Blazer ABS problem?

I recently bought a 1996 Chevy Blazer which has an ABS light on. We were told to try the ABS module, a used module, but it did not work. The module is unplugged, if plugged in, the brake pedal pulses and goes to the floor. Since both the original and the replaced ABS module do the same thing, is there something else we should try?

You need to find a ABS capable scanner and check it out and get codes.
Post back any codes.
MT