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ABS not functioning, indicators-OK

I've just had all the sensor caps replaced (3 found cracked). Before
replacing, the "ABS OFF" indicator would illuminate within 1 mile of starting
off. Following replacement this indicator stays off, but the ABS is not
functioning as follows...

1) "ABS off" light illuminates when ignition power is initially turned on,
then shuts off when engine starts, and stays off while driving--as normal.

2) If, while driving, I push the ABS switch, the "ABS off" light illuminates.
Push the ABS switch again, and the "ABS off" light shuts off--as normal.

3) I've done a number of intentional braking tests on ice/slush and have
found the wheels lock up (definitely no ABS action) identically when the "ABS
off" light is intentionally illuminated (with the switch) and off.

4) When I lock the diffs., they engage and the "ABS off" light
illuminates--as normal.

I've checked the fuse in the ABS controller (left knee relay panel)-OK

Anyone have any ideas on what to check next?

  ([____]=====OOOO=====[____])   87 5kcsTQ, 197k miles
 []]]]]]]][Mike Aiello][[[[[[[]     original owner
       Dutchess County, NY