91 Civic electrical cruise does not work
 

we bought 91 LX model with cruise that does not work.
it has electrical actuator, not vacuum.
fuse is good.
there's no apparent damage to actuator; linkage to gas paddle works fine, if hand operated.
connector appears to be in good shape, i cleaned everything.
steering wheel buttons move.
"cruise on" button lightens green.

it just does not engage.

any suggestions?