4 wheel steering not working gggrrrrrrr

[davo 3254]

new owner of 93 svx...jdm, 4ws model.
pulled codes for light on in dash....... says its a blown fuse, but fuse (under hood) is fine. can move rear wheels when powered up (disconnected ) wires in boot, so not the 4ws motor. it has had a new steering rack in the past??? ecu had a couple of blown diodes but have replaced those, would love to have the 4ws going..... would handle even better if thats possable. anybody out there with a spare ecu i could try?? new zealand, dunedin, dave