1998 Honda Civic Compressor Fails to engage

I have been troubleshooting this for a while. Had it to the dealer and got some useless feed back.
The AC system is correctly charged and serviced.
The AC compressor clutch will not engage. I have carried out all of the TS in the Honda Service Manual and the only thing I can surmise is that the ECU is not supplying a ground to the Clutch relay. The wire checks fine from the A17 connection on the ECU to the under hood relay/fuse box. There is power at the pin when connected but the relay (which is fine) does not latch. If I supply a ground (through the back probe) to A17 the relay latches and the compressor engages.
I can only assume that the ECU is not supplying the ground for some reason. I am not sure what other functions affect this ground being supplied. I do not have a schematic of the ECU to see what other inputs are required to supply the ground.

Right now I have jumpered the Relay connections to supply power to the cluch through a manual switch.

HELP