I'm afraid I am not going to be of much help to you. You obviously have either a non standard system or at least a more complicated one than ours, which consists of the WP5000 Navigation Receiver (shown in image 01) and the Drive Unit (shown in image 02). The NR is hardwired to the DU which then has a two core power lead with plug to a 12v outlet. We do not have the remote control (H5000) or the wind vane (WV3) .
In our case the internal compass has failed. Of course the parts are long since out of production so I've simply given up and ordered a new pilot from another manufacturer. I'm guessing that your compass has also failed at some time in the past and a new non Navico unit has been installed.
I fear you are on your own with this. Sorry I couldn't be of more help.