Check the by pass relay. It is located on the bottom rack closest to the center console. The relay rack is located on the passenger side of the console behind the panel going from the center console to the firewall. The panel underneath the glove going to the center console has to be taken off first. All three circuits work through the relay. Check the ground connections at the relay rack. This is the only item that I can find that connects all three based on the electrical diagrams I have for the 92 960.