From the switch to the connector above your left knee is as follows:

green with yellow stripe = +12V when on, no voltage when off
blue = resume
yellow = decelerate/set
green = accelerate/set

No diodes or resistors from the switch to the cruise amp connector in the diagram.

I had the cruise amp solders reflowed only to discover a plastic socket in the linkage between the cruise actuator and IP had broken off.

Sixto
87 300D