Im stumped as well. I have been sitting here reading the schematic and it doesn't really seem to be wired into anything else. It could be the servo or relay since it isn't working.
There is a vacuum line that runs the servo motor which is how it maintains vehicle speed. Check the vacuum lines. I would think that if it were disconnected it would affect the idle. Also from what I have read it is saying there is a fuses and relay. I don't have cruise so I have no idea where these are located.
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