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Wagonman - if I end up ditching it, the dash control is yours.
Gregte - thanks for the encouragement. I just got off the phone with tech support and they had me do a couple of things (I'm posting this just in case someone else finds this via Google):
1) ensure the unit's LED is blinking with it switched on and the engine running (if you're using the ignition method for input (vs. VSS or magnet kit).
That checked out OK.
2) disconnect and ground the purple wire from the brake switch to ensure it's not the culprit (the LED on the cruise control unit will light when the ground circuit is open)
That checked out OK.
3) ensure the engine is producing enough vacuum (14-20 inches of mercury required for the unit to function). My ScanGauge MAP values showed the car is producing enough vacuum under load. (1 inch of mercury = 0.49109778 pounds per square inch, thanks, Google)
Checked out OK.
At this point, the tech said I'd have to send the unit in. I'll open it up anyway and see what I can see. I don't have a signal generator to do any testing (hmmm, I do have the car...), but I'll at least visually inspect it.
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