Cruise control "noise" ??

[GottaDiesel]

Ok, I was working on the car late last night and I found a new noise that was NOT there before.

When I put the key in the 'on' position, I hear, what I THINK, is the cruise control unit making an odd noise (like there is a small electric motor in it that is running or something????)

Anyway... it is the black box that is connected to the throttle linkage that says "VDO" on it...

Any idea on what this noise is...?

Thanks,
Pete