Buick Park Avenue

I have a beauty of a 1994 park ave. Sunroof and all the toys.I have been restoring it and have run into an odd problem.
If I try engaging the cruise control as Im going down the highway, the light comes on (on the dash) and stays on for about 4-5 seconds and then goes out without engaging the cruise.
I have a 95 Park avenue I have been canabalizing for parts.
Any hints on what to swap out and where on the car they be found?
Thanks a ton for your help!
April 24, 2007.

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