Cruise Control Not Responding

1999 Grand Am SE with 3.4 L V6 engine and factory-installed cruise control. When I turn on the switch on the steering wheel, the light built into it still comes on, so that's getting power. When I get my speed over 30mph and press the set button, nothing happens, though. The cruise control doesn't kick in, and the "Cruise" light on the dash doesn't come on. I've checked all of the relevant fuses as well as the connection to the cruise control module under the hood and everything looks fine. Any ideas about where to look next?