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Yes, apparently a few people have had this problem. I've looked around and found a few threads on the issue, but no solutions. If anyone knows what the problem is or how to diagnose it, please let me know. I just drove 10 hours round trip to and from New Orleans with no cruise!!!

 
Rep Power: 812

are the fuses okay? sounds like some sort of reverse feedback problem that is affecting the brake/cruise switch. may try putting a blocking diode on the power wire of the switch.

 
Rep Power: 0

Which fuses control the CC? I just looked and don't see any listed 'cruise control' under the dash or under the hood? I'd imagine they're fine, since the CC works fine with the headlights off.

 
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I have a testing procedure for 96-00. Don't know what year you have. My schematic also shows fuse 14.

 
Rep Power: 812

for a 7thgen, since you posted in 7thgen forum, check number 10 and 4 fuses under the dash, and number 7 in the engine bay fuse box. also check to make sure the horn works and the tach. if the fuses are okay, it might be a bad ground.