Strange as it may sound, my wifes SSB had a tail lite go out. I got a replacement from the dealership and replaced. Then, the cruise control worked until....... the headlights were put on. At that time, the burnt out light indicator would lite up and the cruise stopped working. If you turned off the car and didn't turn on the lights, cruise would again work. Come to find out, the dealer gve me a tail light that was only 1 filiment when I needed a double. The driving lights when turned on, would then indicate a failed light, and this caused the cruise to not function. After going to Pepboys and getting a correct tail lite, the problem was solved.

Sounds strange but that's my story and I'm stickin' to it.