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There are numerous things that can cause this. A fuse, a vacuum leak, a bad switch in the steering column. The switch in the steering column is usually the culprit but is also the hardest and most expensive to change. Best way to find out is have a mechanic plug it into a computer and see if it reveals any trouble codes. Good Luck Try the horn. I had a '93 Grand Marquis and the horn and cruise control were on the same fuse. The horn would frequently cause the fuse to blow and then, no horn and no cruise control.
Also of the many things that can go wrong outside of replacing the servo controller. 1) check the servo deactivation switch. Located on the brake pedal arm under he dash. This will require you to remove the black plastic duct fot shield to expose the under dash area. It only has 4 plastic speed grommets. You will see to switches on this brake arm. The lower one activates the brake lights. The upper one deactivates the cruise control and is a common failure in 1998-2002 Ford Mercury Crown Vics and Marquis. Remove the connector(also known as connector c223), and check the continuity of the switch opened or closed. It should change from infinite to a short using a standard voltage meter set to ohms or continuity and pushing the brake pedal. Also Fuse number 1 (15amp blue fuse) located there under the dash as well, is the primary fuse for the cruise control servo. In most cases you will see this ok. There are several other checks on the servo controler itself, but you will need to locate the troubleshooting guide on the net. There are several places to find the cruise control troubleshooting guide. Just Google it. Comes complete with wiring diagram, and step by step testing with a volt meter. Here is a reference place that has details about repairing the cruise control and wiring diagrams I used on my 1999 Marquis to fix the cruise control not working. http://www.p71interceptor.com/cruise/
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