I would start looking at electrical circuits from switch to underhood cruise box. Very easy working under dash for connectors to accidentally come unplugged. A good wiring diagram will give you colors along with connector locations for any interface connectors between the switches and main harness and through the front bulk head.
My friend will be checking a Celica soon with the cruise control not working so hope it's just a sensor. Still waiting for it to return from the installation of the new tires from 4 Wheelonline before we can take a closer look.
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