The issue is most likely a bad switch, or the cruise control unit. But 1st, check Fuse #B7 to be sure.
If the fuse checks out, then you're going to need a DMM and a wiring diagram to make the necessary checks to narrow the issue down to either the switch or control module. You will also need to pull the steering wheel in order to remove the column switch and access the electrical connector.
If you're comfortable doing that kind of work and have the necessary tools, IM me and I can send you the wiring diagrams, etc.
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