Your cruise control system has a self diagnostic system. With key off depress and hold off button and turn ignition to the run position, the speed control indicator will flash once which tells you that it has started diag mode- five more additional flashes indicate a defective cruise control servo. release off button and press cruise buttons in this order on/resume light will flash once, a flashwith the set button indicates the static test has passed if no flash with the set/accel and no additional flashes indicates a defective switch. if no flash & additional flashes occur we would have to go to other tests.
Perform this self test and let me know what happens and if need be we will get into componet tests and wiring charts. thank you, Jim