No diag codes displayed. The green cruise light flashes breifly when the ing switch is turned on. Green light will not come on when you try to engage cruise control above 25mph. Cruise has worked once in the last three months. Intermittent???
Several components must be functioning for your speed control system to turn on and work. These are items such as your brake light switch, your steering column switches, and the speed control deactivation switch.
Simply, a test of your speed control system is in order to determine what has failed. It could be an easy fix.