How to diagnose and fix cruise control on 2000 Buick Lesabre?

Initially the cruise became difficult to turn on occasionally. Now it seldom works but on rare occasions seems to work like new. When its problematic the systems are: The on/off button (which seems to depress on and off fine) will show a light very dimly and it sometimes seems to flicker somewhat, but with multiple hits will brighten properly yet on these occasions the set button is ineffective.How to diagnose and fix cruise control on 2000 Buick Lesabre?An out of adjustment or defective brake light switch will cause the cruise control not to operate.How to diagnose and fix cruise control on 2000 Buick Lesabre?And there is a sensor on the clutch as well gives the same effect.

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