Re: D40 174 2006 cruise control only works sometimes how to
There are several ways to check - if its a manual box tuck your foot under the clutch and lift the pedal, then try the cruise - this will check the clutch switch.
Next, pull the gear lever toward you in 4th or above, then try to engage cruise - this will check th gear lever switch.
Its usually one or the other, although occasionally the steering wheel switch contacts get gummed up and can stop working, but try the other 2 first - its easier!!