Sounds like you might have some corrosion at the contacts on the controller causing high resistance. If you are unsure where it is located, follow the cable from the throttle plate to the controller which will be black, and usually has a soft rubber cone shape on one end where the cable attaches. Pull the plug and inspect it for corrosion. You can clean the contacts with electronics spray or a mixture of baking soda and water. (1 tablespoon to 4 ounces of water). After the contacts are cleaned and free of any corrosion, rinse them thoroughly.
SOURCE: 2004 Chevy Cavalier Cruise Control Problem
here are two switches that are the usual causes of the cruise kicking
out. they are both under the dash. One is the switch for the brake
lamps (stop light switch). the other is for the clutch if you have a
manual transmission.
if you follow the brake pedal up under the dash you'll find two
switches at the top of the pedal. (it may be one switch but I think its
two). the top one would be for the cruise control. if the switch is
loose it will cause the cruise control to think you're stepping on the
brake and that will disengage the cruise control
same with the clutch pedal if you have a manual transmission; if the
switch is loose it will indicate you are pushing the clutch pedal in
and cause the cruise to kick out
other than that you'll have to check all of the connectors. If it does
engage then the fuses and actuators should be good and it would be a
loose connector or switch that's kicking it out
also, i assume your speedometer works; if its not then that's your problem as the cruise won't engage under 30 mph
SOURCE: Vehicle shuts off after hitting brakes
Press the brake pedal with the engine idling, do you hear any hissing? if so it is a leaky brake booster, the vacuum leak will cause a stall, another issue with this car is sludge in the throttle valve and idle speed control air-bypass valve, clean them both with carb spray with the engine running, use about 1/2 the can, hold the idle high or the engine will stall, then disconnect the battery for five minutes, reconnect and drive a few miles, if the stall is sludge related then this should correct the issue.
SOURCE: cruise control
i had this problem and fixed it. The switch on the brake pedal was slightly off adjustment and was detecting as though the brake was always on, disengaging the cruise control. I pulled it apart and put it back together and made sure it was working ok, now my cruise control is working ok.
SOURCE: 2004 acura Tl cruise control wont engage
This is a problem you will to take to a shop, If you are mechanically inclined I can help you, but if not I would not mess with it, it could be the button or it could be the controller and could even just be a fuse, check the fuse and if you don't find the fuse blown then let me know if you have a volt meter and what to test this yourself. You are going to be working around the air bag too and if you probe the wrong wire while testing you could break your arm or leg by deploying the air bag by accident. Or your neck.
SOURCE: Cruise Control - 1996 Buick Lesabre
Finally got mine fixed. It was a faulty Cruise Control Module..
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