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Old 09-04-2009, 04:53 PM   #1 (permalink)
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Cruise Control not working

Ok so here is a puzzle.

The cruise on my truck hasn't worked since i got it. lately thats bugged me.

IDK why it isn't engaging, but i can tell you this.

1: when you push the cruise control button you can hear the servo kicking in
2: when you let go of the button it sounds like the servo kicks out
3: holding the button in does nothing when going down the highway
4: from pulling on the cable it doesn't come loose, so i do not believe it is cut.

My tach and speedometer both work correctly.

what can you guys think it would be?
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Old 09-05-2009, 07:39 AM   #2 (permalink)
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2 things to check are the brake light switch and the vacuum hose under the drivers side battery, it rots out over time from battery acid is probably the most common cause of cruise failure. sometimes holding light up pressure on the brake pedal with your toe under the brake will tell ya if the switch is bad. There is no real adjustment for it , just go get a new one from Napa for under 15 bucks.
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Old 09-05-2009, 11:02 AM   #3 (permalink)
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if there was a vacuum leak the servo wouldn't be kicking in would it?

and after i got off work this morning i was sitting in the truck and i tried an experiment with the brake pedal.

i help the button in so that the servo kicked on, and then i pushed on the brake. doing so did the same as letting off the button, it caused the servo to kick off
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Old 09-05-2009, 11:45 AM   #4 (permalink)
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You shouldn't be hearing the actuator (servo?) if you're sitting still.
It will only activate over 35 mph.
In fact I don't think the actuator makes any noise any time.
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Old 09-05-2009, 12:25 PM   #5 (permalink)
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i can hear an audible click from the servo when i'm sitting still, key in the run position, truck not running though.

you push the on button and there is a click from the servo, you let go of the on button or press the brake and the servo makes another click like its kicking out
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Old 09-05-2009, 08:22 PM   #6 (permalink)
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ok, so i figured out the problem.

its the cruise control button itself. i tried an experiment and if i push the on button, hold it in, and push the set, the cruise control works. but the moment i let go of the on button it kicks out.

is there somewhere i can buy a new cruise control cluster or is it gonna have to be a junkyard search thing
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Old 09-06-2009, 12:05 PM   #7 (permalink)
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Take the switches out and clean them first, they are very simple.
If they need to replaced the dealer has them for about $50
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