03 CGL 4.7 Cruise Control Not Working - The Lights On But Nobody Home - JeepForum.com
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Unread 03-02-2013, 05:54 PM   #1
webby88
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03 CGL 4.7 Cruise Control Not Working - The Lights On But Nobody Home

Strange development and forum search did not yield any constructive answers. So here goes:

My 03 GC Limited 4.7 my cruise control stopped working. I turn it on, the dash light comes on, I hit set and the cruise does not engage at all.

To the best of my recollection it worked quite recently (city jeep, not much need for cruise) and this weekend on a 200 mile trip it would not engage, no matter what.

I have not done any diagnostics but from what I have read my (azc) climate control has not been doing anything weird with self switching.

Any ideas what to start checking first? Mind you I am on the road so my capabilities till I get home are severely limited.

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Unread 03-02-2013, 09:12 PM   #2
jeffthe jerk
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this happened to me a few times it could be a vac line is off that's what my problem was
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Unread 03-02-2013, 09:20 PM   #3
highjenks
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Check all vacuum lines first. A faulty or disconnected vacuum reservoir will keep cruise control from working too. Cruise and defrost require vacuum pressure to work. Also be sure to check the fuse isn't blown.
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Unread 03-03-2013, 06:58 AM   #4
james_2k
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x3.

i had knocked a vac line off when changing my throttle body, it caused the cruise not to engage
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Unread 03-03-2013, 07:23 AM   #5
webby88
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:

I cant believe I didn't see it, the third hose (closest to the firewall) came off the throttle body and I have no idea how. I have not been under my hood since the last oil change over a month ago.

The hose seems a little too squishy to my taste and maybe that is why it came off. I will consider replacing it or throwing a clamp on it.

Thanks guys for pointing me in the right direction!
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Unread 03-03-2013, 08:32 AM   #6
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nice one
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Unread 03-03-2013, 09:56 AM   #7
jeffthe jerk
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yeah i put a small clamp on mine glad we could help
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Unread 06-19-2014, 06:57 AM   #8
rayliff
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Cruise control will not turn on

If you follow the vacuum lines off the intake there is also a switch block that sits on top of the left front wheel well with a green plastic cap (looks like a stem cap) make sure that's finger tight or you have a vacuum leak and cruise will not turn on.
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Unread 06-19-2014, 01:09 PM   #9
rdkendrick
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Quote:
Originally Posted by rayliff View Post
If you follow the vacuum lines off the intake there is also a switch block that sits on top of the left front wheel well with a green plastic cap (looks like a stem cap) make sure that's finger tight or you have a vacuum leak and cruise will not turn on.
If you are talking about the vacuum reservoir, it sits behind the passenger headlight, which would be the right side.

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Unread 06-26-2014, 09:03 PM   #10
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Quote:
Originally Posted by rdkendrick View Post
If you are talking about the vacuum reservoir, it sits behind the passenger headlight, which would be the right side.

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2 different units. Both of mine are good, but still no cruise.
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Unread 06-27-2014, 05:31 PM   #11
rdkendrick
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Originally Posted by akoutdoors1 View Post
2 different units. Both of mine are good, but still no cruise.
Then my apologies to RAYLIFF. I didn't know about the other unit.

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Unread 06-27-2014, 07:08 PM   #12
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Brake light switch misadjusted? Push brake pedal down with one hand, pull plunger out with other. It will move about 3/4 inch. Let pedal go and it will self adjust. Worth a try. Worked on mine.
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Unread 08-30-2014, 03:51 PM   #13
Skyfox16
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Is there a cable that runs from the servo to the throttle body? I have two cables, probably the throttle cable and another one that attach to the throttle body and the one cable is really loose. Would this cause the cruise not to work?
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Unread 08-30-2014, 04:12 PM   #14
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Quote:
Originally Posted by Skyfox16
Is there a cable that runs from the servo to the throttle body? I have two cables, probably the throttle cable and another one that attach to the throttle body and the one cable is really loose. Would this cause the cruise not to work?
The other cable goes to the cruise unit, under your headlight, its Controller by vacum, any vacum leak will F it up, most common
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Unread 08-30-2014, 08:09 PM   #15
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Quote:
Originally Posted by akoutdoors1 View Post
2 different units. Both of mine are good, but still no cruise.
I did not check before, but for kicks, I decided to check what it says about Speed Control, in my FSM. It says NOTHING about any other vacuum canister. It only mentions the vacuum reservoir, under the passenger headlight.

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