Cruise light on but not set - JeepForum.com
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post #1 of 16 Old 04-09-2020, 01:05 AM Thread Starter
delmanciomio
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1997 ZJ 
 
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Cruise light on but not set

When i hit on/off button cruise light on, but when i press set button and leave my foot on gas pedal speed is descreasing and this means speed not set. Where can i check it, i dont know car very well.

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post #2 of 16 Old 04-09-2020, 03:45 AM
Zilliver
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How fast are you driving? I dont remember the minimum is, but around 55-60 km/h

98 Grand Cherokee 5.9 - daily
95 Grand Cherokee 5.2 - offroad
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post #3 of 16 Old 04-09-2020, 06:03 AM
At1bob
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Cruise light Means on not Set

On my 97 the left switch on the steering wheel top is On/off and the bottom of that switch is set. You turn the system on with the top of it and get the light then hit the bottom to Set the speed. Its above 35mph (I think). Mine did not work at 1st I had to take the switch apart and clean it. It was pretty simple to do I had to remove the Horn/airbag assay then I could easily remove the switch. The airbag removal was pretty easy just a couple of screws and a electrical connector. I think I just loosened it and set it aside but its been awhile I'm not sure.
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post #4 of 16 Old 04-09-2020, 09:16 AM
1996maroonzjf
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The other things to look for are vacuum leaks, speed control fuse, and the brake switch. The brake switch can be adjusted per the FSM. I took out the brake switch and did the adjustment earlier this year after having the same problem and it worked.

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #5 of 16 Old 04-09-2020, 03:38 PM
RedRiverT
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In the engine compartment, on the right side, about half way along the fender, there is a hard plastic tube that is part of the vacuum system for the cruise control. It loops up and is exposed there. That tube is very easy to break when someone is working under the hood.
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post #6 of 16 Old 04-09-2020, 09:57 PM
8v-of-fury
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In for answers.

The cruise on my 98 4.0 is intermittent. It will always turn cruise on and off, but more times than not, it wont set.

One time it didnt work for 2 years, and one day I tried it, it worked. Then didnt ever again lol.

I'll have to look at the switches in the wheel, thanks

'98 ZJ 4.0/242, Locked d30/d35, 31x10.5x15, 2" BB w/ Bilstein 5100's
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post #7 of 16 Old 04-09-2020, 10:05 PM
1996maroonzjf
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Quote:
Originally Posted by 8v-of-fury View Post
In for answers.

The cruise on my 98 4.0 is intermittent. It will always turn cruise on and off, but more times than not, it wont set.

One time it didnt work for 2 years, and one day I tried it, it worked. Then didnt ever again lol.

I'll have to look at the switches in the wheel, thanks
That sounds like the brake switch to me. Mine would work when I first started driving, but once I stepped on the brake with the cruise on it would never come back on until I shut it off and started it again. Like if I stopped for gas on a road trip it would work again until I stepped on the brake.

The FSM procedure is pretty simple to adjust it. New Mopar switches are also like $30.

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #8 of 16 Old 04-10-2020, 11:15 PM Thread Starter
delmanciomio
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I checked all vacuum lines and one connectted to engine block, T shaped hose and its blinded with plastic thing and one goes underbattery. Do you guys have any diagram about it, maybes under battery hose disconnected. I dont think its fuse problem because when i hit on-off button cruise light comea on
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post #9 of 16 Old 04-11-2020, 10:08 AM
RedRiverT
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On the bottom of the battery shelf, there is a chamber that is part same plastic. It is the vacuum reservoir. The hose simply goes under and connects to it.
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post #10 of 16 Old 04-13-2020, 11:24 AM Thread Starter
delmanciomio
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How can i check all vacuum hoses are correct and proper ? If this is electrical problem CRUISE light will come on again ? I have light on dash and fuse check necessary?
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post #11 of 16 Old 04-13-2020, 11:43 AM
1996maroonzjf
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Quote:
Originally Posted by delmanciomio View Post
How can i check all vacuum hoses are correct and proper ? If this is electrical problem CRUISE light will come on again ? I have light on dash and fuse check necessary?
What year ZJ and what engine? Fill out your profile so we can help you more.


Short answer is yes. Even if the cruise light is illuminated the fuse could be blown.

It sounds like you desperately need a Factory Service Manual (FSM) for your year. They can be found at jeeps limited dot com in PDF format for free. The FSM is just as important as a socket set or multi-meter for maintaining a ZJ.

Here are the diagnosis charts from the 1996 FSM for cruise control troubleshooting.
Attached Images
   

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #12 of 16 Old 04-14-2020, 06:49 AM Thread Starter
delmanciomio
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Hi,

Thank you for warning, I updated info
I have 1997, 5.2 V8

Which fuse controls cruise control ?
I just bought my first jeep and i dont know car well.
Any photo or direct location would be better for fuse
I want to solve this problem.

I typed jeep limited dot com to search bar and directed me chinese gambling site.
PM me if possible
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post #13 of 16 Old 04-14-2020, 08:34 AM
1996maroonzjf
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https://jeepslimited.com/

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #14 of 16 Old 04-14-2020, 02:30 PM Thread Starter
delmanciomio
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Quote:
Originally Posted by 1996maroonzjf View Post
Do you know fuse location please?
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post #15 of 16 Old 04-21-2020, 05:05 PM
phacemeltar
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hi, i think i have a similar problem. i’m planning to clean inside the steering wheel, but pressing on the buttons repeatedly loosened them up for me. now i’m almost convinced that my problem is the vacuum leak issue. a big way to tell is when you are accelerating, the a/c switches to defrost. took me a while to realize what was going on but i’m pretty confident. now i’m trying to find a guide with pictures for fixing this leak but haven’t found anything yet.
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