Cruise Control Help - JeepForum.com
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  • 2 Post By WJ60
  • 1 Post By AVR2
 
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post #1 of 10 Old 12-01-2019, 05:15 PM Thread Starter
GeoffPeterson
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2003 WJ 
 
Join Date: Apr 2015
Location: Rural NW Nevada
Posts: 127
Cruise Control Help

My new to me 2004 WJ Limited 4.7 cruise doesn't work. I swear it worked when I test drove it!

When I press the on/off button on the steering wheel, the green "Cruise" lights up on the dash but no matter how hard or how many times I push "set", it won't engage.

I checked the owners manual to see which fuse it uses but it is not listed. Is there a separate fuse for the cruise control? Any other diagnostic tips?

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post #2 of 10 Old 12-01-2019, 05:52 PM
WJ60
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Perhaps this will point you in the right direction.


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post #3 of 10 Old 12-01-2019, 06:09 PM
AVR2
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There's no fuse for the cruise control.

There are multiple possible causes for your issue - the steering wheel buttons, the brake lamp switch, the PCM, a broken wire, the cruise control servo or a vacuum problem.

The two most common are vacuum problems and the brake lamp switch, but I *think* that if it's the switch, then the CRUISE light won't actually come on in the first place (the brake lamp switch can fail in a way that means the brake lamps work normally, but the PCM thinks the brake pedal is constantly depressed so it never allows the cruise to engage).

Check your PMs to see something to your advantage
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post #4 of 10 Old 12-01-2019, 06:47 PM Thread Starter
GeoffPeterson
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That gives me something to go on. I'll check it out and see. Hopefully just a vacuum line. Thanks guys!
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post #5 of 10 Old 04-16-2020, 04:26 PM
Brendonwj
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Iím a proud new owner of a 02 wj limited. Been fixing big issues like the water pump, starter and blown brake line(the long one to the rear). Now thatís done and I can safely drive it, Iím wanting cruise control!
Iíve searched this and other sites. I donít think itís the vacuum lines-side note, I kinda hate the guy that designed the breather/pcv system on the 4.7.
Iím not sure about the brake light switch adjustment Iíve seen suggested. Looks like a cheap part to replace, but is it really my issue? I snapped a few pictures of the actuator
, any advice would be appreciated.



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post #6 of 10 Old 04-18-2020, 08:26 AM
jtpeters
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Here's the story on my O4 WJ 4.7 H.O. from about 4 years ago.
Just for your reference.

First time after starting vehicle.
Set Cruise Control 'On-Off' button on steering wheel to 'On'.
Press 'Set' button on steering wheel.
Cruise control engages.
Hit brakes...
Cruise control disengages.
Press 'Res-Accel' Button on steering wheel.
Nothing happens.
Cruise control "now" will not reengage no matter what sequence you attempt until the car is turned off / turned on.

Fix: Replaced Brake Light Switch and Cruise Control operated normally.

2004 Jeep Overland WJ 4.7 H.O. (Bought new in Oct 2003)
2014 Jeep Overland WK2 5.7 Hemi (Bought used in 2016 w/7k miles)
1970 Ford Mustang Boss 302 (in Family since 1974)
2013 Ford Mustang Boss 302
2011 BMW 328i
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post #7 of 10 Old 06-25-2020, 06:52 AM
Brendonwj
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I replaced the brake light switch and now cruise control works, thanks!
Only tool required was me. Turn the switch, unplug it and replace


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post #8 of 10 Old 06-25-2020, 06:34 PM
MojaveMike45
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Location: Los Angeles
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Light cigar, blow smoke in vac line, cut the line where you see the inferno leaking out, sleeve or barb it, done, finish cigar.
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post #9 of 10 Old 08-01-2020, 10:57 PM
livebait
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2000 WJ 
 
Join Date: Mar 2015
Location: HUNTSVILLE
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Change the brake switch thats at the top of the brake pedal arm. Yes I know it doesnt seem likely to be the culprit. Yes I thought the same thing and got frustrated at the CC working on and off all the damn time. Replaced the switch. No more problems. Just do it even if it just eliminates that potential. Its cheap and easy and no tools required. Its a quarter-turn locking thing on the shaft of the switch. Cheers.
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post #10 of 10 Old 08-02-2020, 11:11 AM
cdplayer
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Location: Sacramento
Posts: 151
Wj Wj cruise control issue

Kudos to WJ60 and a video to point out a very common vacuum issue on the cruise control for the WJ.

Guys, remove your battery and the trouble some to remove battery tray. Pull your headlight out as seen in the video so you have a full view of any issues resulting from battery acid draining down on wires/vacuum lines.

I fixed my cruise problem a couple of years ago by replacing the vacuum T as seen in the video and the vacuum box just below the T.

Previous owner never cleaned the drain hole in the battery tray so the fluid had no where else to go. Battery acid had chewed through both parts. What a mess it was!
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