Cruise control just quit working

If the switch is replaced,then it can be wiring issue or faulty cruise control board.But as the switch is replaced,get the voltage at the switch tested to confirm the switch is actually receiving voltage.If no voltage received at switch power supply wire then ,apply external 12 volt power to the cruise control switch wire and then see if cruise control comes ON.If yes,then you know wiring is issue.
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On this case, to troubleshoot this problem, there are solved help links. Click the link directly and refer the details to solve this problem yourself, with help of diagrams: ------

Ford ranger cruise control not working? http://technoanswers.blogspot.in/2012/02/ford-ranger-cruise-control-not-working.html

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Horn and Cruise control quit working?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working.html

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Horn and cruise control not working on Plymouth Grand Voyager?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-not-working-on.html

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Horn and Cruise control quit working on 2003 Jaguar S-Type?

http://howtobyme.blogspot.com/2011/11/horn-and-cruise-control-quit-working-on.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500

http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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Cruise control stop working on 1994 Ford ranger?

http://technoanswers.blogspot.in/2012/02/cruise-control-stop-working-on-1994.html

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Cruise control not working?

http://schematicsdiagram.blogspot.com/2011/12/cruise-control-not-working.html

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1996 Ford Explorer: Cruise Control Wiring Diagram?

http://schematicsdiagram.blogspot.in/2012/06/1996-ford-explorer-cruise-control.html

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These will help.

Thanks.

problem ground for the dash units

HI, your cruise control is both electrical and vacuum operated. The fuse you find in the under hood fuse box, it will be a 20amp yellow fuse in position 23. A diagram of the fuse box should be under the lid covering it. the other thing to check is if your getting vacuum to the control servo this is located on the passenger side inner fender well. gently disconnect the vacuum line and with the motor running check to see if you can feel vacuum at the line. Hope this helps. good luck

If you don't see a fuse in the power distribution box in the engine compartment then likely the system is powered by the computer which has it's own fuses. Common problem with many is the "clock spring" mechanism inside the steering wheel assembly. There are specific instructions and precautions that need to be followed when working in there or you can end up with the airbag going off in your face (unpleasant to say the least). Though I'm all for people doing their own work, (or, I wouldn't be here) I recommend that you have a competent repair shop or dealer service this.

Do the brake lights work now, as they should? The brake light switch generally triggers the cruise control to snooze.

Ok, the '03 Jeep Grand Cherokee uses a small vacuum line to control the servos. Since your light comes on, it's obviously getting power. 9 out of 10 times it's the vacuum hose.
Pop the hood and look on the passenger side towards the back for the engine coolant reservoir. It's most likely underneath it so you may have to remove the res. Check the vacuum hose and all vac. connections then check the electrical connections. If that's not the problem, check the cruise control connection to the throttle linkage.
If that still doesn't do it, you may need use scan tools and diagnostic procedures that are out of the scope of home mechanics.
Wish ya luck!

Look on the drivers side of the intake manifold to see if the vacuum line fell off. It will be a 90 degree elbow coming down from the firewall area.

Review this information about Jeep-WJ-Cherokee-Service-Manual-PDF-08W-Diagrama-de-Cableado (Wiring Diagrams / Section 8W Page 181 (8W 33-1)

Is in spanish, but the graphics can help you.

Good luck!!!

insufficient info. The cruise control has a cable that runs from the servo, located just in front of the battery, to just behind the air intake, to the throttle body. (This is on the 4.7L V8 engine.) Check for that cable being connected at the throttle body. That connect is adjacent to the accelerator cable.

could it be a fuse?