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.
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Test and make sure brack switch and lights are ok.
make sure throttle position sensor and speedometer is ok.
check electricat connector and vacuum lines are good and connected at cruise servo.
make sure fuse is good.
check clutch switch.
if all above good replace servo.
If this is a 4.0, there is a vaccum line coming from the bulkhead connector, can follow the windsheild wiper lines to the driver's side, and if not connected should see it hanging. Connect it to the intake manifold.There is a small tube sticking out of the manifold, connect line to it. If that does not work, check your high mount stop light, if that is burned out will do what you described, light on, on dash but no engagement. I had the same problem, only BOTH happened a week apart to me. Hope this helps. I beleive is the same for v-8 engine.
could be one of two hoses it is either a vent for the front axle which it gets tied up to frame,or it is the vaccum line to the front axle for 4wd to engage front wheels and it runs up to the back side of cruise control and vaccum canister
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!