That mean the LCD in the radio has failed and it's likely not worth repairing. I would suggest an aftermarket radio.
SOURCE: location of cam sensor 2003 jeep grand cherokee v8
Answer
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REMOVAL - 4.7L
The Camshaft Position Sensor (CMP) on the 4.7L V–8 engine is bolted to the front/top of the right cylinder head (CMP Location—4.7L Engine).
It is easier to remove/install sensor from under vehicle.
Raise and support vehicle.
Disconnect electrical connector at CMP sensor (CMP Location—4.7L Engine).
Remove sensor mounting bolt (CMP Location—4.7L Engine).
Carefully twist sensor from cylinder head.
Check condition of sensor o-ring.
See picture for sensor location.
Testimonial: "that is just what i needed thanks"
SOURCE: 2002 Jeep Grande Cherokee overhead console has no display
try unhooking the battery to see if resetting the body computer helps. low batteries and poor connections at the battery can cause weird problems like this
SOURCE: 2005 jeep grand cherokee radio
It's in the engine compartment IOD#2. It's a black module with two fuses in it. Take that module off and replace the 20 AMP one.
SOURCE: Radio/Clock Display
I found a solution that sounds reasonable at another site: http://www.automotivehelper.com/topic177704.htm
SOURCE: my signals and flasher quit working 2002, Jeep
in your vehicles owner manual, look up fuses, and flasher units or flasher relay. Fuses are normally located under the dash, but when both turn signals quit working it is usually the relay. The relay is located under the hood yours owners manual should show you the location.
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