Which radio do you have?
Do you have the RB1 with the LCD color navigation screen? Or one of the other radios with the vacuum fluorescent display?
If you have the RB1 and everything else on the radio works, it sounds like a blown backlight bulb. I have not been successful finding backlights. If it helps the RB1 is made by Alpine. Maybe Alpine can help.
If you have one with the fluorescent display and you are electronically adventurous, you can watch a video like this
http://www.youtube.com/watch?v=SfagI3HKtaM
Not for the faint of heart.
Or you could contact a business that repairs radios such as United Radio in New York. Repairs are often cost prohibitive on factory radios.
You may want to search EBay or CraigsList for a used working replacement.
One other solution is to try a radio reset by disconnecting the negative ground cable from your car battery for about 10 to 20 seconds.
Check fuses to radio.
check connector at radio.
if all that is good, radio is bad.
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.
SOURCE: I have a 2002 Jeep Grand Cherokee, 6 cyl. no reverse
if you cant rebuild then off to the tranny shop
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