I have a 2002 without the navigation sysytem. The screen just went dark on me. The radio, temperature display and air work, but, with no display on the screen. The "on" light in the VTVM button comes on when the ignition is first turned on, but, will not light if the button is pushed after the engine starts. Can anyone tell me what fuse may be involved? I thought I would try the simple things first. My local dealer is telling me it could me a $1,500.00 repair. Any help would be appreciated.