Well, I know the problem I had and not the same as what you were describing, but my multi-function switch (turnsignal, headlights, dimmer) went bad. It was causing my headlights to start to flicker on and off, when that would happen I could see my radio backlighting go brighter / dimmer as the headlights turned on and off. It is very easy to replace, took me no longer than 15 mins to change. Part cost 100.00 from dealer. It's a self contained assembly. The multifunction switch sounds to be what is the culprit in your situation.
2006 Jeep Commander Limited 4.7L QD II.....[I]4in Super lift Supension lift, Defender Roof Rack, 285 70R17 ProComp Xtreme Mud Terrain II tires, JK wheels, Rear grab handles, polished throttle body, RCV performance CV Axles, 4X Guard belly guard, front guard, jeepinbyals upper control arms, borla cat back exhaust and LED off road bar 40" and dully D2's.
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