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There are some wires that run right above the driver's head on top of the headliner. I do know the Ontar Mic wiring is noted to come loose and rattle around.
If the dealer is a long way off, or if you are like me, you hate going in for service, you can remove the A-pillar molding (one screw to remove, then pull the molding back and out), and slightly lower the headliner (don't bend it), you can apply some tape to the Mic wiring harness and this stops the rattle.