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A week ago I could receive calls but the caller couldn't hear me. I also notice my navigation system did not work. Voice commands were not recognized. 

I replaced the roof top fin antenna and the microphone thinking there was a water leak that caused the problem. Voice communication, GPS and Onstar is still not working. 

Is there a fuse in the interior panel i can check to see if power source is causing it? I want to check the fuse before spending money on a new communication module

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