When I plug my iphone 4s into the usb in my car, text and notifications sounds are gone.

When I plug my iphone 4s into the usb in my car, text and notifications sounds are gone.  The phone only vibrates, no sound.  The ringer works fine, and the music plays through the stereo system just fine.  When I try to turn up the volume, the ringer shows on the screen, but it will not increase in volume.  When I unplug the usb, everything works fine.  I have tried different cords and different cars, all with the same result.  This only happens in the car, when hooked up to the usb in the house or to the computer, everything works fine.  When plugged into the car, the sound disappears.  Any ideas?

See either http://support.apple.com/kb/TS1538 (windows) or http://support.apple.com/kb/TS1591 (mac).

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