Why does my iphone car charger make audio stop working?

I have an iphone 4s and whenever I plug my car charger into it, the volume stops working entirely. I tried using the charger with other phones, and the volume still won't work. When I press the volume button, the ringer is completely blank. Nothing happens. What should I do? Is this normal when using a car charger?

Because it's connected to the cars system and it thinks its sopposed to be playing music thru your cars speakers.

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