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I have an aftermarket mp 5 in my car fitted with original iso connector and i have a buzzing noise from the speaker only when the engine is on.Can anybody help me?

I just bought an 7020g mp 5 player with reverse camera and when i put it in my car mercedes w163) the unit is stucked in reverse move while the car is moving and i didn't connect the camera.when the car is stopped everything works normal.Any ideas