You didn't mention the make and model of the multimedia system. I suggest you Google the make and model to find a manual for it. The manual should show whether the camera inputs are separate for video and sound or integrated. If separate, it would be a simple matter of unplugging the sound input. If it's integrated, it might require more delicate surgery to separate out the sound from the video.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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