Signal Generators

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How to generate a simple video input signal

I need an input to the, "Video In" jack on the factory-installed dvd player in my 2004 Chevrolet Venture mini van that will result in switching from playing disks to the auxiliary audio inputs.
I want to play my mp3 player thru the auxiliary audio inputs of the dvd player. If I connect the, "Line Out" from my mp3 player to the audio phono input jacks on the dvd player and play the mp3 player, no sound sound is heard. If I connect one end of a cable to the video phono input of the dvd player with the other end open, there is still no sound. If I connect the video out from my camcorder to the the video in on the dvd player, there is still no sound. If I now turn my camcorder on, there is still no sound. If I now press, "Play" on my camcorder, the sound plays just fine thru the vehicle's speakers.
I have tried fm transmitters/modulators and find them unsatisfactory.
I have requested help from GM without success.
I have requested help from Panasonic, whom I am told is the supplier, without success.
Most new vehicles now have no cassette player so the cassette adapter is of no use.
I would like a substitute source for my camcorder in order to play my mp3 player thru the vehicle's speakers.
I would very much appreciate help with this.
Thanks.
Don
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