How to test AV input output cords?

A few months ago, we bought a portable dvd system for our car, basically 1 dvd player that outputs audio/visual to a second screen via an AV cord. The source player still plays video and gets sound, but there is no output to the second screen. I want to test the cord for a short with my multimeter, but don't know how. It is a single line, I am guessing 3.5 mm. Same jack at both ends: from the base of the plug, there are roughly 3 equal cylinders separated by grooves, followed by a tip that is tapers out and back in. Any idea how to accomplish. I guess I could always by another AV line at radio shack. Thanks in advance.