Nav unit video player

I've just aquired a 2002 A6. Although I live in New Zealand this car was imported from Japan. It has a factory Nav unit with CD Stacker, a TV and minidisk player built in. The TV won't pick up any channels here I presume they are on a different frequency. One of the channels on the TV has VTR on it with a picture of a video tape on the display. I presume this is for an externally connected video player, but I can't see any obvious place to connect a player. Does anyone know if there is a connector on the back or somewhere else? I can't get the nav unit to work because there are no disks for New Zealand, but it would be nice to get the unit to work as a TV or video player. I know this is a long shot because most of the stuff on here is for US based Audis but it's always worth a try.