Headphone socket on a ceiling mount DVD player

Hi All,

My Mk2 pre FL Octavia VRs has a Rosen ceiling mount DVD player. for ages its bugged me that you have to use the headphones supplied with the car. Today i got the bits to install a headphone socket and you know what... it works.

Well, I say it works, its fine if I use the aux port on the car to get the sound working through the stereo but not if I want the sound to play on headphones, mainly because i only have the L+ and R+ leads connected. I dont know which pin the audio- is so I haven't connected that. I also suspect if I use headphones it will only have 1 volume as the volume control on the DVD player doesn't appear to do anything.

But anyway, if you want to connect a headphone socket tel me know, I have lots of leftover bits, and if you know which pin is audio- let me know Im not brave enough to do trial and error again.