Newbie to VX... picked it up today... 87/175 ltd and it's vgc.... BUT... It would be nice to have the screen working... It has power.. the radio works ... radio 2 only... Guess i need expander??.. Ther eis a sat nav system in the boot/trunk with no CD in it.. but i dont get anything on screen and would like rear view even when not reversing... any ideas??