The red circle white plug (6 Pins) for add extra video in for the gps nav screen display. It has different shape. You could try to get 6 pin male plug for your female plug which you showed in your previous post for feed video in. It is easy to remove the white plug and if you not find the male plug You may solder the wiring. It is up to you.
Read more: http://www.clublexus.com/forums/rx-1st-gen-1999-2003/706952-2001-rx-300-no-nav-cpu-video-input-nav-buttons-and-wiring-in-place-3.html#ixzz3tbPDIeFV