Sorry for the delay in answering you questions folks!
Right first off, this is a great product, but I must stress it is NOT a plug and play device! You doo have to cut into the Lexus wiring loom and do a little soldering.
What this product does is convert a Composite video signal ( PAL or NTSC ) into the RGB+s (NTSC) that the OEM sat nav screen needs.
As well as this converter you would need a realy and a switch mounted on the dash to switch the screen between the converter and the Sat Nav.
I have hidden mine in the ashtray like this
switchRight the rough diagram for the relay etc I have as a word doc for anyone who wants it but I can't post it on here, unless anyone knows how???
As for sound, this converter does not help with that, so until a aux input for the Lexus Head unit (hint, hint steve) a tape adaptor is needed.
The Convertor will take any Composite video signal so it could be used with a camera for reversing, in which case you could use a feed off the reverse lights instead of the switch so it switches automaticly.
Sorry for my spelling on all this, I am trying to type fast cos I'm at work!!!!!
Any other questions?
Just post them here and I'll answer them asap.
Hope all this helps,
Ian.