Ive seen this is this what your talking about?

http://www.youtube.com/watch?v=XjWX4-aL5NA

 

I mean like without having to put it in R. Like I know how to hack into the nav unit and change bluetooth sensitivity and all that but is there someway to maybe install a switch or something.
BTW I have factory Mark Levinson Nav
Thanks

 

I would like to know this as well. How are people tapping into the factory rear view camera so that they can show the rear cam at anytime they wish?

 

Your idea was very new until now , however you can find the badge front view camera for brand cars now . But Lexus still don't exist, or you can use any normal image camera for it , it will ok to use .

 

wouldnt this harm your transmission?

 

Adding a front view camera is a trend on the following days . Maybe DVR or universal camera is ok for fitting at front logo or grill .