I just got this car delivered to me on Friday from Texas . Immediately I noticed that it has an aftermarket stereo. It's a Kenwood touchscreen DVD navigation Bluetooth not sure exactly which model. I noticed that the navi screen turns on when I start the car with the Lexus logo but that is all. Also both doors on the navigation screen and the after market stereo do not work. does anyone know how much it would cost or what needs to be done in order for the navigation screen to work along with the after market stereo? As well as the doors? or am I screwed due to the previous owners decision....

 

Not sure if you're still looking for feedback, but from what I've come to learn here on the forum, the Original Radio also serves as the master unit for the AV network, which includes the navigation ECU and amplifier ECU. You may want to check out some of the posts from Retroplay in the SC430 (2nd gen) forum. He's covered quite a bit of info on the AV network in this car.

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2007 SC430
Starfire Pearl/Ecru
Vais SLX w/XM;
NavTool 3.0-HDMI for AppleTV,
BU Camera & BlindSpot Cam.