lexus gs 2004 navigation stereo wiring

Hi every one,
I need some help if any one can help me with in two circuits.
1- i have added steering radio control device but i dont know where to connect the device with the radio harness.
One thing i know .....every thing is there orginally by the manufacturer but the diffrence between the gs300 and the gs430 is the tiptronic controls in the steering of the gs300. That's why they cancelled the radio controls and used the harness for the tiptronics.
Does any one have the wiring diagrams for the navigation or the color coding so we cna figure out how to connect the control to the navigation display.
2- i have fitted the car with folding mirrors which are not there originally does any body have schematics to a board circut where I can trigger the foldibg device but after the third lock repetition of locking the doors not from the first time.

Sorry for being long but im desperetly in need for solutions in these issues and thanks for ur patience

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Moe