Headunit install question.

[Theory2]

Can someone help me out. I am installing an eclipse headunit into my 06 4runner non jbl. Cannot figure out how to splice into steering controls. I have two brown wires from the head and near as I can figure three wires from the vehicle: yellow-blk, white-red, and violet white. Thanks for any input.

 

[mikeyv]

A 2005 wiring diagram says:

W-R is GND
V-W is SW1
Y-B is SW2

 

[Theory2]

Thanks for the reply mikeyv.