Hello im buliding my own android stereo project from android tablet.
I pulled out OEM stereo HU and i need help with pinout.
Connector B is for speakers but i got confused with connector A (power)
The first problem was with green-red wire it supply's 12v constant and i need
12v from ignition key for charger to power android.

these 2 wires - white and blue are making me little bit confused.
one of them (not sure which one) is supplying around 4.5 - 5v
im searching for a wire that is coming from steering wheel controls to connect them to arduino and to pass it through the usb to android and control volume and such thing?
so are these blue and white wires for SWC or they are dimmer or something similar?
i need pinout for steering wheel controls to measure resistance so i can write those values into the script.

my connector is on the picture
https://postimg.cc/d7msHQt9
https://postimg.cc/d7msHQt9

edit: according to some posts
blue wire on pin 1 is CAN b (HIGH)
white wire on pin 3 is CAN a (LOW)
red-green wire on pin 7 is constant 12v power (radio have 20minutes off or auto on function)
black wire on pin 8 is ground

so basically i have wiring harness adapter i pulled out pin 7 and i will drag new wire from tap in to charger