Dear all,
I have got a Toyota Yaris hatchback that comes with standard CD player, but no steering wheel audio controls.
Now I got given an OEM steering wheel controlled Bluetooth Handsfree for the new Yaris, but I know that it requires the steering wheel audio buttons to function properly.
Does anyone know the schematic of the Toyota steering wheel audio control buttons? And where they connects to?
There are 5 buttons, Mode/vol+/vol-/Up/Down. I am hoping to build a small panel with 5 push buttons and mount it somewhere on the dash (or hidden) and hook it up just like the standard steering wheel controls.
I have found the wiring connection:
http://www.castulucci.com/projects/carpc/o...tors/index.html
There is a 20 pin plug contains 3 wires that comes from the steering wheel control buttons:
Pin 6: GND (Ground from Steering wheel audio controls) - Neither Input nor Output - Connected
Pin 7: SW1 (Seek+/-, Vol+/- Inputs from Steering wheel audio controls) - Input - Connected
Pin 8: SW2 (Mode input from Steering wheel audio controls) - Input - Connected
Now the question is... can someone with the steering wheel control buttons on their car be so kind to measure the resistance of each button when they are pressed (and when they are not pressed, in case there is a particular resistance in the steady state)?
And if you know that the 5 control commands is not as simple as "difference in resistance", could you please tell me how to make this work?
Thanks in advance! And if I am successful in building a 5 button panel to simulate the buttons on the steering wheel controls, I will write up a very detailed DIY instructions!!!