Ok so I read the information from this mp3car.com thread about steering wheel systems.
http://www.mp3car.com/fb-documentation-and-tutorials/117074-tutorial-steering-wheel-controls.html
It basically said my cars steering wheel system is resistor type and that it needs to be put into voltage divider configuration. So I read up on steering wheel controls and voltage dividers and such, but it made me even more confused. I understand how voltage dividers work, but I don't know what I need to do to put my car into a voltage divider configuration.
Is resistor based steering wheel systems the same as voltage detection-type steering remote control? I have been messing around with my car every day this past weekend, including yesterday. This is what I was able to figure out so far.
SWC > SWI > Car Radio
SWC: Not connected to anything (Constant 0v)
vol. up = .698 (2k) / .004v
up = 175.7 (200) / .004v
mode = .032 (2k) / .004v
down = 175.4 (200) / .004v
vol. down = .694 (k) / .004v
SWC to SWI-ECL2: Coming out of the SWI-ECL2 (Constant 0v)
vol. up = 1.023 (2k) @white wire of
up = .005 (2k) @ white wire
mode = .005 (2k) @ brown wire
down = .293 (2k) @ white wire
vol. down = 3.31 (20k) @ white wire
SWC to SWI-ECL2 to Car Radio: (Constant 3.22v)
vol. up = 1.34v @ brown wire of car radio
up = 0.001v @ brown wire of car radio
mode = 0.001v @ white wire of car radio
down = 0.56v @ brown wire of car radio
vol. down = 2.18v @ brown wire of car radio
Note: I had to connect a 150 ohm resistor to the down and vol. down wire. I also had to connect a 47 ohm resistor to the vol. up, up and mode wire. The free ends of resistors are connected to the singe white wire.