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Looks really good, I didn't realize someone else was going with this idea. I can post a circuit schematic if you need any help, the OEM stuff is wired all in series, so each signal goes through all the resistors below it.
So Seek Up shorts out the pins. Seek down connects a 330 ohm resistor. Volume up connects a 670 ohm resistor in series with the 330. Volume down connects a 2110 ohm resistor in series with the 670 and the 330.
Do you have a plan for addressing Mode/Voice? They're electrically isolated on the factory SWCs, but you've got them on a single DPDT switch. There's probably a way, but I'm a very visual type of engineer, and I can't really think through how it would work without drawing a schematic.
One thing I've thought of doing was getting a piece of plastic and molding it into the start button cubbyhole, then bondoing over it and sanding and painting so it's smooth, then installing the heated seat switches there, like in a NC Miata. I got turned off though because I am adamant about not significantly modifying factory wiring. I'm fine inserting pins, and I'm fine modding a $15 trim piece that I could replace if I had to, but I don't want to mess with relocating the heated seat switches, unless there were extension cords available for them that would plug into the switches and into the harness.
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