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Old 11-18-2010, 07:28 PM   #15
climbhigh09
Scooby Specialist
 
Member#: 254163
Join Date: Aug 2010
Chapter/Region: MAIC
Location: MD
Vehicle:
2011 WRX 20GXTR
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The BT (and other wheel controls) seem to be a variable resistance circuit which is nominally open. Meaning, it's only a few wires which send different amperages (assuming volts are held at 12) to the HU depending on the button pushed. Or at least that's how I read the schematics:



It seems like a stretch to assume that the industry would have standardized how many amps trigger song forward, mute, etc; but maybe they have (which would make finding a compatible HU feasible).

For now, my rooted phone lets me keep it awake while in my car dock, so at least I don't have to unlock it while driving. That, and I programed the volume rocker to skip songs when long-pressed. It's just not on the wheel... X-(
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