Dock pinout info
Took apart both my NEXUS1 desktop Dock and Car Dock and tried it on my MYTOUCH 4G.
THE POINT CLOSEST TO VOLUME TOGGLE== 5 VOLT(RED)
THE POINT NEXT TO MICRO USB PORT====GROUND(BLACK)
THE MIDDLE (GREEN WIRE) SETS OFF===== DOCK APP.
(BOTH CAR AND DESK TOP DOCK start only desktop dock app and not car dock app). AND BLUETOOTH DID NOT ACTIVATE.
AND BLUETOOTH IS NOT PICKED-UP BY MYTOUCH 4G.
Hope this helps somebody, somewhere..............