S500 Auto dimming mirror wiring info needed

[2phast]

There are three wires for connection on this homelink/auto dimming mirror. Brown, blue/white and red.

Can anyone tell me which wires are +12 volts, ground and which one is for the reverse bypass? I can make some logical deductions here but don't want to destroy this mirror. Normally, brown is ground on Mercedes, that leaves the blue/white and the red. The homelink transmitter only has two wires, a brown and a blue/white, which leads me to believe the blue/white is +12 volts.

Any one have a wiring diagram to confirm this?