I'm currently installing the module and there are 4 wires, but only 1 is where my question lies. In the schematics, is shows the DGRN/RD going to the amplifier, but does it serve as a remote on or what? This thread didn't mention it. FYI, I didn't have to modify any wires to connect to the defroster. It might be due to the defroster ends look differently (all solder joints) than in that thread.
If you look at the 2nd page of section 8W-48-3 in whatever year FSM, you will see that the Dark Green/Red wire is labeled "Radio 12V Output" - so yes - it powers the module (antenna amplifier) from Mr. Radio.