In my 2010 I used one of the wires from the homelink. Not sure about your 2012. Just take a meter and see where you are getting 12v switched from and use the chassis as ground.

 

My Bentley Manual is thru 2009 and says switched power to Day/Night mirror is from 5A fuse SC49 is black with green stripe, ground wire is brown.

 

If someone would post a few images of the install using the Homelink power source it would be appreciated.

 

I wound up tapping power from the HomeLink system as other have done. I followed these awesome step by step instructions (with photos) found here http://forums.vwvortex.com/zerothread?id=1149500.

I also found a great website to order the cable (http://www.safe-n-sound1.com/Products.html) ... These guys were AWESOME. I chose a cable for an Escort, with inline chip-style replaceable fuse, AND a wired mute button and then had them customize the lengths of all parts (mute line 9", power line 18") ... shipped with a T connector power tap, zip ties, everything I needed. They made it and shipped it the day I ordered it! Arrived 2 days later (and all for under $20). They make cables/connectors for all major brands.

And for those that were also asking ... switched power from HomeLink is the black cable with the thin (and faint) blue line (you need a flashlight to see the blue line). The author of the link I provided above did an AMAZING job documenting his install.

Soup to nuts this entire effort took less than 30 minutes to complete and was SUPER easy ... Oh, and I mounted the mute button behind my mirror - it works great ... exactly like the one on the smartcord that came with my 9500ix.

 

For the record, this in a 2012 Touareg Sport w/ Nav

 

Guys - I provided the wrong link to HomeLink instructions (sorry)!! Correct link is http://www.clubtouareg.com/forums/f73/valentine-one-install-2012-touareg-82289.html

 

http://www.clubtouareg.com/forums/f73/valentine-one-install-2012-touareg-82289.html

 

Thanks much for the links. This looks rather straightforward, even if one does not have a Valentine. I have 9500i.

 

That's very useful!

 

Thanks!