Parking lights? What for?
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If you want to add it, I think this article should show you how. Evidently the wiring is already in place to make it work..
How to install a euroswitch on 2010 VW Golf, 2011 VW Jetta (and newer)
http://www.myturbodiesel.com/1000q/a6/euroswitch-drl-vw-golf-jetta.htm
The turn signal bulbs would light but not flash. Looked all around for the turn signal flasher plugin but it does not exist. Turns out that it is a relay built into an $800 nonrepairable Lighting Control Module box (LCM). Idiots! Do they not think that turn signal flashing contacts wear out!
Thank god for the net. Found instructions on how to cut the white-red and blue wires to the LCM and jumper them with a turn signal flasher plugin. Two hours of head time under the dash and a $7 flasher and things are fine again.