This information has been posted on this forum in the past.US VW Radio Navigation MFD2 DVD
At this point in time I can not access it - this is a re-post to answer an off-topic question in another thread.
Converting factory aux input supplied with Premium 7 (both single CD and six CD)
The factory aux connection supplied with the above head units is incorrect for the MFD2 DVD.
MFD2 DVD has more inputs than Premium 7 (both types).
The Premium 7 (both types) support Aux -OR- iPod connection (via external CD changer connection).
The MFD2 DVD supports Aux -AND- iPod connection (via external CD changer connection).
As a result, the nav's aux uses a different connector that would have no place on a Premium 7.
To convert for MFD2 DVD, the aux connection needs to be removed
from the 12 pin blue connector on the back of the head unit
found in positon # 6
and moved to a new 18 pin connector (VW PN 7M0-035-727 ).
Remove the 12 pin blue connector from the head unit, identify pin positions # 2, # 8 and #9,
and mark the wires in those positions to keep track.
Disconnect and disassemble the 12 pin blue connector to insert or remove pins.
The outer shell has ridges molded inside that when slid in place restrict the pins from moving.
It is a simple disassembly, the inner black pin holder slides out of the outer blue shell.
There is a release tab on the open side of the blue shell
red arrow is release tab for the inner pin holder, blue arrow is connector to radio release tab
and a circular opening on the other side
Pull back the release tab for the inner pin holder and push a small tool through the hole on the other side
to release and slide out the inner section.
Once you have removed the outer shell, use a pin removal tool to extract pins from the holder
from 12p blue connector pin 2 - to new 18p connector pin 2 - AUX Ground (black wire on the kit referenced below)
from 12p blue connector pin 8 - to new 18p connector pin 11 - AUX Left (white wire on the kit referenced below)
from 12p blue connector pin 9 - to new 18p connector pin 12 - AUX right (red wire on the kit referenced below)
More than likely the wire color codes on your factory aux connection will be different.
To select the Auxiliary input, first select the CD page, and then select the Aux soft key on the lower right
Reference: US head units, pin assignments for the 12 pin blue connector at position 6
(items in green US 2007+ Premium 7 only)
1 - Satellite radio tuner input, audio left
2 - CD changer, left and right port, audio Ground (GND) or Aux GND
3 - Satellite radio tuner input, audio Ground (GND)
4 - CD changer, voltage supply, positive, terminal 30
5 - Satellite radio tuner input continuous positive, terminal 30
6 - CD changer, DATA OUT (data exchange for CD changer control from radio system to CD changer)
7 - Satellite radio tuner input, audio right
8 - CD changer, left port audio, CD/L or AUX L
9 - CD changer, right port audio, CD/R or AUX R
10 - CD Changer, control signal
11 - CD changer, DATA IN (data exchange for CD changer control from CD changer to radio system)
12 - CD changer, CLOCK (internal test protocol for monitoring data flow)
The factory iPod connection is the same for a Premium 7 six disc, Premium 7 single disc and MFD2 DVD,
plug and play swap.
If you have a factory iPod connection and want to add an aux input too,
an inexpensive kit is available from VW,
VW part number 000-051-444-M - aux cable for DVD navigation head unit
Reference VW aux install instructions for US MFD2 DVD
FYI This is the flip side of the instruction sheet in the pic of the aux kit (above).
The side pictured in the pic is the EU instructions, NOT the SAME,
EU MFD2 DVD aux uses the blue connector, but different pins