With Bose all speakers are driven form Bose amp, none directly from radio.
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Connector C is actually three separate connectors dovetailed together. It may not be present at all - sometimes, only parts of it are present. It usually comes attached to the device it supports:
C1 - external amplifier or equaliser
Pin 1 - Line out left rear
Pin 2 - Line out right rear
Pin 3 - Line out ground
Pin 4 - Line out front left
Pin 5 - Line out front right
Pin 4 - +12v switched - maximum 150mA
C2 - remote control
Pin 7 - RXD
Pin 8 - TXD
Pin 9 - Chassis ground
Pin 10 - +12v switched - maximum 150mA
Pin 11 - Remote control in
Pin 12 - Remote control ground
C3 - CD changer
Pin 13 - CDC data in (bus)
Pin 14 - CDC data out
Pin 15 - CDC +12v permanent
Pin 16 - CDC +12v switched - maximum 300mA (+A)
Pin 17 - CDC data ground (+U)
Pin 18 - CDC audio frequency ground
Pin 19 - CDC audio frequency left
Pin 20 - CDC audio frequency right
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Look at the connector C, looks like you got adapter kit for non Bose cars which only connects line-out for rear speakers and assumes front speakers will be driven directly from unit. You will need adapter kit specifically for Bose for all 4 outputs which connects all pins in C1.
You will probably need a kit that takes signal from speaker level output and connetcs it through resistors to amp as most aftermarket radios use 1.5V line-out but audi system 3.5V so if you run it from line-out it will be very quite.
Looks like this one should do the trick:
http://www.ebay.co.uk/itm/Radio-Adap...item19e3871780