Not off hand, ill have a look to see if etka has details. I think the purple one connect to the antenna amplifier, which then goes to the roof antenna
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2004 A8 3.0 TDI Sport Brilliant Black
Came with: Black Valcona/Alcantara Leather, KESSY, rear blind, flappy paddle gear change, Phone Prep, TV
Added:Bluetooth, AMI, Hybrid TV, Parking plus, Ski hatch, towbar, DAB, Umbrella Holder, Reversing camera, Auto lights, Wheel refurb
Things to fix: Turbo fault, power drain
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