1 - Pink - level
2 - Grey - signal
3 - Blue - Power Ant (not connected on wiring harness)
4 - Black - 0v
5 - Brown - TX
6 - Red - RX
7 - Purple - unknown (not used in PCATS tuner)
8 - Blue - 12v

If you are unsure of the numbering of the Molex connector,
please check Patrick's tuner manual at http://www.pcats.co.uk/manual.html

The purple wire is probably one of the I2S lines.
The other two I2S lines are actually shared with the AM/FM wires.
No clue which wires are what though and from what I remember
it's not even been tested. Hugo said that it was to support DAB tuners.