the wire colours are listed onthere, but they're in german. there is a key though which tells you what the mean

e.g. sw = black, ge = yellow
first off you need to locate the plug you are after on the diagram, bit of detective work will help you here if you check the wire colours then match them up to the plugs in the diagram eventually you'll find it. also if you find out where each wire runs with a multimeter that'll give you a clue as then you can start with the item and work back thru the diagram to the plug.
are you sure its a 9 pin plug? because I've gone thru the entire diagram and there arnt any. if its the plug i think you mean its deffo T10a in the diagram! look at page 2, then look to the right in the key list for:
10a - 10-pin connector, in cable channel left in engine compartment
then look at the diagram for any references to T10a, that'll show you what pin on there does what. for example, on page 3 I can see that T10a pin 8 (shows as T10a/8) is the ignition live power feed for all the coils
