| This is what my 91 TT looks like: 
Here's diagram that shows the way the pins are numbered.
The way I read what the pins are from the FSM: 1 Blue Data from interface to ECU pin 21 (Rx)
2 White Data from ECU to interface pin 22 (Tx)
3 X
4 X
5 X
6 Black/white Diagnostic mode input to ECU pin 47
7 Green/white +12 V Ignition switch
8 Black Ground
9 Orange/white Clock from interface to ECU pin 31
10 Yellow/white ?
11 Black/white ?
12 X
13 X
14 X [ As an aside, I bought one of those Hong Kong Consult interface cables and I can't get it to work with my laptop and car. Same symptom, the programs all say they cannot connect to the ECU. The LED on the interface lights, so it must be getting power. I've tested the serial port on my laptop with a loopback plug and it's working. So, must be some problem with the interface or the wiring in my car. ]
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