You haven't counted correctly. We completely dissected our docking connector's wiring in order to successfully install the Empeg into my VW Jetta, and it's using all 16 pins, as follows (note that I don't know which signals are carried on which wires in the serial cable):

1: +12V (and +12V line on serial cable)
2: Serial Yellow Wire
3: Rear Output Right
4: Rear Output Ground
5: Rear Output Left
6: Aux Input Right
7: Accessory Power Out / Serial Blue Wire
8: Antenna
9: GND
10: Serial Red Wire
11: Front Output Right
12: Front Output Ground
13: Front Output Left
14: Aux Input Left
15: Aux Input Ground
16: Antenna Ground

Lots of different grounds - but they're all necessary, as I'm sure someone from Empeg will tell you as well... :)


-----
Daniel M. Zimmerman
Caltech Computer Science
[email protected]
_________________________
Daniel M. Zimmerman Mk.2 #060000058, 36GB Mk.1 #00101, 10GB