Make Sure to Add a Ferrite Ring to the RJ-45 (Tuner) End of the Cable

For 5.1 boards

DB-9(female) Pin # Wire Color
2 Green
3 Red
5 Yellow
RJ45 connector pinout:
With clip facing down and end of connector facing you

1 empty

2 yellow

3 empty

4 green

5 empty

6 empty

7 empty

8red

Make sure to add a Ferrite ring to the RJ-45 (Tuner) end of the cable.

NEW STYLE for 5.2 boards

1. Check the continuity of your EEC-Tuner cable with a multimeter...only 5 of the wires in the 9 pin serial cable are used.

I dissected the broken eec tuner cable and came up with the pin out.

DB9
(the pins are numbered on the connector)

RJ45

DB9(9pin) <=> RJ45(8pin)
pin #2 <=> pin #5
pin #3 <=> pin #1
pin #4 <=> pin #3
pin #5 <=> pin #7
pin #9 <=> pin #2