Try this link http://home.comcast.net/~chwilka/Error_Code%20_reader_reset_tool.htm

I went back and read that article a little. It focuses on the CIS trouble codes, but use the same procedure, except CCU codes are pin 7.

Also, that shows using only a diode and doesn't show the cathode and anode. When I did it, I made a box that had the switch and the diode and it also has a lead that picks up B+ from the battery. I expect you should be able to make the one in the article work once you determine the polarity for the LED.

Hope this helps,
Larry