There's probably a TOD code stored that'll give ya some clues.
Numbers 4 and 5 are the GND terminals.
This is a wire that you use to jump the terminals at the data port-
Here's a video I made showing the TOD check light flashing the code.
The code is 12 of course, meaning everything is normal.
5 seconds, 439 kb, wmv file-
http://www.drivehq.com/file/df.aspx/publish/mgpa/vids/tod.wmv
5 seconds, 5.9 mb, mpg file-
http://www.drivehq.com/file/df.aspx/publish/mgpa/vids/tod.mpg
Mark Griffin