Hi, I wanted to add this information to the wiki, but I have no editing rights there. Maybe somebody of you wants to add this information to http://gamesx.com/wiki/doku.php?id=av:wii_multi_av_pinout (Pins 14-16 not doing anything for PAL Wiis).
I only tried pin 15 (data line 2) and measured the pin 15 voltage post-mod with a multimeter, which was indeed 5V, yet the Wii still output 576i50.
On hardwarebook.info, it's also stated that pin 16 (data line 3) seems to not work on PAL Wiis: http://www.hardwarebook.info/Wii_A/V
I guess that they only tested pin 16, most likely none of the D-Terminal data pins work on PAL Wiis.
That raises the question whether those pins only work on NTSC-J Wiis, or also on North American NTSC Wiis?
Also, on http://gamesx.com/wiki/doku.php?id=av:av_converters you could add the Component to RGBHV transcoders Mayflash VGA005 (converter box), Mayflash VGA004 (Wii+PS3 converter cable) and Extron CVC 100 / 200 / 300.
The forum is tied to the wiki, so an account created here will apply to the wiki, same login credentials are used.
Once you make two forum posts, you'll be upgraded to 'small member' status, and that'll be the key to full wiki editing rights.
So if you simply reply to this post, you'll be able to add your wonderful new information to the wiki! Hurrah! =D
Welcome aboard. ^_^
Ahh, that's good to know! =)