Feeds the switch illumination on the hvac buttons? Asking for a friend.
Ta.

Not sure what you are after. The button illumination is fed from the sidelight circuit on pin 6 of C244 (Red/White wire).

It looked clear to me at the time when I typed it, read your reply, read my post again and yes, I agree, nobody could work out what the hell I was asking lol!
OK...my friends 2001 hvac bottom row button illumination is temperamental, sometimes they lite up, mostly not. Points to a dodgy connection on the multiplug on the rear of the hvac. He struggles with free time from his job and would like to know which terminal or wire colour he needs to look at to repair at that muliplug. Being quite new to 38s he wasn't aware, neither was I, that online electrical rave stuff is out there, I've just downloaded that but also purchased a paper copy of both that and the workshop manual for us both to share. They won't come until next week. Trying to read the manuals on a phone is frustrating but that's all we both have until the paper manuals arrive.

I'd be more inclined to suspect iffy connections at the bulb holders on the back of the HEVAC. There's two bulbs on the bottom but I think (without pulling one apart) that one lights a light pipe for the buttons along the bottom while the other slights the ones on the side (heated screen. rear window buttons). Taking the bulbs out, checking them and cleaning the contacts on the board where they go in, is a good idea whenever the HEVAC is out.