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.
Finally got round to spending a couple of hrs on this before lack of daylight stopped play..
All bulbs were blown but not a simple fix today as they still don't light up. No power on the red/white wire at c244. Looking at the wiring manual that wire also feeds the top switches and clock illumination so looks like an issue up behind the top facia somewhere as all that and the clock all light up.
I also discovered that the red/white wire at c244 (unplugged) bells out to ground!
If I'm seeing this right? That wire is chaffed through somewhere after the top switches but before c244. I'm not very good with electrics but I do find it interesting.
More play tomorrow hopefully.
You do seem to be reading it right, There's a splice somewhere between the top switches and the HEVAC so your theory that the wire to the HEVAC has come adrift and is grounded on something would seem to be correct.
But does the RW wire show a real short to ground, or just the combined parallel resistance of the bulbs in the clock, fascia, switches, instrument pack and radio ? . . . . . i.e. zero ohms or a bit more ?
Rave shows the splices S209 & S210 in the diagrams but un-helpfully not where they are located
Pete12345 wrote:
But does the RW wire show a real short to ground, or just the combined parallel resistance of the bulbs in the clock, fascia, switches, instrument pack and radio ? . . . . . i.e. zero ohms or a bit more ?
Rave shows the splices S209 & S210 in the diagrams but un-helpfully not where they are located
Oohhh...bit above my pay grade that one.
I didn't read the ohms just listened to the beeepp. It seems logical and easiest for the splices to be behind that upper panel but who knows.
He decided to carry on the investigation at home rather than come over to mine but during a phone call he found no issues obvious with the wiring, ohms were low with everything unplugged so the gone to ground thing was a red herring. Plugged the hvac back in and everything is working again he says. He has an aftermarket radio so I've suggested he pulls that out and check for an iffy red/white wire there before he puts everything back together ready to go back to work around 2pm today. My thinking is either whilst looking for a chaffed wire he has moved a dodgy connection enough to resume power back to that red/white wire OR the after market radio is pinching it .