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Rear heated screen not working (mirrors fine)
Posted: Sun Apr 28, 2024 2:32 am
by Rossi1001
As above really! Enuff_zed (who is helping me, a lot!) mentioned in my project thread (link
here) that the fuses are good and the connections are firmly fitted to the screen. What would be the next logical step to diagnosing where the problem is? Any tips would be much appreciated!
Rear heated screen not working (mirrors fine)
Posted: Sun Apr 28, 2024 8:35 pm
by Sidewaze Samm
Had this problem in my lad's zed - about five years ago, so can't remember the details... but IIRC there's two relays on the back of the fuseboard that are relevant. For some reason one of these was missing from his - a few quid for a new one from BMW and it's worked fine ever since.
Rear heated screen not working (mirrors fine)
Posted: Sun Apr 28, 2024 8:43 pm
by enuff_zed
Sidewaze Samm wrote: ↑Sun Apr 28, 2024 8:35 pm
Had this problem in my lad's zed - about five years ago, so can't remember the details... but IIRC there's two relays on the back of the fuseboard that are relevant. For some reason one of these was missing from his - a few quid for a new one from BMW and it's worked fine ever since.
I have a spare fusebox. What worries me is that one of the relays is inside it!
Rear heated screen not working (mirrors fine)
Posted: Mon Apr 29, 2024 6:02 pm
by Sidewaze Samm
enuff_zed wrote: ↑Sun Apr 28, 2024 8:43 pm
What worries me is that one of the relays is inside it!
Not sure what you mean by inside, Martin. I think these relays were on the back - remove glovebox, release fuseboard and carefully (ie not shorting out on the car) turn it over to get access to the back.
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 6:40 pm
by colb
https://www.youtube.com/watch?app=desktop&v=zQuGKq5jT4A
Fuse and Relay locations
Defogger rear screen is Fuse 25 5Amp
Relays for defogger is Relay R13 and R99 both on the rear of the Fuse Board
Diagram and list here
https://fusecheck.com/bmw/bmw-z4-e85e86 ... se-diagram
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 6:55 pm
by Rockhopper
I guess you’ve checked that it’s not in transport mode?
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 7:02 pm
by enuff_zed
Newtis shows one on the back and the other buried inside.
2 fuses, 20 & 25, both checked.
Relays K13 and K99
- Screenshot 2024-04-30 190406.png (176.82 KiB) Viewed 240 times
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 7:08 pm
by bigwinn
Chaps-
Steve locally has the exact same issue- which we have been chasing for ages including changing all the removable relays to no avail
We are now thinking it’s the relay on the flip side of the fuse board- see pics
Anyone done this yet? I think it’s the tyco relay…
- IMG_9761.png (302.04 KiB) Viewed 238 times
- IMG_9760.png (709.76 KiB) Viewed 238 times
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 7:29 pm
by enuff_zed
bigwinn wrote: ↑Tue Apr 30, 2024 7:08 pm
Chaps-
Steve locally has the exact same issue- which we have been chasing for ages including changing all the removable relays to no avail
We are now thinking it’s the relay on the flip side of the fuse board- see pics
Anyone done this yet? I think it’s the tyco relay…
IMG_9761.pngIMG_9760.png
Stuart! Yes! Exactly my point, it is likely to be that one because its a git to change.
I'm just going to suggest putting the roof down.
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 7:37 pm
by bigwinn
Come on! We can fix it!
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 7:53 pm
by bigwinn
Steve has procured a new fuse board so we will swap it out to see what happens
Rear heated screen not working (mirrors fine)
Posted: Tue Apr 30, 2024 8:00 pm
by enuff_zed
bigwinn wrote: ↑Tue Apr 30, 2024 7:53 pm
Steve has procured a new fuse board so we will swap it out to see what happens
I have a complete fusebox here.
Was contemplating swapping the whole thing.
Rear heated screen not working (mirrors fine)
Posted: Wed May 01, 2024 12:42 pm
by colb
Seen a couple of cars with duff defoggers but not explored the cause on either so watching the progress you make. If it is that relay on the board then trying a different fuse board probably worth a go. The two cars I have seen it may be a simple fix for them.
Rear heated screen not working (mirrors fine)
Posted: Fri May 03, 2024 7:42 pm
by Rossi1001
bigwinn wrote: ↑Tue Apr 30, 2024 7:53 pm
Steve has procured a new fuse board so we will swap it out to see what happens
Some amazing knowledge on this thread! Thank you!
Stuart do let me know what happens with your car! Martin is helping out in June sometime, so there's a bit of time yet before we have a go at fixing this. I wish it was just a simple fuse change!
