Rear heated screen not working (mirrors fine)

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Rossi1001

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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!
 
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.
 
Sidewaze Samm said:
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.
Click to expand...
I have a spare fusebox. What worries me is that one of the relays is inside it!
 
enuff_zed said:
What worries me is that one of the relays is inside it!
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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.
 
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-e85e86-2003-2008-fuse-diagram
 
colb said:
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-e85e86-2003-2008-fuse-diagram
Click to expand...
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
 
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
 
bigwinn said:
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
Click to expand...
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. :rofl:
 
bigwinn said:
Steve has procured a new fuse board so we will swap it out to see what happens
Click to expand...
I have a complete fusebox here.
Was contemplating swapping the whole thing.
 
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.
 
bigwinn said:
Steve has procured a new fuse board so we will swap it out to see what happens
Click to expand...
Some amazing knowledge on this thread! Thank you! :hattip: :ilz4f:

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! :headbang:
 
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