guysy

Thanks for the reply, this time before I went out I listened for a relay click, Im not sure if it was there before but I pushed all relays in a bit earlier, and there is definitely a click now... 

And some success, not sure if its all working but definitely had warm working mirrors this time. I need to wait till it mists up or get a kettle out and check if its solved the rear screen. 

I will report back. Cheers.

I see the heated rear screen switch itself is incorporated into the climate control unit, and not a separate switch (I had it in my head that the switch was on a lower panel separate to the climate control unit but it isn't.

I will remove the head unit tomorrow and check all of the plugs are in the climate control properly.

Sadly I don't have a VCDS scanner available, I am planning to purchase OBDeleven as I've heard its fairly good?

Does anyone know if any of these (im guessing the 2 smaller if any) is the relay for the heated rear?

Thanks.

Hi, thanks for the reply.

Sorry I forgot to mention I had the boot hinge rubbers down and the wires looked clean both sides with no cracking etc.

I have just turned the engine on, pressed the rear screen button, it lights up as normal, this time I have taken the right wing mirror glass out (as I have read the heated wing mirrors work with the rear screen switch on) and there doesn't seem to be any voltage going through them.

All internal fuses seem fine I have checked them.

Could it be a relay issue? I see they are behind the interior fuse box and a pain to get to without unscrewing the fuse box?

Would there be any fuses in the engine bay that control the heated screen / mirrors? Ive given them a look over and they all seem intact. 

Thanks.

Hi,

I am new to the Audi world, I have a 1.4tfsi 2010 A3 and I'm working through the small niggles as I find them.

As its got colder I have realised the rear screen demister does not work at all. I am questioning weather the heated wing mirrors are as well but I *think* they are ok. I am going to put a multi meter across the terminals at some point.

Going back to the rear screen I have had the boot lid cover out to try and fix the issue, no tabs are broken on the element wiring, the fuse is fine. So I am trying to rule  out if its the "antenna booster" module, pics below. It seems the heated screen power wires go into this unit, the 2 right black blocks seem to be left and right. 

Can anyone shed some light on this for me? is it likely to be a failed unit, or do they rarely fail?

I need to do some more investigating, I also need to check the switch although that lights up when pressed and stays on for its timing.

Thanks