Drivers mirror not de-misting

Audi Bairn · Sep 13, 2019

I know I'm on the A3/S3 forum asking about a TT but there's likely to be more responses here.
Been using the wifes TT to even up the mileage a bit on the two cars.
Noticed the past two mornings that the drivers mirror ain't demisting (the passenger one is).
Any quick fixes I can do myself? Trying to avoid a garage trip if poss.

AlS3BE · Sep 13, 2019

Check fuse first. If fuse is ok then pull the mirror out and get a multimeter across the terminals on the mirror to see if there’s any voltage across them. Could be corroded terminals on the mirror as it’s just spade terminals. Had that on my a6 quick scrub and wd40 it all worked.

Flying Scotsman · Sep 13, 2019

That is a good response from AIS3BE. If that is the case is the case, a great product to use is Corrosion X ( If available in the UK) It is a far superior product to WD 40. It prevents corrosion and maintains electrical continuity.
I had the same issue with VAG heated mirrors in the past and now treat them with Corrosion X after I pick up my new cars and no issues.

lee red · Sep 13, 2019

I recently had this problem turned out to be the control module for the mirrors it’s inside the drivers door it was not sending any power to my drivers mirror for the demistter ..,warranty work

larbel · Sep 13, 2019

If you have VCDS or OBD11, you can do a output test and see if it's indeed working or not... Plus if there's break in the currents or malfunction, it should throw a code...

George_P · Sep 13, 2019

Yep, same on brand new s3, very annoying

Audi Bairn · Sep 17, 2019

I think it's going to have to go back in under warranty as I've tried everything I can given my limited abilities

Thanks for all the input, appreciated.

AlS3BE · Sep 17, 2019

Have you turned the knob to heated mirror?
Not trying to say you are an idiot but lots of folk think it turns on with the heated window and not the mirror switch.

Flying Scotsman · Sep 17, 2019

He stated that only the drivers mirror was misting and the passenger one was receiving heat.

AlS3BE · Sep 17, 2019

Flying Scotsman said:
He stated that only the drivers mirror was misting and the passenger one was receiving heat.

Need to stop skimming post while at work :wink:

George_P · Sep 18, 2019

AlS3BE said:
Have you turned the knob to heated mirror?
Not trying to say you are an idiot but lots of folk think it turns on with the heated window and not the mirror switch.

After 6 months of owing S3 I've found the knob! Thanks

AlS3BE · Sep 18, 2019

George_P said:
After 6 months of owing S3 I've found the knob! Thanks

At least my comment helped someone. :icon thumright:

Audi Bairn · Sep 18, 2019

AlS3BE said:
Need to stop skimming post while at work

I'm guilty of the same myself, no worries

Audi Bairn · Oct 1, 2019

Car went in to dealers on Saturday.
Was the heating element, so glass etc in mirror changed under warranty so all good now.

Sparks43 · Oct 1, 2019

Audi Bairn said:
Car went in to dealers on Saturday.
Was the heating element, so glass etc in mirror changed under warranty so all good now.

That's good it's all fixed - mind you, you would have probably broken the glass getting it out to check the terminals anyway - My mate who works for Audi always orders a new glass when doing any mirror work because they invariably break

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Drivers mirror not de-misting

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