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From what I have gathered you need an adapting loom to go with the new switch, but the looms aren’t cheap

I was just reading an old thread regarding the heating of the mirrors, could it be a combination of bit 2 and 3 in the long coding as to why mine arent working do you think?

viewtopic.php?t=78020

Mine is the gti version so the battery is located in the boot, there are some electronics in the engine bay and also some (I think) attached to the side of the battery. Not 100% sure.

I’m at a loss, I’ve checked the loom to the tailgate and it’s fine, no broken wires. Changed the fuses again just in case and still nothing. It’s all very strange

All other tailgate electrics are working fine

Ok yours has an 18mm front roll bar

You want part number 6Q0411314R

They are only £6.29 retail at vw each, quick search on eBay shows a pair at £12.99 delivered. Genuine vw ones

Oe ones aren’t that expensive to be honest, i can check the part number if you don’t mind sharing your chassis number

Your a legend, I’ll have a look at the loom..might weekend before I get chance

On long coding it says

Rear window heater activation via can Active

Mirror heating on while rear window heating on Active

Rear window heater Installed

Heated mirrors Installed

Check in Long coding if it's enabled. - Maybe there is an wire-ing connections and someone disabled the option so it doesnt pop a dtc fault.
I think under adaptations you can set the timer for how long the defrost function is going to be ON.

https://uk-polos.net/viewtopic.php?t=75392&start=45 ...

No it’s never worked since I got it

Mine had cloth tape but the wires were broken. Why dont you try taking some measurments on the defroster grid

You dont have any errors stored in bcm?

What happens when you turn the knob on the mirrors to defrost position?


Maybe it’s worth me opening the cloth tape then and seeing the ...

In the BCM there is an option to enable or disable rear defroster in long coding.

You should also be able to run output test on the derfrosters. If they work then you have a probbably issue with switch.

If it doesnt work then the issue in wires


I did run an output test and the led for the ...

amer6R wrote: Mon Feb 27, 2023 9:50 pm Get a probe test light, and see if there is power on the fuse, on the rear window defroster etc.

I did check the fuses and it’s showing voltage at the fuse, I’m thinking it can only be either coding or a broken wire somewhere or bad Earth?

Just checking through the various settings, in the can gateway it says front heating/air con is set to 0 should it be set to one?

Are you checking for voltage on the rear screen and mirrors with the engine running? Both of these functions are high load heavy consumers of current.

Equally this could be a faulty switch ?


I’ve tried a new switch on both, no change. Yes engine on and running. No voltage at mirrors, haven’t ...