Driver window buttons not working

Manitank · Post by **Manitank** » Wed Feb 21, 2024 8:48 pm

Had the AA fix a miss fire and after that drove the car this evening and the driver side 4 windows don't operate, they worked once and now stopped, the wing mirrors work fine and when you take roof off.
Please help only had the car 4 months

AnubisZed · Post by **AnubisZed** » Thu Feb 22, 2024 8:13 am

Sounds like the unit is faulty, this can happen when moisture gets into the PCB, this then burns out the circuit and the only option is to replace the whole thing.

You can buy used ones, but you never really know how long they'll last.
This is the cheapest brand new, genuine, one on eBay...
https://www.ebay.co.uk/itm/326016285270

Manitank · Post by **Manitank** » Thu Feb 22, 2024 12:25 pm

Thank you Dave, it works intermittent but just fed up tbh as a bit of rain yesterday and this happened after AA came out. Is it easy to fit yourself?

B21 · Post by **B21** » Thu Feb 22, 2024 1:05 pm

Echoing the post…I had this issue on my 20i following an inadvertent washing of the switch by moi…stopped working in exactly the same way…but..it was very warm and two days later returned to active service….its pretty easy to pop out in the normal BMW push fit style..

Manitank · Post by **Manitank** » Thu Feb 22, 2024 1:42 pm

Oh ok brilliant I will leave for a few days and see what happens but hope it starts working again.

AnubisZed · Post by **AnubisZed** » Thu Feb 22, 2024 1:52 pm

Easy to replace, you have to note that there is a piece that sticks backwards (shown with the arrow on the photo), so prise up from the front and then slide forwards to remove and slide in backwards and then down at the front to fit. It has a standard BMW slide-clip connector for the wiring loom and you're all done

Manitank · Post by **Manitank** » Thu Feb 22, 2024 10:21 pm

Thank you

enuff_zed · Post by **enuff_zed** » Fri Feb 23, 2024 9:36 am

And just to add, not all had folding mirrors so make sure you get the correct switch unit.

B21 · Post by **B21** » Fri Feb 23, 2024 11:09 am

enuff_zed wrote: ↑Fri Feb 23, 2024 9:36 am And just to add, not all had folding mirrors so make sure you get the correct switch unit.

There are 4 different versions!!

Usel · Post by **Usel** » Fri Feb 23, 2024 7:33 pm

You could take the switch unit to bits and brush/clean the circuit board with 99% isopropanal alcohol and clean all the other inside gubbins too.

If when opened it looks and feels like a sugary drink has been spilled into the switch then wash everything with soapy water except of course the circuit board.

flybobbie · Post by **flybobbie** » Sat Feb 24, 2024 8:04 pm

Does it illuminate ?
My switches failed with windows stuck down.
Door card off i clean contacts on connector and refitted, no problem since.
Must be bad negative, reason why illumination out.

Manitank · Post by **Manitank** » Sun Feb 25, 2024 6:32 am

Yes all is fine now left it for 2 days now working again.

flybobbie · Post by **flybobbie** » Sun Feb 25, 2024 8:42 am

Always thought stupid place to put switches and exactly where water drips in if window is open.

N4LLY · Post by **N4LLY** » Sun Feb 25, 2024 11:09 am

flybobbie wrote: ↑Sun Feb 25, 2024 8:42 am Always thought stupid place to put switches and exactly where water drips in if window is open.

^^^^ This.

First left turn and it's flooded !!

Z4-forum.com

Z4-forum.com