E86 Z4 - Master Window/Mirror Switch Fault

A

AEDD22

Member
 Winsford
Good evening fellow members!

I’m trying to resolve a fault which I have with the drivers master window/mirror switch although after swapping the unit, I’m at a loss what the fault could be and hoping for some help.

For context, the windows work fine but I’m having an issue with the mirrors, before swapping the unit, I could only adjust the mirrors left (both sides) no other function worked.

I swapped out the unit for one I bought off someone in the Z4 group on FB and thought I’d miraculously fixed the issue, you can guess what’s coming next…

After swapping the unit, I can now adjust the mirrors left and up but can’t adjust them right or down 🤣 am I just unlucky and have potentially bought a unit that perhaps has the same issue (but opposite) or, could it be a wiring fault/dodgy fuse.

Any ideas?

Either way, on a more positive note, I’ve had the suspension swapped out for Bilstein B4 and Eibach lowering springs and the car drives so much better albeit for a new knock at the rear left when corning at high speeds which I need to investigate.

Thank you,
Andy
 
Common fix for this one before you go buying a whole new switch, pop the master switch panel out (careful pry with a plastic tool at the doorjamb side) and check the circuit board underneath the rubber touch pad.

These switches get gunk and corrosion built up under there over time, and a lot of people have fixed window or mirror issues just by cleaning that board carefully with electronics cleaner.

One thing to know though, cleaning usually restores window function fully, but mirror adjustment sometimes only comes back partially (one direction working instead of both) if the corrosion is deep enough.

If cleaning doesn't fully sort the mirrors, that's your sign the board itself is too far gone and you're looking at a replacement switch instead.
 
larryjune508 said:
Common fix for this one before you go buying a whole new switch, pop the master switch panel out (careful pry with a plastic tool at the doorjamb side) and check the circuit board underneath the rubber touch pad.

These switches get gunk and corrosion built up under there over time, and a lot of people have fixed window or mirror issues just by cleaning that board carefully with electronics cleaner.

One thing to know though, cleaning usually restores window function fully, but mirror adjustment sometimes only comes back partially (one direction working instead of both) if the corrosion is deep enough.

If cleaning doesn't fully sort the mirrors, that's your sign the board itself is too far gone and you're looking at a replacement switch instead.
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Thanks @larryjune508 for the advice! I’ve already got a spare unit handy as thought that would resolve the issue, turns out I think that also suffers from the same thing.

I’ve picked up some contact cleaner and going to take a look at it this weekend, fingers crossed none of the units are too far gone. Thanks for your help 😎
 
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