Mine failed when the car was almost new back in 2007 and was replaced under warranty.
A new LCM (light switch contains the entire light control module) is big bucks - like $400 new. I'm pretty sure it doesn't need to be coded because I replaced the switch in my 2nd Z4M when I was having panel dimming issues, and it worked fine without coding.
I like the contact cleaner suggestion above. Good luck!
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'21 M2 Comp
'19 Golf R
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