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The micro switch for the interior light is an internal part of the door latch , sadly it’s a common issue on all vw’s.
Your only option is to replace the door latch on the offending door , check all doors work the interior light
Is it possible this fault has sonthing to do with the passenger door? The passenger door doesn't work with the central locking, I have to unlock it with a key, I can't even open it from the inside, the only way it can be unlocked is with the key.
Can I take it your car is a 3 door not a 5 door ?
If yes then both door latches have a micro switch in to control the interior light operation which work independently from each other.
Sounds like your passengers side door also needs a new latch as I said these are common failure points on most vw models, if you can get the OEM part number for both door latches ( different for either side) then you can source these online from eBay etc at a fraction of the cost of genuine parts,I’ve just bought a drivers side item for £21 delivered with a 2 yr warranty.
No not really just more doors mean more latches to fail ,does the passenger side front door operate the interior light?
Also just check the rear doors also operate the interior light
It’s not too bad a job to replace but it does mean completely stripping the inside of a door to replace them.