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MK5 – Interior light stays on, battery drain

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t4jo:
Hi,

I have an issue with my MK5. Sometimes when I lock/unlock the car, the interior light (above rearview mirror) stays on and drains the battery.

Dashboard shows all doors closed. Problem happens only sometimes.

What I’ve done:
   •   replaced driver door lock
   •   replaced all wiring in driver door

Still the same.

When the issue happens, I hear an extra locking sound from the passenger side (like it locks twice). At that moment, the interior light stays on.

So I think it could be:
   •   passenger door lock (microswitch?)
   •   wiring in passenger door
   •   or comfort module

Also, question: how should the lock/unlock buttons on driver door work? (see picture)
On my car only the lower button (lock) works, upper button does nothing.

Any ideas?

Pictures: https://imgur.com/a/rKogUvA

Thanks 👍

GVK:
We can't view Imgur in the UK any more  :slap:

t4jo:

MKVASMR:
Get an amp clamp or a multimeter. Set it on the battery and measure mA. Then pull fuses with the car being locked and eventually you will find where your drainage is coming from.

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