I found this diagram on the electrode (first google link):
that the black and blue wire goes power to the switch in the door.
Everything is correct, the fuse is also 5A (functional) and generally there is a 12V power supply.
What's the problem? Well, after switching to mirror heating, the switch in the door closes (checked by meter - it beautifully closes almost 0 ohms) with a black and green wire and ...... suddenly there is a large voltage drop on both wires to about 0.5V.
Also what is happening?
I also noticed that both wires go to the ankle under the driver's feet on the left (both wires checked and are OK over the entire length - almost 0 ohms).
Then from this ankle the cable causing the problem, i.e. black and green, goes to the comfort module (changing to WHITE and such also goes to comfort).
Here is the problem, because I unplugged all the mirrors (i.e. heating + control of both sides), generally all the electronics in the door except the mirror heating switch on the driver's side and the situation is the same all the time.
Also, in my opinion, the short circuit cannot be on the side of the mirrors, be it right or left, but somewhere on the side of the comfort module (which is very dry and Housing clean), because as per the diagram, the mirror switch contains both wires that go to comfort - it suddenly falls on them dramatically tense.
questions:
Does anyone have a comfort module diagram for the Passat B5 FL?
How to solve this problem in the sense of what may be damaged in it?
Ie. I suspect something there, but the car is still in motion, I do not have much time to analyze everything, so some diagram or a tip would help me a lot, thank you in advance!
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EDIT: I solved the problem next weekend, I will close the topic. The problem was with badly connected mirrors, and more precisely wires - someone had previously exchanged and figured out at the mirrors.

that the black and blue wire goes power to the switch in the door.
Everything is correct, the fuse is also 5A (functional) and generally there is a 12V power supply.
What's the problem? Well, after switching to mirror heating, the switch in the door closes (checked by meter - it beautifully closes almost 0 ohms) with a black and green wire and ...... suddenly there is a large voltage drop on both wires to about 0.5V.
Also what is happening?
I also noticed that both wires go to the ankle under the driver's feet on the left (both wires checked and are OK over the entire length - almost 0 ohms).
Then from this ankle the cable causing the problem, i.e. black and green, goes to the comfort module (changing to WHITE and such also goes to comfort).
Here is the problem, because I unplugged all the mirrors (i.e. heating + control of both sides), generally all the electronics in the door except the mirror heating switch on the driver's side and the situation is the same all the time.
Also, in my opinion, the short circuit cannot be on the side of the mirrors, be it right or left, but somewhere on the side of the comfort module (which is very dry and Housing clean), because as per the diagram, the mirror switch contains both wires that go to comfort - it suddenly falls on them dramatically tense.
questions:
Does anyone have a comfort module diagram for the Passat B5 FL?
How to solve this problem in the sense of what may be damaged in it?
Ie. I suspect something there, but the car is still in motion, I do not have much time to analyze everything, so some diagram or a tip would help me a lot, thank you in advance!
--------
EDIT: I solved the problem next weekend, I will close the topic. The problem was with badly connected mirrors, and more precisely wires - someone had previously exchanged and figured out at the mirrors.