Mercedes W202 Airflow Issue: Intermittent Fan, Voltage Variations, Resistor Control & Panel Test

The problem with the air supply started that once it worked, once it did not, but now it has completely stopped working. I checked the fan power supply and it turns out that there is current on 2 thick wires and a voltage from 12v to 6v on the third thin cable from the resistor control (depends on how the knob is set on the supply), but if I connect a 5w bulb to this thin wire And now the question is whether it would result from a damaged panel, which is the airflow control knob. The fan is functional because it works for a short time. the fan power cube consists of 3 wires, 2 thick and one thin.

I wrote about it before - the W202 with a traditional key has a COMPLETELY DIFFERENT ELECTRICAL SYSTEM than the W202 with a "fish" key - this information is not available again, and in this case it is very important. The thin cable is only the voltage that controls the airflow - there is not enough current there to light the bulb. The voltage across it should vary from about 0.5 volts for a minimum to about 7 volts for full power. It is the other way around with you - you have not measured it in terms of the plus?

from what I remember it was 5v on the first gear on the last 12v

The fan resistor was the fault of the lack of air supply. It should be of some use to someone. 3 wires go to the fan, the side wires are power, i.e. ground and + after ignition, the middle wire is fan control. I will write what voltage I had from 2 fan control panels. In the first gear it showed me a second panel of 9.94v on one 10.16v panel. Fifth gear 5.59v second 4.59v panel. On these 2 panels the fan is working normally.