[Solved] Skoda Octavia 2.0 16V: Inconsistent Parking Sensor Measurements with Ohmmeter

The parking aid system does not work - the controller beeps a few seconds after turning on the reverse and turns off.

I removed all 8 sensors and took measurements with an ohmmeter as follows:
Pins: 1 - 2 -3.
There was always an indication of resistance between pins 1 and 3 and then disappeared immediately.
Between pins 1 and 2 approximately 1800 ohms continuous.
Between pins 2 and 3 approximately 1800 ohms continuous.
According to the above measurements, I considered the sensor to be operational.
Unfortunately, not all sensors gave such indications, two sensors gave the first measurement positive and the next two negative.

I bought and replaced these two sensors. The system still does not work.

I measured all the sensors again and again there was one (not new) one that had negative last two measurements.

I am going to buy it. But it seems to me that it could be such endless buying.

Please, let someone familiar with the subject revise if I am doing well, I am a bit of a waste of money.

The parking aid system is diagnosable and you have to start with that.

Nice photos from which nothing appears, when reading is the reaction of the sensors to the obstacle? This power error is the only one saved?

This is the only mistake. No reaction of any kind. After turning on the reverse, a four-second signal and that's it. The obstacles are placed at different distances. Probably only measurements.

Switch on reverse on the ignition and put your ear to the sensors. A fit makes a nice sound.

Neither of the sensors makes a sound in any case. Today I disconnected the sensor plugs from the controller, leaving only the "power" one, and checked the leads supplying the front and rear branches of the detector power supply (front pins 1 and 2, back pins 8 and 11) and no power, no voltage.

T5 wrote:

Switch on reverse on the ignition and put your ear to the sensors. A fit makes a nice sound.

This car cuts off the rest with one damaged car.

Ireneo, it means that when one sensor is damaged, then the controller cuts off the power to all of them?

The tester will show which sensor is not working, the ear will not help here. I use my finger instead of the ear, but not the vw group.

Welcome back.
I did a test of sensors in my friend's car -> they are all working.
VCDS informs about lack of power supply to sensors -> all.
I made voltage measurements at the input to the sensors -> no voltage.
I made voltage measurements at the output from the controller to all sensors -> no voltage.
Measurements taken at the moment of ramming the vehicle back.
The controller communicates with the OBD.
I know that the sensor power supply in the controller is damaged. I looked at the driver board and found no overheated components or blown circuits. Due to the fact that the driver costs a lot, I want to try to repair it. Does anyone have a schematic of this driver? Which component could be damaged? Maybe some other advice of yours.

Short circuit at the output, I understand you don't have?

There is no short circuit.

I cleaned the contacts and it went.