Good morning, this is my first post. I hope someone will help me.

I have a car, a Subaru Legacy iv. Some time ago I decided to enrich it with parking sensors. Polish manufacturer, sensors front / rear and LED display with info which sensor and what distance. It was set up for me by a garage where the car was going through a tinsmith case.
And I have a problem. The system behaved strange after it was put on. Every now and then it showed that there was an obstacle on one of the sensors at the front. We concluded with the workshop that the sensor was nuts. We exchanged. Same. Well, the suspicions fell on the switchboard. The store replaced with a new one. Same.
Disconnecting the cable from the ill-fated sensor causes the symptom to move to the sensor next to it.
After x different combinations, I think I know what the problem is, but I don't know how to solve it.
Well:
- the switchboard is located next to the central console on the passenger side. There is such a plastic cover on the side. The switchboard is located between it and the console.
- after removing it from this place and placing it on a rug or hanging it on a carpet that enters the plastic surrounding the console, the problem disappears.
- I decided that the reason must be some electromagnetic field, which may affect the cables or the control unit itself. A field generated by some device in the console. Radio? Climate? On-board computer?
- I decided to remedy it, I bought a piece of thick rubber, she wrapped the control unit several times with aluminum foil and something changed. Every day I keep my car in the garage next to the apartment I live in. I start the car, the system works ok. I can drive around the garage at will and no squeaking. All I have to do is get close to the garage door and the system goes crazy. As if not only the car itself generated disturbances, the garage or the moment of leaving it.
- the problem disappears when I leave the garage, turn off the car and start it again. This is not a solution because the battery and the starter
- I decided to change the insulation material, I bought a tape that is used to make such mattress inserts to hide from electrosmog. The effect is the same as with the foil.
I know that I could move this switch to another place, but it's a lot of work, and secondly, it tires me.
The question is how to effectively block this field, if it is a field?
How to protect the control unit against its accumulation, because it looks like a charge accumulates overnight, which disappears after restarting the car.
When, for example, a car is standing in the open air for several hours, the problem does not occur or occurs sporadically. I noticed that when, for example, there were severe frosts, then the problem intensified. Help.

I have a car, a Subaru Legacy iv. Some time ago I decided to enrich it with parking sensors. Polish manufacturer, sensors front / rear and LED display with info which sensor and what distance. It was set up for me by a garage where the car was going through a tinsmith case.
And I have a problem. The system behaved strange after it was put on. Every now and then it showed that there was an obstacle on one of the sensors at the front. We concluded with the workshop that the sensor was nuts. We exchanged. Same. Well, the suspicions fell on the switchboard. The store replaced with a new one. Same.
Disconnecting the cable from the ill-fated sensor causes the symptom to move to the sensor next to it.
After x different combinations, I think I know what the problem is, but I don't know how to solve it.
Well:
- the switchboard is located next to the central console on the passenger side. There is such a plastic cover on the side. The switchboard is located between it and the console.
- after removing it from this place and placing it on a rug or hanging it on a carpet that enters the plastic surrounding the console, the problem disappears.
- I decided that the reason must be some electromagnetic field, which may affect the cables or the control unit itself. A field generated by some device in the console. Radio? Climate? On-board computer?
- I decided to remedy it, I bought a piece of thick rubber, she wrapped the control unit several times with aluminum foil and something changed. Every day I keep my car in the garage next to the apartment I live in. I start the car, the system works ok. I can drive around the garage at will and no squeaking. All I have to do is get close to the garage door and the system goes crazy. As if not only the car itself generated disturbances, the garage or the moment of leaving it.
- the problem disappears when I leave the garage, turn off the car and start it again. This is not a solution because the battery and the starter
- I decided to change the insulation material, I bought a tape that is used to make such mattress inserts to hide from electrosmog. The effect is the same as with the foil.
I know that I could move this switch to another place, but it's a lot of work, and secondly, it tires me.
The question is how to effectively block this field, if it is a field?
How to protect the control unit against its accumulation, because it looks like a charge accumulates overnight, which disappears after restarting the car.
When, for example, a car is standing in the open air for several hours, the problem does not occur or occurs sporadically. I noticed that when, for example, there were severe frosts, then the problem intensified. Help.