Hi friends, no one has written anything. After 1 week of research, I solved the problem by listening to the vehicle with my own efforts. First, the malfunction indicator light comes on every time I start it, no matter what I do. I tested these. For example, the first day I started the car, I pressed the brake pedal, the light came on immediately, and the next day I started it in the morning, this time I didn't press the brake, it came on again, and this time it comes on after 10-15 seconds after the car starts. The ESP light only comes on, saying to have the car repaired, and only the Cruz control doesn't work. Anyway, I tried things like that. Also, there's this: if it comes on when the car first starts, it doesn't come on anymore. A lot of things came to my mind, for example, the car's battery, but I reset the battery 3 months ago, I installed a new battery, I eliminated that, and last Thursday I tried something else. I turned off the Cruz control without starting the car, and I started it that way, but no problem came, I pressed the brake, no problem, no problem, no problem, I stopped it immediately. This time, I started the Cruz, I started it, I pressed the brake, and the light came on, oh well, that's where I noticed a sign in my head. Anyway, I drove around until evening that day, came home with the car, I did a lot of research. There are many people who have had this problem. While I was looking at other sites and forums, I spent 5-6 hours in front of the computer. A guy from a foreign site shared a diagram related to the ESP circuit related to the electrical installation based on the chassis number of my vehicle. As I am an electrical technician myself, I examined it for 2-3 hours. There I saw an explanation that the vehicle's brake switch was directly integrated with the ESP system. Since it had a double contact, it led me to measure that part. However, my brake lights were already working normally. The problem arose precisely here. The vehicle uses a brake switch with two separate contacts. One of them turns on the lights while the other sends a signal to the ABS ESP system. When this contact fails, the vehicle turns on the ESP light. Anyway, as soon as I woke up in the morning, I went to the garage with my measuring device, removed the switch, and measured it. Indeed, one of them has a slight problem. One of them works normally. By the way, the electrical diagram shows that this situation will also affect the Cruze control. This way, I realized that there is no problem with the Cruze control. I started the vehicle, the light did not come on because the Cruze was off, and it completely confused me. The problem was completely gone. I bought the original product from a place that sells original parts. I bought it for around 600 liras and immediately went home and changed it in the garage and since then no matter what I did the ESP light did not malfunction and everything returned to normal in the car. I drove 300-400 km today and everything is normal. As you can see, I was going to take the car to the authorized service and have it connected to the device. Thank God, this issue is closed, I hope there are others who have the same problem and want to try it, I hope you find it useful. Stay well.
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