Greetings,
The vehicle is a Citroen c4 Grand Picasso petrol engine 165 thp.
I purchased the vehicle about a month ago and since then I have not driven it because it required alignment.
I disconnected a battery through the quick connection of the plus to save the battery. After about a week, I connect a battery and the vehicle "goes crazy". Multimedia system turns on and off, a million red errors of gear, engine and many other systems.
In addition, it is shown on the upper screen that the system switches to energy saving mode and therefore the multimedia display is turned off even though, as mentioned, the battery is in perfect condition.
The vehicle does not move and there is no starter noise either.
The first suspicion, of course, is a weak battery, it is still under warranty, tested and working.
In troubleshooting I got 3 lines with the same code - u0100 lost connection
.
After researching the issue, I thought maybe there was a bsi problem, I did a reset several times according to this guide
https://www.frenchcarforum.co.uk/forum/ ... 51&t=61997
But I saw no change.
I disconnected the engine computer to understand if it is disrupting the system but the situation remains exactly the same. Which strengthens the assumption that the problem is with the bsi computer.
I can bring a computer from disassembly, the question is which garage can do coding?
Is this the only solution?
Link to the video of the problem
Thanks for the help