So i just replaced the battery in my key fob (my mom said that somehow thats what is affecting the car) but today my mom drove the car and when she came home she said there was a ton of messages on the car and the trunk wouldnt open, I went to go check and my trunk wont open by any means( i even tried through the emergency button through the inside of my car) and it will still not open. I then went inside the car and got a active brake assist function limited message and a blind spot assist malfunction message and to top it off my rear camera will no longer turn on. I checked and there are no physical obstructions on the sensors. has anyone come upon a problem like this? This car has never done anything like this before and i cant find anything online about it

 

The warning lights and non-functioning trunk have nothing to do with changing a key fob battery. How old is the 12V battery in the car? What year and model is the car?