Codes P1793 and P1000?

Okay, the car is showing a couple of issues; the battery light comes on a few minutes after turning the car on and stays on while driving, the engine light is on, and the fan stays on the whole time the car is on.
In the past years the fan has replaced it just broke down and the control module has been replaced 2 times. This time the cables that connect the control module to the fan had to be replaced. The mechanic has worked on it and can't find what is causing the fan to be on all the time. His last comment was that the ECU is sending signals that the car is overheating causing the fan to be on, the fan module to burn out, and the battery light to be on. Any ideas about what can be going on? Other than that, the car drives normally.