Question

what is the function of Brain box ?​

Answer 1

Explanation:

The brain boxes in most cases are specialized devices focusing on controlling multiple functions in a vehicle e.g. cruise control, automatic gear shifting, climate control, engine running, fuel injection/emission control, collision avoidance, powered mirror, seat & rear mirror controls, etc.

Answer 2

Answer:

The brain box (be it ECU or PCM) performs the following functions; It determines what position the gas pedal is at while idling; It controls the car's transmission, telling it when to switch gears; It controls all the accessories in your vehicle (windows, door-locks, sunroof etc);