What is an Electronic Control Unit?
An electronic control unit (ECU) is an embedded system in vehicle electronics that is responsible for controlling a specific function.
A vehicle could have + 100 ECUs, controlling functions that range from the essential (such as engine and, steering) to comfort (such as heated seats, and air-conditioning).
An ECU also control the security and access (such as door locks, and keyless entry), and passive (such as airbags), and active safety features (such as automatic emergency braking).