The cooling fan module is located at the back of the radiator, just in front of the engine. It is controlled by the Powertrain Control Module (PCM) through the inputs connected to it.
These inputs determine the temperature of the coolant, engine and intake air, the air conditioning pressure, as well as the speed of the car. When the DTC code P0483 OBDII is set, it is because the inputs do not match the normal operating voltages that are stored in the computer memory. It is also set if the operation of the cooling fan does not match the default information in the PCM.