System Outline

System Operation 

If the ignition SW is turned to ON, the current from the HEATER fuse is sent to the coil side and the FAN relay is turned to ON. Then the current flows to TERMINAL +B of the cooling fan ECU. At the same time, the conditions of the A/C SW, A/C dual pressure SW and engine rotation are sent to the TERMINAL S1 as signals from the TERMINAL RFC of the engine control module. As a result of that, the cooling fan ECU continuously controls the rotation of the fan motor and keeps a balance between the cooling efficiency and silentness with the optimal fan rotation.