Auxiliary Fan K-Bus Interface
Auxiliary Fan
The auxiliary fan stage (speed) is determined from the refrigerant pressure sensor signal.
The IHKS signals the ECM via the K-bus, and the ECM will activate the auxiliary fan.
The fan stage (speed) is generally set to 0 at vehicle speeds above 50 mph (ram air)
K-bus Interface
This interface transmits data such as the vehicle speed, engine speed and diagnosis between the IHKS control unit and the IKE.
The K-bus is also used to transmit compressor load values as well as auxiliary fan request from the IHKS through the IKE then over the can line to the ECM.