DTC B1603-00: CAN Bus Off: General Description
WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
SHVU FR is a control unit integrating SHM and SVM. SHM controls the heater of the front seats and SVM controls the ventilation motor. And it is connected to ICU to form B-CAN network of the vehicle.