DTC B1602-00: CAN Line Error (B-CAN): General Description
WARNING: This page is about a different car, the 2021 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
The Seat Heater & Ventilation control Unit Rear (SHVU RR) uses B-CAN (Body CAN) for optimizing wires and communicates with other units to receive required data and transmit data to other units.