General Information

Smart Key Unit
B1603 CAN Bus Off - General Information

Component Inspection





General Description

Body electrical system is consist of 3 Units BCM(Body Control Module), SMK(Smart Key Control Module), SJB(Smart Junction Box) constructing the Body Wiring system is connected to BODY CAN*.
* CAN (Controller Area Network): CAN is serial bus communication type which links not only communication system but also control units each other.






DTC Description

No CAN communication status.
Case1: CAN High and Low, short to battery together.
Case2: CAN High and Low, short to ground together.
This code reports BUS OFF status and it is necessary to verify the status of CAN communication line.
Difference between CAN error(B1602) and CAN BUS error(B1603)
CAN Error : MIL On, CAN Bus Error : No MIL when Hazard On

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data