Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B1603-00: CAN Bus OFF: General Description
Body electrical system is consist of 6 Units BCM (Body Control Module), DDM (Drive Door Module), SJB (Smart Junction Box), SMK (Smart Key Control Module), ADM (Assist Door Module) constructing the Body Wiring system is connected to BODY CAN*1 .
*1 CAN (Controller Area Network): CAN is serial bus communication type which links not only communication system but also control units each other.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.