Kia Optima: Description

BCM, SJB(Smart Junction Box) and CLU(Instrument Cluster) are connected by CAN line.
The nearest module with input switch or actuator receives the input data to reduce the wiring and then send input data to the others which need them via CAN lines.In case of sending output, it is used to CAN communication, not wiring.
SJB can also control relays and IPS.So Each module allots the current data and actuation data.

FunctionRemoval
1.
Turn the ignition switch OFF and disconnect the battery
negative (-) cable.
2.
Disconnect the manifold absolute pressure sensor
connector (A).
...
Removal
1.
Disconnect the battery negative
cable and wait for at least 3 minutes before beginning work.
2.
Remove the roof trim. (Refer
to the Body group- Interior)
...
Disassembly
If the disassembly procedure is complex, requiring many parts to be disassembled,
all parts should be disassembled in a way that will not affect their performance
or external appearance.
1.
...