Hyundai Kona: Fuses And Relays / Relay Box (Passenger Compartment) Description and operation

Hyundai Kona (OS) 2018-2020 Service Manual / Body Electrical System / Fuses And Relays / Relay Box (Passenger Compartment) Description and operation

Description
Auto Cut System of Dark Current

Abbreviation
Expalnation
ACU
Airbag Control Unit
ADM
Assist Door Module
B_CAN
Body Controller Area Network
BCM
Body Control Module
BCW
Blind-Spot Collision Warning Indicator
C_CAN
Chassis Controller Area Network
CLU
Cluster Module
DATC
Dual Automatic Temp Control
DDM
Driver Door Module
ESC
Electronic Stability Program
EMS
Engine Management System
LKA
Lane Keeping Assist
M_CAN
Multi media Controller Area Network
MDPS
Motor Driven Power Steering
P_CAN
Powertrain Controller Area Network
PSM
Power Seat Module
SAS
Steering Angle Sensor
SJB
Smart Junction Block
SMK
Smart Key Unit
PAS
Parking Assist System
TCU
Transmission Control Unit
TPMS
Tire Pressure Monitoring System
VDC
Vehicle Dynamic Control
TMU
Telematics System
ABS
Anti-lock Brake System
SCC
Smart Cruise Control

Smart Junction Block (SJB)
General function : Interior Junction Block + some functions of BCM
It controls loads with CAN communication and IPS.

IPS stands for Intelligent Power Switch, which uses the semiconductor technology to replace the current role of fuse and relay. (The IPS device protects the current load control function from the overcurrent.)

  
The advantages of IPS are as follows:
Reduce relay and consequently decrease weight and volume
Remove the relay operation noise
Not necessary to replace fuse, increasing the product life
Diagnosis capability
SJB control entry
1.
Switch signal input
(1)
Assist seat belt switch
Assist the door switch
Driver's seat belt switch
Rear left door switch
Rear right door switch
IGN1 switch
IGN2 switch
Brake fluid sensor
Trunk lid handle switch
HID head lamp option
Hazard lamp switch
Head lamp low beams switch
Hood switch
Left front / rear turn signal switch
Right front / rear turn signal switch
Parking brake switch
Driver the door lock/unlock control status
Assist the door lock/unlock control status
Rear left the door lock/unlock status
Rear right the door lock/unlock status
Driver the door switch
Driver the door key lock switch
Driver the door key unlock switch
Driver the door power window lock switch
Driver the door power window unlock switch
(2)
IPS&ARISU
Left Head lamp low beams
Right Head lamp low beams
Left Head lamp high beams
Right Head lamp high beams
Room lamp
Exterior left tail lamp
Exterior right tail lamp
Left front / rear turn signals
Right front / rear turn signals
DRL left lamp
DRL right lamp
Body resistance cut control
Front left turn signal output
Front right turn signal output
(3)
Relay Control
Rear glass heater relay
Trunk lid relay
Front glass heater relay
Head lamp high beams relay
Memory fuse switch relay
Door lock/unlock relay
Power window wake-up relay
2 Turn door lock relay
2.
SJB protection
(1)
PCL (Programmable Current Limit) functions
Replace the current junction box fuse function to protect the wire.
How to operate : If the lamp current exceeds the standard level, cut off the lamp current to protect lamp.
Lamp cut off time : 300ms or less.
Applied load : Applied to all lamp loads controlled by SJB.
Output the error code according to the error detection conditions.
(2)
OCL (Open Current Limit)
Detect the lamp open state and inform the user of it.
How to operate: Detect the current of the lamp and if it is below the standard level, change the lamp operation.
Applied load: Applied to the turn signal lamp 4 channel
Output the error code according to the error detection conditions.
3.
SJB fail safe function
(1)
When SJB has a failed MCU (not operating due to a physical or electrical shock from the outside), the head lamp low and exterior and interior tail lamp are turned on to secure the driver if IGN2 is on and the head lamp low switch is on.
(2)
When the data transmission/reception fails due to a failed CAN communication line connected with SJB module (disconnection of both high and low line, high/low BAT short, high/low GND short), the head lamp low and interior/exterior tail lamps are turned on if IGN2 is on and the head lamp low switch is on.
4.
Auto Cut System of Dark Current
(1)
Description : It cuts automatically power to be provided with load for reducing useless dark current according to vehicle state.

(2)
SJB had 3 modes, "Normal Mode", "Sleep Mode", "Power Off Mode". Auto cut of dark current practice in "Sleep Mode".
"Sleep" condition : IG OFF, constant input switch, CAN network doesn't activate.
"Sleep" resolutive condition : Any switch inputs, CAN network activates, KEY ON, IGN ON
"Power OFF" condition : The setting time of timer which is used by cutting a load power expires.
"Normal Mode" : SJB function normally activates.
"Sleep Mode" : It is low power mode and activates for reducing electricity consumption of SJB or IPM. Auto cut of dark current function activates.
"Power OFF Mode" : Power of MCU and circumferential circuit is cut for minimizing electricity consumption. Operation stops.
(3)
The explanation - The auto cut of dark current

Before delivering to customer
Fuse switch OFF
All door close & RKE door lock or Constant switch state
(Auto cut of dark current scenario starts.)
After "sleep" state is for 5 min.
SJB power down(SJB dark current : 200 μA) and cutting power of Lamp
/Multimedia Load/Wake up/Immobilzer


After delivering to customer
Fuse switch ON
All door close & Constant switch state : C_BAState=OFF
(Auto cut of dark current scenario starts.)
After "sleep" state is for 20 min.
In case RKE door lock : C_BAState=ON & Trunk SW=CLOSE
(Auto cut of dark current scenario starts.)
After "Sleep" state 35s-65s (Waiting time of other unit : 30-60s + SJB
sleep counts 5s)


(4)
Problem when fuse switch setting is wrong
: If a fuse switch is set to OFF(Before delivering to customer) by a customer or technician and auto cut function of dark current activates, below problems may happen.
Symptom
Related part
Door lock/unlock, trunk open don't activate by RKE.
(Wakeup of each module don't activate.)
BCM
Digital clock is reset.(Memory is reset.)
Digital clock
Setting value of audio(Volume, Frequency setting) is reset.
(Memory is reset.)
Audio

* If fuse switch OFF (before delivering to customer) is set, power of BCM, Digital clock and audio is shut off.
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