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Kia Sedona: Relay Box (Passenger Compartment) Description and Operation - Fuses And Relays - Body Electrical System - Kia Sedona YP Service ManualKia Sedona: Relay Box (Passenger Compartment) Description and Operation

Third generation YP (2014-2025) / Kia Sedona YP Service Manual / Body Electrical System / Fuses And Relays / Relay Box (Passenger Compartment) Description and Operation

Description
Auto Cut System Of Dark Current

Abbreviation
Explanation
ACU
Airbag Control Unit
ADM
Assist Door Module
B_CAN
Body Controller Area Network
BCM
Body Control Module
BSD
Blind Spot Detection
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
LDWS
Lane Departure Warning System
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
SPAS
Smart 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 uses CAN communication and IPS to control loads.

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

   
The advantages of IPS are as follows:
–
Reduces the number of relays and consequently decreases weight and volume
–
Eliminates the relay operation noise.
–
Eliminates the necessity to replace fuses, increasing the product lifetime
–
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 open switch
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
Anti-theft alarm horn 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
Anti-theft alarm 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 low head lamps and exterior and interior tail lamps are turned on to inform the driver that the IGN2 is on and that the low head lamp 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: A system that automatically cuts off the power supplied to the load in order to reduce unnecessary consumption of dark current according to vehicle state.

(2)
SJB has 3 modes, "Normal Mode", "Sleep Mode" and "Power Off Mode". Auto cut of dark current operates in "Sleep Mode".
–
"Sleep" condition : IG OFF, constant input switch, CAN network not activating
–
"Sleep" resolutive condition : Any switch inputs, CAN network activating, KEY ON, IGN ON
–
"Power OFF" condition : When preset time expires on the timer used to cut load power
–
"Normal Mode" : SJB function normally activates.
–
"Sleep Mode" : This low power mode activates to reduce electricity consumption of SJB or IPM. Auto cut of dark current function activates.
–
"Power OFF Mode" : Power to MCU and circumferential circuit is cut off to minimize electricity consumption. Operation stops.
(3)
The explanation - The auto cut of dark current

Before delivering to customer
Fuse switch OFF
•
All doors closed & RKE door locked or Constant switch state
(Auto cut of dark current scenario starts.)
–
After 5 minutes in "sleep" state
–
SJB power down (SJB dark current :200 μA) and cutting power of Lamp/Body Load/Wake up


After delivering to customer
Fuse switch ON
•
All doors closed & Constant switch state : C_BAState=OFF
(Auto cut of dark current scenario starts.)
–
After 20 minutes in "sleep" state
–
SJB power down (SJB dark current : 200 μA) and cutting power of Lamp Load
•
In case of locked RKE : C_BAState=ON & Trunk SW=CLOSE
(Auto cut of dark current scenario starts.)
–
After 35s - 65s in "Sleep" state (Waiting time of other unit : 30s - 60s + SJB sleep counts 5 min)
–
SJB Powerdown (SJB dark current : 200 μA) and cutting power of Lamp Load


(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 is activated, the following problems may happen.
Symptom
Related part
•
Door lock/unlock, trunk open don''t activate by RKE.
(Wakeup for each module doesn''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 is set to OFF (before delivering to customer), the power to BCM, Digital clock and audio is shut off.
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