Kia 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

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

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.

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.

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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