Kia Soul: Relay Box (Passenger Compartment) Description and Operation - Fuses And Relays - Body Electrical SystemKia Soul: Relay Box (Passenger Compartment) Description and Operation

Kia Soul EV (PS EV) 2015-2020 Service Manual / Body Electrical System / Fuses And Relays / Relay Box (Passenger Compartment) Description and Operation

Description
Smart Junction Box(SJB)
1.
General function : Interior Junction Box + some functions of BCM
It uses CAN communication and IPS to control loads.
2.
Main functions:
Low speed CAN communication (100kbps)
Self diagnosis (Lamp open/short)
Fail safe (When MCU/CAN fail, directly operates head lamp/tail lamp)
Over-voltage protection of bulbs (PWM function)
Over-load and Short cut-off function: PCL (Programmable Current Limit)
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 20 minutes in "sleep" state
 - SJB power down (SJB dark current : 200 ?A) 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 ?A) 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 5s)
 - SJB Powerdown (SJB dark current : 200 ?A) and cutting power of Lamp Load


4.
Problem when mode 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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