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# Kia Soul EV: Fuses And Relays / 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.

##### Relay Box (Passenger Compartment) Components and Components Location

Component Location ...

##### Relay Box (Passenger Compartment) Repair procedures

Fuse Inspection 1. Be sure that there are no loose fuse holders and that the fuses are held securely. 2. Is the fuse capacity correct for each circuit? 3. Are there any blown fuses? If a ...

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