Kia Cee'd: Fuses and Relays / Relay Box (Passenger Compartment) Description and operation

Kia Cee'd 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 controls loads with CAN communication and IPS.
2.
Main function
Low speed CAN communication(100 kbps)
Self diagnostics(Lamp open/short)
Fail safe(When MCU/CAN is fail, Head lamp / Tail lamp directly drive)
Protection of bulb over-voltage(PWM function)
Cut of Over-load and Short : PCL(Program Current Limit)
Function
1.
Door Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

2.
Door Lock/Unlock Relay
The SJB receives commands from the BCM, operating the Door Lock/Unlock relay.

3.
Door Unlock State
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

4.
Door Key Lock/Unlock Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

5.
Power Window Relay
The SJB receives commands from the BCM, operating the Power Window relay.

6.
Rear Window Deicer Relay & Front Window Deicer Relay
The SJB receives commands from the BCM, operating the Rear Window Deicer Relay & Front Window Deicer relay.

7.
Driver Seat Belt Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

8.
Tail Gate Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules(BCM,CLU). SJB send CAN message of Tailgate Status to SMK.

9.
Hood Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

10.
Lamp
The SJB receives commands from the BCM, operating the each lamp according to those.

11.
Lamp State
After judging a state of each lamp, the SJB sends CAN messages to other modules.

12.
Hazard and Turn Signal Lamp
An Operating Condition : When the key box is ON or operating. (IGN1 or IGN2)
While the Turn Signal Lamps are operated, if more than 1 load is at Open Load or Short to GND state, double blinking would be performed.
While the Hazard Lamps are operated, if more than 3 load is at Open Load or Short to GND state, double blinking would be performed.
Double Blinking : That means blinking is operated twice faster than normal operating.
When the state of Hazard and Turn Signal Lamp are over current or short, all relevant load output of its side is OFF.

13.
Shift Lever ‘R’Signal Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

14.
Brake Fluid/Park Break Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

15.
Fuse Switch
After judging the position of the contact switch, the SJB sends CAN messages to other modules.

16.
Tail Gate Release Relay
The SJB receives commands from the BCM, operating the Tail Gate Actuator.

17.
Burglar Horn Relay
The SJB receives commands from the BCM, operating the Burglar Horn.

18.
Rear Wiper Relay
The SJB receives commands from the BCM, operating the Rear Wiper.

19.
Mirror Folding/Unfolding Relay
After judging the position of the contact switch or receiving commands from the BCM, the SJB operates the Mirror Folding, Unfolding Relay and sends the Mirror Command Mode Status to the other modules.

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 20 min.
 -SJB power down(SJB dark current : 200 μA) and cutting power of Interior Lamp/Multimedia/Wake up

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.
 -SJB power down(SJB dark current : 200 μA) and cutting power of Interior Lamp Load
•In case RKE door lock : C_BAState=ON & Tail Gate=CLOSE
(Auto cut of dark current scenario starts.)
 -After "Sleep" state 35s~65s (Waiting time of other unit : 30~60s + SJB sleep counts 5s)
 -SJB Powerdown(SJB dark current : 200 μA) and cutting power of Interior 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 activates, below problems may happen.
 
Symptom
Related part
•Door lock/unlock, tailgate 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.
Relay Box (Passenger Compartment) Components and components location
Components ...

Relay Box (Passenger Compartment) Repair procedures
Fuse Inspection 1. Be sure there is no play in the fuse holders, and that the fuses are held securely. 2. Be sure the fuse capaciti ...

Other information:

Kia Cee'd Owners Manual: Use high quality ethylene glycol coolant
Your vehicle is delivered with high quality ethylene glycol coolant in the cooling system. It is the only type of coolant that should be used because it helps prevent corrosion in the cooling system, lubricates the water pump and prevents freezing. Be sure to replace or replenish your ...

Kia Cee'd Service Manual: Specifications
Specification   Item Type Watt (W) Head lamp Low H7 55 D1S 35 High H7 55 Smart Cornering ...

© 2017-2018 www.kceed.com