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

Kia Sportage Service & Repair Manual (3rd Generation, SL; 2011-2016) / Body Electrical System / Fuses And Relays / Relay Box (Passenger Compartment): Description and Operation

Description
SJB (Smart Junction Box)
1.
Specification
Item
Requirement
Remark
Rated voltage
DC 12V
?
Voltage range
DC 9 ~ 16V
Normal operating in this range
Storage temperature
-40°C ~ +80°C
?
Operating temperature
-30°C ~ +75°C
?
Operating humidity
85%
PCB, Damp proofing, Coating, etc.
Dark current
Max. 200uA
All Load Open
Operation Voltage Range
DC 9 ~ 16V
 Should activate normally in normal range
Max Use Humidity
85%
Regulated together with parts needing insulation such as PCB, damp-proofing, coating, etc
Insulation Resistance
 Should be no ignition caused by electrical shorts


2.
Rated Burden
Item
Rated Burden
Head Lamp Low LH
55W
Head Lamp Low RH
55W
Head Lamp High LH
60W (Max)
Head Lamp High RH
60W (Max)
Tail Lamp LH
41W(Max)
Tail Lamp RH
31W(Max)
Front Fog Lamp LH+RH
54W
Interior Lamp
45W
B/Alarm Start Relay Coil Control
0.9W
RR FOG Relay Coil Control
0.6W
Tail Gate Latch or Luggage Room Lamp (Power Tail Gate) Relay Coil Control
0.6W
Back Up Relay Coil Control
0.45W
RR Wiper Relay Coil Control (External)
12W (Output Max)
B/Alarm Horn Relay Coil Control (External)
12W (Output Max)
RR.HTD Relay Coil Control (External)
12W (Output Max)
Front Deicer Relay Coil Control (External)
12W (Output Max)

3.
System configuration

?
Division
Form
Description
Input

CAN
Command the lamp and relay control.

Switch
Switch signal input
Output

IPS control
Lamp control through IPS

FET control
Relay control

CAN
–
Transfer the lamp control state
–
Transfer the switch input

4.
System block diagram

No.
1. Power input
No.
2. CAN
1
B+1
1
Tx
2
B+2
2
Rx
3
B+3
?
?
4
IGN1
5
IGN2

No
3. Switch input
1
Driver door switch
16
Rear door unlock state(LH)
2
Assist door switch
17
Rear door unlock state(RH)
3
Rear door switch(LH)
18
Driver seat belt switch
4
Rear door switch(RH)
19
Assist seat belt switch
5
Driver door key unlock switch
20
Rear seat belt switch(LH)
6
Assist door key unlock switch
21
Rear center seat belt switch
7
Driver door key lock switch
22
Rear seat belt switch(RH)
8
Assist door key lock switch
23
Brake fluid switch
9
Hood lock state
24
Parking brake switch
10
Tailgate release switch
25
Hand brake switch
11
Tailgate open switch
26
Shift lever reverse gear
(M/T option)
12
Power window lock switch
27
 -
13
Power window unlock switch
28
Headlamp low switch(M/F)
14
Driver door unlock state
29
HID option
15
Assist door unlock state
30
Wiper parking signal

No
4. IPS output
Power
1
Headlamp low(RH)
B+2
2
Headlamp high(RH)
3
External tail(RH)
4
Internal tail(LH,RH)
5
Dedicated DRL LH/RH
6
Backup lamp
7
Headlamp low(LH)
B+3
8
Headlamp high(LH)
9
Fog lamp(LH,RH)
10
External tail(LH)

No.
5. Internal relay
No.
6. External relay
1
Door lock relay
1
 -
2
Door unlock relay
2
Rear defogger relay
3
Power window relay
3
Front deicer relay
4
Tailgate release relay
4
Burglar horn relay
5
Burglar alarm start relay
5
Rear wiper relay

5.
Control function (Lamp)

–
Smart Junction Box(SJB) controls tail lamp, headlamp(low), headlamp(high) and front fog lamp output. And it diagnoses.
–
It controls lamp after receiving CAN signal from BCM.
–
It sends results of control state and diagnosis to BCM through CAN.
(1)
PWM(Pulse Width Modulation) control : Rated voltage control
If a battery voltage is over 13.2 ± 0.1 V, it controls IPS with PWM and prevents early bulb''s burnt-out and IPS device.
It controls bulbs with controlling IPS.
A frequency is 80 ± 10 Hz(TBD) at controlling with PWM.

? If a voltage is high, a bulb''s life decreases. So, SJB keeps stable voltage to bulbs and ensures bulb''s life.
(2)
PCL : Programmed Current Limit
If current flowed into a wire is larger than basic current which is designated to a wire, it controls IPS with PWM control or stops IPS.

(3)
Overheat diagnosis
If high current flows into SJB within short time like as a ground short, IPS blocks an output and protects wire and load.
6.
Control function - Switch input

? Movement explanation
–
It detects the switch state and transfers to BCM through CAN.
–
It detects the switch state in the sleep state and enables to SJB wakeup function.
7.
Control function - relay

? Movement explanation
–
It receives the power window relay control value from BCM through CAN and controls relays.
–
If C_PwdeMain(CAN signal) is ON, it makes power window relay output to ON.
If C_PwdeMain(CAN signal) is not ON, it makes power window relay output to OFF.
8.
Control function - CAN fail
SJB, in case CAN fail and IGN2 is ON, turns on head lamp(low), external tail lamp and internal tail lamp by force.

9.
Hardware protection function
In case MCU is in the Dead state, SJB checks the headlamp switch state. If IGN2 is ON and headlamp(low) switch is ON, it turns on headlamp(low) by force and protects driver.
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