Description
Smart Junction Box(SJB)
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1. |
General function : Interior Junction Box + some functions of BCM
It controls loads with CAN communication and IPS.
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2. |
Main function
| A. |
Low speed CAN communication(100 kbps)
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| B. |
Self diagnostics(Lamp open/short)
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| C. |
Fail safe(When MCU/CAN is fail, Head lamp / Tail lamp
directly drive)
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| D. |
Protection of bulb over-voltage(PWM function)
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| E. |
Cut of Over-load and Short : PCL(Program Current Limit)
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Switch control input
No.
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Switch input
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Value
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Destination
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Wakeup
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1
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IG1
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ON/OFF
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-
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YES
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2
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IG2
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ON/OFF
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-
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NO
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3
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Seat belt switch(Driver)
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BELT/UNBELT
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BCM
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NO
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4
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Seat belt switch(Passenger)
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BELT/UNBELT
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BCM
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NO
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5
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Seat belt switch(Rear left)
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BELT/UNBELT
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BCM
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NO
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6
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Seat belt switch(Rear right)
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BELT/UNBELT
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BCM
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NO
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7
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Seat belt switch(Rear center)
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BELT/UNBELT
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BCM
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NO
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8
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Unlock State(Driver door)
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LOCK/UNLOCK
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BCM,SMK
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YES
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9
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Unlock State(Passenger door)
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LOCK/UNLOCK
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BCM,SMK
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YES
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10
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Unlock State(Rear left door)
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LOCK/UNLOCK
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BCM
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YES
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11
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Unlock State(Rear right door)
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LOCK/UNLOCK
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BCM
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YES
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12
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Driver door switch
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CLOSE/OPEN
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BCM,CLU,SMK
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YES
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13
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Passenger door switch
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CLOSE/OPEN
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BCM,CLU,SMK
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YES
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14
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Rear left door switch
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CLOSE/OPEN
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BCM,CLU,SMK
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YES
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15
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Rear right door switch
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CLOSE/OPEN
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BCM,CLU,SMK
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YES
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16
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Driver/Passenger door Key lock
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OFF/LOCK
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BCM
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YES
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17
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Driver door Key unlock
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OFF/UNLOCK
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BCM
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YES
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18
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Passenger door Key unlock
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OFF/UNLOCK
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BCM
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YES
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19
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Driver window lock switch
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OFF/LOCK
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BCM
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YES
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20
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Driver window unlock switch
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OFF/UNLOCK
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BCM
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YES
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21
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Turn signal switch(Left)
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ON/OFF
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CLU
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NO
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22
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Turn signal switch(right)
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ON/OFF
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CLU
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NO
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23
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Hazard switch
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ON/OFF
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-
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YES
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24
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Trunk switch
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CLOSE/OPEN
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BCM,CLU,SMK
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YES
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25
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HID
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HID/OFF
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-
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NO
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26
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Brake fluid sensor
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ON/OFF
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CLU
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NO
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27
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Parking brake switch
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ON/OFF
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BCM,CLU
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NO
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28
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Multifunction switch(Lighting)
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ON/OFF
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-
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NO
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29
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Hood switch
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OFF/OPEN
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BCM
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YES
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30
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Trunk release switch
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ON/OFF
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BCM,SMK
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YES
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Relay output control
No
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Relay output
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Value
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Type
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Remarks
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1
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Auto cut
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ON/OFF
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Transistor
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Auto cut of Dark current
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2
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Sound relay
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ON/OFF
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Transistor
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3
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Door lock relay
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ON/OFF
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LSD
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4
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Door unlock relay
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ON/OFF
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LSD
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5
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Power window main relay
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ON/OFF
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Transistor
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6
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Rear heater relay
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ON/OFF
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LSD
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7
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Front deicer relay
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ON/OFF
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LSD
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8
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Burglar alarm relay
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ON/OFF
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LSD
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9
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Burglar horn relay
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ON/OFF
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LSD
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10
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T/TURN and D/LOCK
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ON/OFF
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LSD
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11
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Trunk lid relay
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ON/OFF
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Transistor
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Lamp control
No
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Lamp
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Bulb capacity
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PWM control
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PCL detection
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OCL detection
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1
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Head lamp High(Left)
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55 W
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O
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O
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2
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Head lamp Low(Left)
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55 W
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O
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O
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3
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Rear turn signal(Left)
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33 W
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O
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O
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4
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Front turn signal(Left)
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28 W
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O
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O
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5
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Head lamp High(Right)
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55 W
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O
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O
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6
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Head lamp Low(Right)
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55 W
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O
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O
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7
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Rear turn signal(Right)
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33 W
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O
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O
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8
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Front turn signal(Right)
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28 W
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O
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O
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9
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Tail lamp(Left, right)
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72 W
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O
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10
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Interior tail lamp
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60 W
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O
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11
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Front fog lamp(Left, right)
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70W(35W+35W)
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O
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O
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*PCL(Programmable Current Limit) : It detects the current of lamp.
If a current exceed the standard value, it cuts the current of lamp.
*OCL(Open Circuit Limit) : It detects the current of lamp. If
a current is below the standard value, it controls current of lamp.
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Auto cut system of dark current
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1. |
Description : It cuts automatically power to be provided with
load for reducing useless dark current according to vehicle state.
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2. |
SJB had 3 modes, "Normal Mode", "Sleep Mode", "Power Off Mode".
Auto cut of dark current practice in "Sleep Mode".
| A. |
"Sleep" condition : IG OFF, constant input switch, CAN
network doesn't activate.
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| B. |
"Sleep" resolutive condition : Any switch inputs, CAN
network activates, KEY ON, IGN ON
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| C. |
"Power OFF" condition : The setting time of timer which
is used by cutting a load power expires.
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| D. |
"Normal Mode" : SJB function normally activates.
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| E. |
"Sleep Mode" : It is low power mode and activates for
reducing electricity consumption of SJB or IPM. Auto cut of
dark current function activates.
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| F. |
"Power OFF Mode" : Power of MCU and circumferential circuit
is cut for minimizing electricity consumption. Operation stops.
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3. |
The explanation - The auto cut of dark current
Before delivering to customer
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Fuse Switch
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•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 Lamp/Body Load/Wake up
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After delivering to customer
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Fuse Switch
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•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 Lamp Load
•In case RKE door lock : C_BAState=ON & Trunk SW=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 Lamp Load
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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
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Related part
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•Door lock/unlock, trunk open don't activate by RKE.
(Wakeup of each module don't activate.)
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BCM
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•Digital clock is reset.(Memory is reset.)
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Digital clock
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•Setting value of audio(Volume, Frequency setting) is reset.
(Memory is reset.)
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Audio
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*If fuse switch OFF(before delivering to customer) is set, power
of BCM, Digital clock and audio is shut off.
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Hyundai Elantra MD/UD: Relay Box (Passenger Compartment). Description and Operation
