Description
Smart Junction Box(SJB)
|
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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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.
|
| B. |
"Sleep" resolutive condition : Any switch
inputs, CAN network activates, KEY ON, IGN ON
|
| C. |
"Power OFF" condition : The setting time
of timer which is used by cutting a load power expires.
|
| 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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|
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3. |
The explanation - The auto cut of dark current
Before delivering to customer
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Fuse switch OFF
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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
|
|
After delivering to customer
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Fuse switch ON
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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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|
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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
|
•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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