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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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 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
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|
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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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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Fuse Inspection 1. Be sure there is no play in the fuse holders, and that the fuses are held securely. 2. Are the fuse capacities for each circuit correct? 3. Are there any blown fuses? If a fuse is to ...
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