Nissan Leaf. Manual — part 502
EVC-32
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SIGNAL PATH
• VCM monitors the status of DC/DC converter by receiving a DC/DC converter status signal from PDM
(Power Delivery Module).
• When detecting a malfunction in the DC/DC converter simultaneously with a 12V battery voltage drop, VCM
transmits a 12V battery charge warning lamp request signal to the combination meter for turning on the 12V
battery charge warning lamp.
LIGHTING CONDITION
When any of the following conditions are satisfied:
• Power switch: ON
• When VCM detects a malfunction in the DC/DC converter during the READY state simultaneously with a
12V battery voltage drop (approximately 12.5 V or less) for a few seconds.
NOTE:
• When 12V battery voltage drops sharply while in READY state, the READY state is also cancelled.
• When 12V battery voltage becomes low, the 12V battery charge warning lamp turns ON and the buzzer
sounds if the shift position is not in P position.
SHUTOFF CONDITION
When all of the following conditions are satisfied:
• When 12V battery voltage returns to normal, the 12V battery charge warning lamp turns OFF.
• The DC/DC converter operates normally.
TIMING CHART
WARNING/INDICATOR (ON INFORMATION DISPLAY)
WARNING/INDICATOR (ON INFORMATION DISPLAY) : DC/DC Converter Warning
INFOID:0000000010120546
DESIGN/PURPOSE
DC/DC converter warning warns the driver of 12V battery voltage drop.
JSCIA0510GB
COMPONENT PARTS
EVC-33
< SYSTEM DESCRIPTION >
D
E
F
G
H
I
J
K
L
M
A
B
EVC
N
O
P
*1: When 12V battery voltage drops while driving.
*2: When 12V battery voltage drops with the shift position not in P position.
SYNCHRONIZATION WITH MASTER WARNING LAMP
Synchronization is applied.
For master warning lamp, refer to
MWI-31, "MASTER WARNING LAMP : System Description"
SYNCHRONIZATION WITH WARNING CHIME
Synchronization is applied.
For warning chime, refer to
EVC-37, "WARNING CHIME : DC/DC Converter Warning Chime"
.
SYSTEM DIAGRAM
SIGNAL PATH
• VCM monitors 12V battery voltage, and if the voltage drops, then VCM transmits a DC/DC converter warning
request signal to the combination meter to display a DC/DC converter warning.
• When receiving a P range signal from the electric shift selector, VCM cancels a DC/DC converter warning.
WARNING/INDICATOR OPERATING CONDITION
When all of the following conditions are satisfied:
• Shift position: Except P range
• 12V battery voltage stays low (approximately 10 – 12 V or less)
*
for a few consecutive seconds.
*: Threshold voltage depends on vehicle speeds.
NOTE:
When 12V battery voltage drops sharply while in READY state, the READY state is also cancelled.
WARNING/INDICATOR CANCEL CONDITION
When any of the following conditions are satisfied:
• Shift position: P range
• The 12V battery voltage returns to approximately 12.5 V or more.
Symbol
Message
• Stop vehicle
*1
• Apply parking brake
*2
JSCIA0030ZZ
JSCIA0545GB
EVC-34
< SYSTEM DESCRIPTION >
COMPONENT PARTS
TIMING CHART
WARNING/INDICATOR (ON INFORMATION DISPLAY) : Low Battery Charge Warning
INFOID:0000000010120547
DESIGN/PURPOSE
Low battery charge warning is displayed when Li-ion battery power becomes low.
SYNCHRONIZATION WITH MASTER WARNING LAMP
Synchronization is applied.
For master warning lamp, refer to
MWI-31, "MASTER WARNING LAMP : System Description"
.
SYSTEM DIAGRAM
SIGNAL PATH
• LBC transmits a Li-ion battery remaind energy signal to VCM.
JSCIA0542GB
Symbol
Message
—
Battery level is low
JSCIA0511GB
COMPONENT PARTS
EVC-35
< SYSTEM DESCRIPTION >
D
E
F
G
H
I
J
K
L
M
A
B
EVC
N
O
P
• VCM calculates a remaining Li-ion battery power according to a signal received from LBC. When judging low
remaining battery power, VCM transmits a low battery charge warning lamp request signal to the combina-
tion meter.
WARNING/INDICATOR OPERATING CONDITION
When all of the following conditions are satisfied:
• Power switch: ON or READY
• When Li-ion battery power is 4 kWh or less.
WARNING/INDICATOR CANCEL CONDITION
When Li-ion battery power returns to 4.5 kWh or more.
TIMING CHART
Low battery charge warning is displayed in synchronization with the low battery charge warning lamp.
WARNING/INDICATOR (ON INFORMATION DISPLAY) : Power Limitation Warning
INFOID:0000000010120548
DESIGN/PURPOSE
Power limitation warning shows that traction motor output is limited.
SYNCHRONIZATION WITH MASTER WARNING LAMP
Synchronization is applied.
For master warning lamp, refer to
MWI-31, "MASTER WARNING LAMP : System Description"
SYSTEM DIAGRAM
SIGNAL PATH
• The traction motor inverter transmits a motor torque limit signal to VCM when the traction motor needs to be
protected.
JSCIA0512GB
Symbol
Message
—
Motor power is limited
JSCIA0517GB
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