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.

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COMPONENT PARTS

EVC-33

< SYSTEM DESCRIPTION >

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*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

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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.

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Symbol

Message

—

Battery level is low

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COMPONENT PARTS

EVC-35

< SYSTEM DESCRIPTION >

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• 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.

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Symbol

Message

—

Motor power is limited

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