EV SYSTEM START UP CONTROL: System Description: Ready

Fig 1: EV System Start Up Control System Diagram - Ready

Courtesy of NISSAN NORTH AMERICA, INC.

When the driver operates the POWER switch while depressing the brake pedal, VCM turns ON the M/C relay to supply power to each ECU in the EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

NOTE: VCM inhibits the vehicle is set to READY in following conditions:

Charge connector is connected
Li-ion battery remaining energy is too low.
Li-ion battery temperature is too low. [Approximately -25°C (-13°F)]

In Normal Charging

Fig 2: EV System Start Up Control System Diagram - In Normal Charging

Courtesy of NISSAN NORTH AMERICA, INC.

If VCM judges that the system is in normal charge mode, VCM turns ON the M/C relay to supply power to each ECU in the EV system and to the normal charge relay in the DC/DC junction box. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

NOTE: Normal charging does not start with the power switch ON.

In Quick Charging

Fig 3: EV System Start Up Control System Diagram - In Quick Charging

Courtesy of NISSAN NORTH AMERICA, INC.

When VCM judges that the system is in quick charge mode, VCM turns ON the M/C relay to supply power to each ECU in the EV system. VCM also activates the F/S CHG relay to supply power to the quick charge relay inside DC/DC J/B. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

When Air Conditioner Is Operating (Power OFF)

When VCM receives an air conditioner operation command, VCM turns ON the M/C relay to start the EV system. VCM also activates the A/C relay to supply power to the air conditioner system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

When Automatic 12V Battery Charge Control is Operating

When VCM judges that the 12V battery requires automatic charging, VCM turns ON the M/C relay to start the EV system. Furthermore, VCM activates the F/S relay to start the power supply to the system main relay.

Relay Activation Matrix

POWER ON

Relay	Condition
	POWER ON	READY	Charging		When 12V battery is charged	Timer A/C
	POWER ON	READY	Normal charge	Quick charge	When 12V battery is charged	Timer A/C
F/S relay	OFF	ON	ON	ON	ON	ON
M/C relay	ON	ON	ON	ON	ON	ON
A/C relay	ON	ON	ON	ON	ON	ON
F/S CHG relay	OFF	OFF	OFF	ON	OFF	OFF

POWER OFF

Relay

Condition

Charging

When 12V battery is charged

Timer A/C

Remote A/C

Normal charge

Quick charge

F/S relay

M/C relay

A/C relay

OFF

F/S CHG relay

OFF

ON⁽¹⁾

⁽¹⁾	Only during quick charging