Nissan Leaf. Manual - part 759

SYSTEM

HAC-39

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

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• When the operation time calculated by the A/C auto amp. is reached, VCM transmits a wake up request sig-

nal to the A/C auto amp. via EV CAN communication. Then, A/C auto amp. activates and the A/C is oper-

ated.

A/C OPERATION DURING A/C-HEATER TIMER

• During A/C-Heater Timer, the A/C auto amp. operates the A/C under the following conditions.

*:For outlet switching during heating, D/F operates for 10 minutes and DEF for 5 minutes. One cycle is 15

minutes.

• If the charge plug is not connected to the charge port when A/C-Heater Timer starts, A/C-Heater Timer oper-

ation does not start. Also, if the charge plug is disconnected during A/C-Heater Timer operation, A/C-Heater

Timer operation stops.

• Use CONSULT to change the setting of whether the electric compressor operates when the outlet is in DEF.

Refer to 

HAC-47, "CONSULT Function"

.

• During A/C-Heater Timer operation, HEAT switch indicator lamp (during heating) or A/C switch indicator

lamp (during cooling) turns ON depending on the A/C operation status.

• During A/C-Heater Timer operation, the air conditioner cannot be operated by A/C controller. Also, when any

A/C control switch is pressed, A/C control switch indicator lamp blinks.

AUTOMATIC AIR CONDITIONING SYSTEM : Remote Climate Control

INFOID:0000000010121763

DESCRIPTION

• When the user selects the remote climate control, TCU transmits a remote climate control request signal to

VCM. By transmitting the remote climate control request signal, VCM activates A/C auto amp. A/C auto

amp. then performs remote climate control.

• When the timer/remote A/C temperature is set on the navigation screen, the timer/remote setting tempera-

ture signal (timer/remote A/C temperature set on the navigation screen) is transmitted from VCM via CAN

communication. VCM then transfers the signal to A/C auto amp. via EV CAN communication. Then, the set-

ting temperature is stored in A/C auto amp.

• A/C auto amp. controls the air conditioner using the stored setting temperature as the remote climate control

setting temperature.

• VCM ends remote A/C when it judges remote A/C completion.

A/C OPERATION STATUS DURING REMOTE CLIMATE CONTROL

• During remote climate control, the A/C auto amp. operates the A/C under the following conditions.

JSIIA1776GB

Intake

Outlet*

Electric com-

pressor

PTC heater

Seat heater 

relay

Steering heater

Operation time of A/

C-Heater Timer

• Other than 

heater 
DEF: REC

• For heater 

DEF: FRE

• During heating:

D/F (10 minutes) 
⇔ DEF (5 minutes)

• During cooling: 

AUTO

Maximum of 

3500 rpm

Same as 

same as nor-

mal opera-

tion

ON

When the temperature 

detected by the ambient 

sensor is 10°C or less, 

15 minutes are passed 
since start of timer A/C 

operation ON

Maximum of 2 hours 

(operation time is 
determined using 

the ambient temper-

ature.)

HAC-40

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

SYSTEM

*:For outlet switching during heating, D/F operates for 10 minutes and DEF for 5 minutes. One cycle is 15

minutes.

• Use CONSULT to change the setting of whether the electric compressor operates when the outlet is in DEF.

Refer to 

HAC-47, "CONSULT Function"

.

• During remote climate control operation, HEAT switch indicator lamp (during heating) or A/C switch indicator

lamp (during cooling) turns ON depending on the A/C operation status.

• During remote climate control operation, the air conditioner cannot be operated by A/C control. Also, when

any A/C control switch is pressed, A/C control switch indicator lamp blinks.

AUTOMATIC AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset

INFOID:0000000010121764

A step motor is used for the mode door motor and air mix door motor.

Because the step motors do not have position detection mechanisms, there may be a deviation between the

door position recognized by the A/C auto amp. and the actual door position. Therefore, the A/C auto amp. per-

forms motor zero position reset in order to align its recognized door position with the actual door position.

When either of the conditions below is satisfied, the A/C auto amp. performs motor zero position reset when

the power switch turns ON or when A/C-Heater Timer (Climate Ctrl. Timer) turns ON.

• The 12V battery terminal is disconnected and then is reconnected.

• The power switch is turned OFF during operation of the mode door motor or air mix door motor a total of 60

times.

During zero position reset operation, the DEF switch indicator flashes for several seconds. No switch opera-

tions are accepted during this time.

AUTOMATIC AIR CONDITIONING SYSTEM : Fail-safe

INFOID:0000000010121766

• When the A/C auto amp. detects the conditions shown below, it stops operation of the electric compressor.

• When the electric compressor detects the following conditions, electric compressor operation is restricted.

Intake

Outlet*

Electric com-

pressor

PTC heater

Seat heater 

relay

Steering heater

Operation time of re-

mote climate control

• Other than 

heater 
DEF: REC

• For heater 

DEF: FRE

• During heating:

D/F (10 minutes) 
⇔ DEF (5 minutes)

• During cooling: 

AUTO

Maximum of 

3500 rpm

Same as 

same as nor-

mal opera-

tion

ON

When the temperature 

detected by the ambient 

sensor is 10°C or less, 

15 minutes are passed 
since start of timer A/C 

operation ON

Maximum of 2 hours 

(operation time is 
determined using 

the ambient temper-

ature.)

Malfunction judgment item

Description

Recovery condition

Intake sensor malfunction

Open circuit or short circuit is detected in the in-
take sensor circuit.

Voltage value of intake sensor circuit re-
turns to normal.

Ambient sensor malfunction

Open circuit or short circuit is detected in the am-
bient sensor circuit.

Voltage value of ambient sensor circuit 
returns to normal.

Malfunction judgment item

Description

Electric com-

pressor opera-

tion

Recovery condition

Compressor low voltage mal-
function

When the high voltage system input voltage is 
less than 230 V.

Stopped

High voltage system input volt-
age is 230 V or more.

Compressor high voltage 
malfunction

When the high voltage system input voltage is 
more than 420 V.

Stopped

High voltage system input volt-
age is 420 V or less.

Compressor internal commu-
nication malfunction

When a malfunction is detected in AC inverter in-
ternal communication.

Stopped

Internal communication returns 
to normal.

Compressor low voltage sys-
tem malfunction

Voltage of battery power supply input to electric 
compressor is 9 V or less or 17 V or more.

Stopped

Voltage of battery power sup-
ply input to electric compressor 
is more than 9 V or less than 17 
V.

Compressor internal commu-
nication malfunction

When overcurrent is detected in inverter.

Stopped

Power switch OFF.

SYSTEM

HAC-41

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

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• When the PTC heater detects the following conditions, PTC heater operation is stopped.

• A/C auto amp. stops the electric compressor operation, when the following condition detections is received

from a heat pump control unit.

Compressor internal commu-
nication malfunction

When open circuit is detected in inverter.

Stopped

Power switch OFF.

Compressor current sensor 
malfunction

When inverter is OFF, the detected current value 
in inverter is the standard value or more.

Stopped

Power switch OFF.

Compressor overload

When the high load status at low speed of electric 
compressor is continued.

Stopped

Power switch OFF.

Compressor overheat

When the inverter temperature exceeds the stan-
dard value.

Stopped

Inverter temperature is the 
standard value or less.

Compressor system malfunc-
tion

When the internal system malfunction stop oc-
curs repeatedly.

Stopped

Power switch OFF.

Compressor high voltage sys-
tem malfunction

When the standard value voltage is input to AC 
inverter.

Stopped

Power switch OFF.

Compressor communication 
malfunction HVAC 

→ COMP

When the electric compressor cannot receive the 
signal transmitted from the A/C auto amp.

Stopped

LIN communication returns to 
normal.

Compressor internal system 
malfunction

When a malfunction is detected in the CPU, ROM 
or RAM of the inverter.

Stopped

Power switch OFF.

Compressor HVIL circuit mal-
function

When HVIL open circuit is detected in electric 
compressor system.

Stopped

HVIL circuit in electric com-
pressor system returns to nor-
mal.

Compressor communication 
malfunction COMP 

→ HVAC

When the A/C auto amp cannot receive the signal 
transmitted from the electric compressor.

Stopped

LIN communication returns to 
normal.

Compressor voltage limit

When the command speed control is disabled 
due to voltage decrease of high voltage system.

Compressor 
speed is limited.

Voltage of high voltage system 
returns to normal.

Compressor motor current 
limit

When the command speed control is disabled 
due to decrease of motor upper limit.

Compressor 
speed is limited.

Motor current returns to nor-
mal.

Compressor overheat

When the inverter temperature exceeds the stan-
dard value.

Compressor 
speed is limited.

Inverter temperature is the 
standard value or less.

Malfunction judgment item

Description

Recovery condition

PTC heater overheat protection

When PTC heater circuit board internal temperature is 115

°C 

or higher.

PTC heater circuit board internal 
temperature is less than 115

°C.

PTC heater voltage malfunction

When supply voltage input to PTC heater is out of the stan-
dard.

Supply voltage input to PTC heat-
er returns to within the standard.

PTC heater circuit 1 malfunction

When PTC heater circuit (PTC1) system malfunction is de-
tected.

Power switch OFF.

PTC heater circuit 2 malfunction

When PTC heater circuit (PTC2) system malfunction is de-
tected.

Power switch OFF.

PTC heater LIN communication 
malfunction

When there is a malfunction in the signal transmitted from the 
PTC heater.

LIN communication returns to nor-
mal.

PTC heater communication mal-
function

When there is a malfunction in the signal transmitted from the 
A/C auto amp. or in the signal received by the PTC heater.

LIN communication returns to nor-
mal.

HVAC LIN communication mal-
function

When there is a malfunction in the signal transmitted from the 
A/C auto amp.

LIN communication returns to nor-
mal.

Malfunction judgment item

Description

Electric com-

pressor opera-

tion

Recovery condition

HAC-42

< SYSTEM DESCRIPTION >

[AUTO A/C (WITH HEAT PUMP)]

SYSTEM

Malfunction judgment item

Description

Recovery condition

A/C auto amp. LIN communica-
tion malfunction

When there is a malfunction in the signal transmitted from the 
heat pump control unit.

LIN communication returns to nor-
mal.

Compressor discharge refriger-
ant temperature sensor malfunc-
tion

Open circuit or short circuit is detected in the compressor dis-
charge refrigerant temperature sensor circuit.

Voltage value of compressor dis-
charge refrigerant temperature 
sensor circuit returns to normal.

Compressor suction refrigerant 
temperature sensor malfunction

Open circuit or short circuit is detected in the compressor suc-
tion refrigerant temperature sensor circuit.

Voltage value of compressor suc-
tion refrigerant temperature sen-
sor circuit returns to normal.

Refrigerant channel switching 2 
way type valve circuit malfunc-
tion

When the heat pump control unit detects a malfunction of the 
refrigerant channel switching 2 way type valve control signal 
status, compared to the valve status of the control that is being 
judged.

Power switch OFF.

Refrigerant channel switching 3 
way type valve circuit malfunc-
tion

When the heat pump control unit detects a malfunction of the 
refrigerant channel switching 3 way type valve control signal 
status, compared to the valve status of the control that is being 
judged.

Power switch OFF.