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.
.
• 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.
.
• 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)]
C
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HAC
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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.
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