Nissan GT-R (2007-2014 year). HEATER & AIR CONDITIONING CONTROL SYSTEM. Service Manual — part 3
HAC-2
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
SYSTEM DESCRIPTION
AUTOMATIC AIR CONDITIONER SYSTEM
System Diagram
INFOID:0000000009163969
CONTROL SYSTEM
The control system consists of input sensors, switches, A/C auto amp. (microcomputer) and outputs. The rela-
tionship of these components is as shown in the figure below:
System Description
INFOID:0000000009163970
CONTROL OPERATION
A/C Display
• The status display screen is displayed by pressing the STATUS switch to check the A/C system operating
condition.
• If the A/C operation is performed when any screen other than the status display screen (such as the naviga-
tion system and the audio system) is displayed, the switch operating condition of the used switch is dis-
played on the bottom of the screen. It turns OFF automatically after several seconds.
NNIIA0132GB
JSIIA1049GB
Revision: 2012 November
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AUTOMATIC AIR CONDITIONER SYSTEM
HAC-3
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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Controller (Preset Switch)
MODE Switch
• The “AUTO” on the A/C display turns OFF by pressing the MODE switch from the condition that the AUTO
switch is ON (automatic control).
• The set temperature (driver side and passenger side) and air outlets are displayed on the A/C display by
pressing the MODE switch from the condition that the A/C system is OFF.
• The air outlets may be switched by pressing the MODE switch. Any of VENT, B/L, FOOT, or D/F can be
selected.
VENT
→
B/L
→
FOOT
→
D/F
→
VENT
Temperature Control Dial (Potentio Temperature Control)
• It can select the set temperature of the A/C display at the range of 18.0
°
C (60
°
F) to 32.0
°
C (90
°
F) in incre-
ments of 0.5
°
C (1.0
°
F) freely.
• It increases in increments of 0.5
°
C (1.0
°
F) by turning the temperature control dial clockwise.
• It decreases in increments of 0.5
°
C (1.0
°
F) by turning the temperature control dial counterclockwise.
• The system is set to the LH/RH independent condition (the DUAL switch indicator turns ON) by operating the
temperature control dial (passenger side). It can change the air flow temperature of passenger side without
changing the air flow temperature of driver side.
• When the air outlet is set to DEF, the temperature control dial (passenger side) is inoperative.
• The set temperature is changed by operating the temperature control dial even if the A/C system is OFF
condition. However, the set temperature is not displayed when the display is turned OFF.
Fan Control Dial
• The fan speed can be selected from the range of 1-7 freely by operating the fan control dial.
• The set temperature, air outlets, and fan speed are displayed on the A/C display by turning the fan control
dial clockwise from the condition that the A/C system is OFF.
• The “AUTO” on the A/C display turns OFF by operating the fan control dial from the condition that the AUTO
switch is ON (automatic control).
A/C Switch
• “A/C OFF” is displayed on the A/C display for several seconds, the A/C switch indicator turns OFF, and the
compressor is turned OFF by pressing the A/C switch from the condition that the compressor is ON (auto-
matic control).
• When pressing the A/C switch again, “A/C ON” is displayed on the A/C display for several seconds, the A/C
switch indicator turns ON, and the compressor is turned to ON.
DEF Switch
JSIIA1331GB
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HAC-4
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
• The “AUTO” on the A/C display turns OFF and the DEF switch indicator turns ON by pressing the DEF
switch from the condition that the AUTO switch is ON (automatic control).
• The set temperature, air outlets (DEF), and fan speed are displayed on the A/C display by pressing the DEF
switch from the condition that the A/C system is OFF. The DEF switch indicator and the A/C switch indicator
illuminate.
• Basically, pressing the DEF switch fixes the air outlet to DEF and the air inlets to fresh air intake. The FRE
switch indicator illuminates, the compressor is turned to ON, and the air flow is set to automatic control. (If
the condition before pressing the DEF switch is the air flow manual control, it is not set to the automatic con-
trol.)
• When pressing the DEF switch again, it returns to the condition that existed before pressing the switch.
However, the air flow manual control is given priority to when the DEF switch is pressed again since the fan
control dial is operated after the DEF switch is pressed once. In addition, the air flow manual selection is
given priority when the DEF switch is pressed again since the fan switch is operated after starting with the
DEF switch from the OFF condition. The air outlets and the air inlets are controlled automatically and the
compressor is still ON.
AUTO Switch
• The AUTO switch indicator turns ON. “AUTO”, set temperature (driver side and passenger side), fan speed,
and air outlets are displayed on the A/C display.
• The air outlets, air inlets, fan speed, and air flow temperature are controlled automatically. (They are set to
the automatic control only when the air inlets are not fixed to recirculation and fresh air intake.)
DUAL Switch
• When the DUAL switch indicator is ON, the driver side and passenger side, temperature can each be set
independently.
• When the DUAL switch indicator is OFF, the driver side setting temperature is applied to both sides.
• The left and right ventilation temperature separately control is cancelled by turning the DEF switch to ON.
REC Switch
• When pressing the REC switch, the REC switch indicator illuminates and the air inlet is fixed to recirculation.
• The REC switch indicator blink twice and the system is switched to the automatic control when pressing the
FRE switch or the REC switch for approximately 2 seconds or more. In addition, the condition of the air inlet
is displayed at the automatic control.
• When FRE switch indicator turned ON, shifting mode position to D/F or DEF, or when compressor is turned
from ON to OFF, REC switch is automatically turned OFF (fixed to fresh air intake). Recirculation mode can
be re-entered by pressing REC switch again, and then compressor is turned ON (Except D/F or DEF posi-
tion).
FRE Switch
• When pressing the FRE switch, the FRE switch indicator illuminates and the air inlet is fixed to fresh air
intake.
• The REC switch indicator blink twice and the system is switched to the automatic control when pressing the
FRE switch or the REC switch for approximately 2 seconds or more. In addition, the condition of the air inlet
is displayed at the automatic control.
Rear Window Defogger Switch
• The “Rear defrost ON” is displayed on the A/C display when pressing the rear window defogger switch. The
indicator of rear window defogger switch illuminates, and then the rear window defogger is turned ON.
• The “Rear defrost OFF” is displayed on the A/C display when pressing the rear window defogger switch
again. The indicator of rear window defogger switch turns OFF, and then the rear window defogger is turned
OFF.
• Refer to
for details.
OFF Switch
• The blower motor and compressor are turned OFF when pressing the OFF switch. At this time, the switch
condition just before OFF is recorded on the set temperature and the left and right ventilation temperature
separately control mode.
• Fix the air inlet to fresh air intake. However, when the REC switch was ON, fix it to recirculation. Inlet status
is displayed by indicator when air conditioner system is OFF.
• Set the air outlet to foot position. (The air outlet can be switched with the MODE switch.)
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AUTOMATIC AIR CONDITIONER SYSTEM
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< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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DISCHARGE AIR FLOW
JSIIA1332GB
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HAC-6
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
AIR DISTRIBUTION
SWITCHES AND THEIR CONTROL FUNCTION
JSIIA1182GB
JSIIA1180GB
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AUTOMATIC AIR CONDITIONER SYSTEM
HAC-7
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[AUTOMATIC AIR CONDITIONER]
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Component Parts Location
INFOID:0000000009163971
ENGINE COMPARTMENT
JSIIA1181GB
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HAC-8
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
PASSENGER COMPARTMENT
1.
Refrigerant pressure sensor
2.
Ambient sensor
3.
Magnetic clutch connector
4.
ECV connector
NNIIA0131ZZ
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AUTOMATIC AIR CONDITIONER SYSTEM
HAC-9
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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Component Description
INFOID:0000000009163972
1.
Mode door motor
2.
Air mix door motor (passenger side)
3.
Preset switch
4
Air mix door motor (driver side)
5.
Sunload sensor
6.
In-vehicle sensor
7.
A/C auto amp.
8.
Intake sensor
9.
Blower motor
10. Intake door motor
JSIIA1329ZZ
Component
Reference
Air mix door motor (driver side)
—
Air mix door motor (passenger side)
—
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HAC-10
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AUTOMATIC AIR CONDITIONER SYSTEM
Ambient sensor
—
A/C auto amp.
—
Blower motor
—
Magnet clutch
—
ECV
—
Intake door motor
—
Intake sensor
—
In-vehicle sensor
—
Mode door motor
—
Preset switch
The preset switch integrated with the controller for A/C operation
and AV switch is installed to the center of the instrument panel.
The operation and the display data of the preset switch are com-
municated with the A/C auto amp. through AV control unit via
CAN communication.
Refrigerant pressure sensor
—
Sunload sensor
—
Component
Reference
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MODE DOOR CONTROL SYSTEM
HAC-11
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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MODE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000009163973
System Description
INFOID:0000000009163974
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
SYSTEM OPERATION
• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends air mix door, mode door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCU and intake door motor LCU.
• The air mix door motors, mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the A/C auto amp. and each of the motor
position sensors are compared by the LCUs in each door motor with the existing decision and opening
angles.
• Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are
returned to the A/C auto amp.
Door Motor Circuit
MODE DOOR CONTROL SPECIFICATION
JSIIA1543GB
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HAC-12
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR CONTROL SYSTEM
• The air outlet can be selected manually by pressing the MODE
switch or the DEF switch of preset switch. The air outlet can be
fixed.
• The automatic control by A/C auto amp. is available by pressing
the AUTO switch.
• Select the mode door position (VENT, B/L, FOOT, D/F) according
to the air flow temperature calculated by the A/C auto amp. based
on the target air mix door position and sunload amount at the air
outlet automatic control.
JSIIA1334GB
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AIR MIX DOOR CONTROL SYSTEM
HAC-13
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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AIR MIX DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000009163975
System Description
INFOID:0000000009163976
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
SYSTEM OPERATION
• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends air mix doors, mode door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCU and intake door motor LCU.
• The air mix door motors, mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the A/C auto amp. and each of the motor
position sensors are compared by the LCUs in each door motor with the existing decision and opening
angles.
• Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are
returned to the A/C auto amp.
Door Motor Circuit
AIR MIX DOOR CONTROL SPECIFICATION
JSIIA1545GB
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HAC-14
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR CONTROL SYSTEM
• The A/C auto amp. always automatically controls the temperature
regardless of the operating condition of air conditioner when the
ignition switch is ON.
• The A/C auto amp. performs the set temperature correction when
the target temperature is set with the temperature control dial of
the preset switch and decides the air mix door position.
• Based on the target air mix door position and the current air mix
door position, it controls the air mixture door to always become the
most suitable air mix door position.
• The air mix door is fixed to the full-cold position when the set tem-
perature is set to 18.0
°
C (60
°
F) and it is fixed to the full-hot posi-
tion when the set temperature is set to 32.0
°
C (90
°
F).
JPIIA0633GB
Revision: 2012 November
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INTAKE DOOR CONTROL SYSTEM
HAC-15
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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INTAKE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000009163977
System Description
INFOID:0000000009163978
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
SYSTEM OPERATION
• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends air mix door, mode door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCU and intake door motor LCU.
• The air mix door motors, mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the A/C auto amp. and each of the motor
position sensors are compared by the LCUs in each door motor with the existing decision and opening
angles.
• Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are
returned to the A/C auto amp.
• The intake door control judges intake door position based on the ambient temperature, the intake air temper-
ature and the in-vehicle temperature. When shifting mode position D/F, when the DEF or OFF switches are
pressed, or when A/C switch is OFF, the A/C auto amp. sets the intake door at the FRE position.
Door Motor Circuit
JSIIA1546GB
JSIIA1133GB
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HAC-16
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR CONTROL SYSTEM
INTAKE DOOR CONTROL SPECIFICATION
• Intake door position is basically fixed at FRE when FRE indicator
of FRE switch is ON or DEF switch is ON.
• Intake door position is basically fixed at REC when REC indicator
of REC switch is ON.
• Intake door automatic control selects FRE, 20 – 80% FRE, or REC
depending on a target air mix door opening angle, based on in-
vehicle temperature, ambient temperature, and sunload amount.
JSIIA1337GB
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BLOWER MOTOR CONTROL SYSTEM
HAC-17
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[AUTOMATIC AIR CONDITIONER]
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BLOWER MOTOR CONTROL SYSTEM
System Diagram
INFOID:0000000009163979
System Description
INFOID:0000000009163980
SYSTEM OPERATION
• For air flow, the manual selection (1-7 speed) with the fan control dial has priority.
• If the AUTO switch is pressed or if the DEF switch is pressed while in the OFF condition, it changes to the
automatic control by A/C auto amp.
• When increasing the air flow, it changes the duty ratio of blower fan motor drive signal to prevent the air flow
from suddenly increasing.
• There are the following types of air flow control: starting air flow control, starting air flow control at low cool-
ant temperature, starting air flow control at high interior air temperature, air flow control at door motor opera-
tion, and air flow control at voice recognition in addition to manual control, normal automatic air flow control.
AIR FLOW CONTROL
Automatic Air Flow Control
• When the target temperature is set by the temperature control dial of preset switch, the A/C auto amp. per-
forms the calculation and decides the target air flow according to the signal from each sensor.
• The A/C auto amp. changes the duty ratio of the blower motor control signal and controls the air flow contin-
uously so that the air flow becomes the target air flow.
• The minimum air flow will change according to the sunload when
the air discharge outlet is VENT or B/L.
Starting Air Flow Control
• When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower
motor control signal to prevent too much air from blowing.
• The time period from when the air flow changes from LOW to HI is approximately 8 seconds.
• It becomes the starting air flow control at low coolant temperature according to the calculation result of auto
amp and engine coolant temperature [approximately 56
°
C (133
°
F) or less] during the automatic air flow con-
trol.
JSIIA1547GB
JPIIA1564GB
Revision: 2012 November
2014 GT-R
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