Content .. 1 2 3 4 ..

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

2014 GT-R

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-3

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

Revision: 2012 November

2014 GT-R

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

DEF-3, "System Description"

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.)

Revision: 2012 November

2014 GT-R

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-5

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

DISCHARGE AIR FLOW

JSIIA1332GB

Revision: 2012 November

2014 GT-R

HAC-6

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

AIR DISTRIBUTION

SWITCHES AND THEIR CONTROL FUNCTION

JSIIA1182GB

JSIIA1180GB

Revision: 2012 November

2014 GT-R

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-7

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

Component Parts Location

INFOID:0000000009163971

ENGINE COMPARTMENT

JSIIA1181GB

Revision: 2012 November

2014 GT-R

HAC-8

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

PASSENGER COMPARTMENT

Refrigerant pressure sensor

Ambient sensor

Magnetic clutch connector

ECV connector

NNIIA0131ZZ

Revision: 2012 November

2014 GT-R

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

Component Description

INFOID:0000000009163972

Mode door motor

Air mix door motor (passenger side)

Preset switch

Air mix door motor (driver side)

Sunload sensor

In-vehicle sensor

A/C auto amp.

Intake sensor

Blower motor

10. Intake door motor

JSIIA1329ZZ

Component

Reference

Air mix door motor (driver side)

—

Air mix door motor (passenger side)

—

Revision: 2012 November

2014 GT-R

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

Revision: 2012 November

2014 GT-R

MODE DOOR CONTROL SYSTEM

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

JSIIA1133GB

Revision: 2012 November

2014 GT-R

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

Revision: 2012 November

2014 GT-R

AIR MIX DOOR CONTROL SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

• 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

JSIIA1133GB

Revision: 2012 November

2014 GT-R

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

2014 GT-R

INTAKE DOOR CONTROL SYSTEM

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

• 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

Revision: 2012 November

2014 GT-R

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

Revision: 2012 November

2014 GT-R

BLOWER MOTOR CONTROL SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

Content .. 1 2 3 4 ..