Nissan GT-R (2007-2014 year). HEATER & AIR CONDITIONING CONTROL SYSTEM. Service Manual — part 4

HAC-18

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

• Do not perform the starting air flow control when the air discharge outlet is set to DEF.

Low Coolant Temperature Starting Control

• It stops the blower motor for approximately 150 seconds at the maximum according to the target air mix door

position based on the calculation result of A/C auto amp. and engine coolant temperature [approximately
56

°

C (133

°

F) or less] when starting the automatic air flow control. Then, it increases the duty ratios gently so

as not to blow cold air underfoot.

• Change the increase rate of the duty ratio to the normal automatic air flow control when the engine coolant

temperature is approximately 56

°

C (133

°

F) or more in the starting air flow control at low coolant tempera-

ture.

High In-vehicle Temperature Starting Control

Turn the blower motor to OFF while the evaporator is cooled by the refrigerant (approximately 3 seconds) to
prevent the hot air from blowing out when the evaporator temperature is high [approximately 35

°

C (95

°

F) or

more of intake sensor detection temperature] at starting the blower motor.

Fan Speed Control at Door Motor Operation

When the mode door motor operated at the air flow automatic control, it decreases the air flow of the blower
motor once and controls it so that the mode door motor moves smoothly.

Fan Speed Control at Voice Recognition

When the voice command switch is operated at the air flow automatic control, it decreases the air flow of the
blower motor once and controls it so as not to disturb the voice recognition function. In addition, this control
continues while the voice recognition function is operating.

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MAGNET CLUTCH CONTROL SYSTEM

HAC-19

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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MAGNET CLUTCH CONTROL SYSTEM

System Diagram

INFOID:0000000009163981

System Description

INFOID:0000000009163982

SYSTEM OPERATION

• When A/C switch, AUTO switch, DEF switch is pressed or when shifting mode position D/F, A/C auto amp.

transmits A/C switch signal and blower fan motor switch signal to ECM, via CAN communication.

• ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-

sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends A/C compressor request
signal to IPDM E/R, via CAN communication.

• Upon receipt of A/C compressor request signal from ECM, IPDM E/R turns A/C relay ON to operate com-

pressor.

• When sending A/C compressor request signal to IPDM E/R via CAN communication line, ECM simulta-

neously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.

• ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feedback

signal to control air inlet.

COMPRESSOR PROTECTION CONTROL

Compressor Protection Control at Pressure Malfunction

The high-pressure side pressure detected by the refrigerant pressure sensor is approximately 3,120 kPa (31.8
kg/cm

2

, 452 psi) or more when the engine speed is less than 1,500 rpm. It is approximately 2,740 kPa (27.9

kg/cm

2

, 397 psi) when the engine speed is 1,500 rpm or more. When it is approximately 120 kPa (1.2 kg/cm

2

,

17 psi) or less, ECM turns the A/C relay to OFF and stops the compressor.

Compressor Oil Circulation Control

When the engine coolant temperature is approximately 56

°

C (133

°

F) or less, it turns the compressor to ON at

the engine start for approximately 6 seconds and circulates the compressor oil.

Low Temperature Protection Control

It turns the A/C relay OFF and stops the compressor by the signal from A/C auto amp. according to the evap-
orator passing air temperature detected by the intake sensor.

NNIIA0133GB

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HAC-20

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH CONTROL SYSTEM

It turns the compressor to OFF when the evaporator passing air tem-
perature becomes

−

5

°

C (23

°

F) or less. In addition, it turns the com-

pressor to ON when the evaporator passing air temperature
becomes 1

°

C (34

°

F) or more.

Operating Rate Control

It controls the operating rate of the compressor by the ambient temperature when the set temperature is set to
any condition other than the full cold or when the air outlet is “VENT”, “B/L”, or “FOOT”.

Air Conditioner Cut Control

ECM turns the A/C relay to OFF and stops the compressor at engine high load.

Fail-safe Control

When a communication malfunction between A/C auto amp. and AV control unit and preset switch is continu-
ing for approximately 30 seconds or more, the A/C auto amp. automatically controls air outlet and fan speed,
fixes the air inlet to fresh air intake, maintains the set temperature data before the communication malfunction
occurred, and turns the compressor to ON. Turn the compressor to ON with the following conditions if the con-
dition before the communication error occurs was A/C switch OFF.

SJIA0267E

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CAN COMMUNICATION SYSTEM

HAC-21

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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CAN COMMUNICATION SYSTEM

Description

INFOID:0000000009163983

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on board multi-
plex communication line with high data communication speed and excellent error detection ability. A modern
vehicle is equipped with many ECMs, and each control unit shares information and links with other control
units during operation (not independent). In CAN communication, 2 control units are connected with 2 commu-
nication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less wiring. Each
control unit transmits/receives data but selectively reads required data only. Refer to

LAN-11, "CAN System

Specification Chart"

.

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HAC-22

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

A/C AUTO AMP.

ECU DIAGNOSIS INFORMATION

A/C AUTO AMP.

Wiring Diagram - AIR CONDITIONER CONTROL SYSTEM -

INFOID:0000000009164035

For connector terminal arrangements, harness layouts, and alphabets in a

(option abbreviation; if not

described in wiring diagram), refer to

GI-12, "Connector Information"

.

JCIWA0468GB

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A/C AUTO AMP.

HAC-23

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

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Fail-safe

INFOID:0000000009164036

FAIL-SAFE FUNCTION

When a communication malfunction between A/C auto amp., and AV control unit and preset switch continued
for approximately 30 seconds or more, control the air conditioner under the following conditions.

JCIWA0469GB

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HAC-24

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

A/C AUTO AMP.

Compressor

: ON

Air outlet

: AUTO

Air inlet

: FRE (Fresh air intake)

Fan speed

: AUTO

Preset temperature

: Setting before communication error occurs

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PRECAUTIONS

HAC-25

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

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PRECAUTION

PRECAUTIONS

Precaution for Working Range at a Regular Dealership

INFOID:0000000009196925

CAUTION:

The service items unmentioned on this manual are recommended to be performed by a GT-R certified
NISSAN dealer. Because those service items require special equipment and a GT-R certified technical
staff who completed special training.

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000009164048

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution for Battery Service

INFOID:0000000009164049

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.

General Precautions

INFOID:0000000009164050

CAUTION:

After finishing servicing, check that all the tools and waste are stored in a customary place.

Revision: 2012 November

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HAC-26

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

PRESET SWITCH

REMOVAL AND INSTALLATION

PRESET SWITCH

Exploded View

INFOID:0000000009164051

Removal and Installation

INFOID:0000000009164052

REMOVAL

Refer to

AV-87, "Exploded View"

(BASE AUDIO WITH NAVIGATION) or

AV-180, "Exploded View"

(BOSE

AUDIO WITH NAVIGATION).

INSTALLATION

Installation is basically the reverse order of removal.

1.

A/C auto amp. bracket RH

2.

A/C auto amp.

3.

A/C auto amp. bracket LH

4.

Instrument panel garnish LH

5.

Preset switch

6.

Instrument panel garnish RH

7.

Instrument panel garnish

NNIIA0061ZZ

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A/C AUTO AMP.

HAC-27

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

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A/C AUTO AMP.

Exploded View

INFOID:0000000009164053

Removal and Installation

INFOID:0000000009164054

REMOVAL

1.

Remove preset switch. Refer to

AV-87, "Exploded View"

(BASE AUDIO WITH NAVIGATION) or

AV-180,

"Exploded View"

(BOSE AUDIO WITH NAVIGATION).

2.

Remove set-up switch assembly. Refer to

IP-12, "Exploded View"

.

3.

Remove cluster lid C (lower). Refer to

IP-12, "Exploded View"

.

4.

Remove mounting screws (A).

5.

Disconnect A/C auto amp. harness connector, and then remove
A/C auto amp. (1) together with A/C auto amp. bracket.

6.

Remove mounting screws (A), and then remove A/C auto amp.
bracket from A/C auto amp. (1).

INSTALLATION

Installation is basically the reverse order of removal.

1.

A/C auto amp. bracket RH

2.

A/C auto amp.

3.

A/C auto amp. bracket LH

4.

Instrument panel garnish LH

5.

Preset switch

6.

Instrument panel garnish RH

7.

Instrument panel garnish

NNIIA0061ZZ

JSIIA1251ZZ

NNIIA0072ZZ

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HAC-28

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

AMBIENT SENSOR

Exploded View

INFOID:0000000009164055

Removal and Installation

INFOID:0000000009164056

REMOVAL

1.

Remove radiator cover. (This work should be performed by GT-R certified NISSAN dealer.)

2.

Disconnect ambient sensor connector, and then remove ambient sensor.

INSTALLATION

Installation is basically the reverse order of removal.

1.

Ambient sensor

NNIIA0020ZZ

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IN-VEHICLE SENSOR

HAC-29

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

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IN-VEHICLE SENSOR

Exploded View

INFOID:0000000009164057

Removal and Installation

INFOID:0000000009164058

REMOVAL

1.

Remove instrument lower panel (driver). Refer to

IP-12, "Exploded View"

.

2.

Remove mounting screw of in-vehicle sensor, and then remove in-vehicle sensor from instrument lower
panel (driver).

INSTALLATION

Installation is basically the reverse order of removal.

1.

In-vehicle sensor

2.

Instrument lower panel (driver)

NNIIA0135ZZ

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HAC-30

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

SUNLOAD SENSOR

SUNLOAD SENSOR

Exploded View

INFOID:0000000009164059

Removal and Installation

INFOID:0000000009164060

REMOVAL

1.

Remove front defroster grille (left) (1), using remover tools (A).
Refer to

VTL-8, "Exploded View"

.

2.

Disconnect sunload sensor connector, and then remove sunload
sensor (2).

INSTALLATION

Installation is basically the reverse order of removal.

1.

Sunload sensor

2.

Front defroster grille (left)

3.

Instrument panel assembly

NNIIA0136ZZ

NNIIA0137ZZ

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DOOR MOTOR

HAC-31

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

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DOOR MOTOR

Exploded View

INFOID:0000000009164065

INTAKE DOOR MOTOR

INTAKE DOOR MOTOR : Removal and Installation

INFOID:0000000009164066

REMOVAL

1.

Remove instrument panel (assist). Refer to

IP-12, "Exploded View"

.

1.

Air mix door motor (driver side)

2.

Air mix door motor adapter

3.

Heater & cooling unit assembly

4.

Ventilator door lever

5.

Foot door lever

6.

Foot door link

7.

Air mix door motor adapter

8.

Air mix door motor (passenger side) 9.

Ventilator door link

10. Blower unit

11.

Intake door lever 2

12. Intake door motor

13. Intake door link

14.

Intake door lever 1

15. Mode door motor

16. Mode door motor bracket

17.

Main link

18. Main link sub

19. Max.cool door link

20.

Defroster door link

21. Max.cool door lever

22. Defroster door lever

JSIIA1425ZZ

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HAC-32

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

DOOR MOTOR

2.

Remove mounting nuts (A).

3.

Disconnect ECM connectors, and then remove ECM (1) with
bracket attached.

4.

Remove power steering control unit. (This work should be performed by GT-R certified NISSAN dealer.).

5.

Remove mounting screws of intake door motor, and then remove intake door motor from blower unit.

6.

Disconnect intake door motor connector.

INSTALLATION

Installation is basically the reverse order of removal.

MODE DOOR MOTOR

MODE DOOR MOTOR : Removal and Installation

INFOID:0000000009164067

REMOVAL

1.

Remove blower unit. Refer to

VTL-15, "Exploded View"

.

2.

Remove mounting screws of mode door motor, and then remove mode door motor from heater & cooling
unit assembly.

3.

Disconnect mode door motor connector.

INSTALLATION

installation is basically the reverse order of removal.

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR : Removal and Installation

INFOID:0000000009164068

REMOVAL

Driver Side

1.

Set the temperature (driver side) at 18.0

°

C (60

°

F).

2.

Disconnect the battery cable from the negative terminal.

CAUTION:

The angle may be out, when installing the air mix door motor to the air mix door, unless the above
2 procedures are performed.

3.

Remove instrument lower panel (driver). Refer to

IP-12, "Exploded View"

.

4.

Remove mounting screws of air mix door motor, and then remove air mix door motor.

5.

Disconnect air mix door motor connector.

Passenger Side

1.

Set the temperature (passenger side) at 18.0

°

C (60

°

F).

2.

Disconnect the battery cable from the negative terminal.

CAUTION:

The angle may be out, when installing the air mix door motor to the air mix door, unless the above
2 procedures are performed.

3.

Remove instrument lower panel (assist). Refer to

IP-12, "Exploded View"

.

4.

Remove mounting screws of air mix door motor, and then remove air mix door motor.

5.

Disconnect air mix door motor connector.

INSTALLATION

JSIIA1196ZZ

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DOOR MOTOR

HAC-33

< REMOVAL AND INSTALLATION >

[AUTOMATIC AIR CONDITIONER]

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Installation is basically the reverse order of removal.

Revision: 2012 November

2014 GT-R