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.

Revision: 2011 October

2012 JUKE

HAC-6

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000007577549

BCM
Refer to

BCS-6, "BODY CONTROL

SYSTEM : Component Parts Loca-
tion"

Magnet clutch

Refrigerant pressure sensor

Ambient sensor

ECM
Refer to

EC-16, "ENGINE CON-

TROL SYSTEM :
Component Parts Location"

IPDM E/R
Refer to

PCS-5, "Component Parts

Location"

Multi display unit

Intake door motor

Air mix door motor

10. Intake sensor

11.

In-vehicle sensor

12. Power transistor

13. Aspirator

14. A/C auto amp.

15. Blower motor

16. Mode door motor

17. Sunload sensor

JMIIA1048ZZ

Revision: 2011 October

2012 JUKE

COMPONENT PARTS

HAC-7

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Component Description

INFOID:0000000007577550

A/C UNIT ASSEMBLY

A/C UNIT ASSEMBLY : Aspirator

INFOID:0000000007577551

The aspirator generates the vacuum by the air blown from the A/C
unit assembly and draws the air of the passenger room to the in-
vehicle sensor area via the aspirator duct.

A/C UNIT ASSEMBLY : Intake Sensor

INFOID:0000000007577552

Intake sensor measures temperature of evaporator fin temperature. The sensor uses a thermistor which is
sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature
increases.

A/C UNIT ASSEMBLY : Air Mix Door Motor

INFOID:0000000007577553

• The step motor system is adopted for air mix door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position. Refer to

HAC-15, "Door Control"

• Rotation of motor is transmitted to air mix door (upper air mix door and lower air mix door) by lod and lever.

Air flow temperature is switched.

Left side of A/C unit assembly

Instrument lower panel LH is re-
moved

Back side of A/C unit assembly

Multi display unit is removed

Right side of A/C unit assembly

Right side of switch panel

Component

Description

A/C unit assembly

Aspirator

Intake sensor

Air mix door motor

Mode door motor

Intake door motor

Blower motor

Power transistor

Multi display unit

A/C auto amp.

BCM

ECM

IPDM E/R

Ambient sensor

In-vehicle sensor

Sunload sensor

Refrigerant pressure sensor

HAC-9

Magnet clutch

HAC-10

RJIA1804E

Revision: 2011 October

2012 JUKE

HAC-8

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

A/C UNIT ASSEMBLY : Mode Door Motor

INFOID:0000000007577554

• The step motor system is adopted for mode door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position. Refer to

HAC-15, "Door Control"

• Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side

ventilator door, and foot door) by link, lod, and lever. Air outlet is switched.

A/C UNIT ASSEMBLY : Intake Door Motor

INFOID:0000000007577555

• Intake door motor consists of motor that drives door and PBR (Potentio Balance Register) that detects door

position.

• Motor operates intake door according to control signal from A/C auto amp. Refer to

HAC-15, "Door Control"

• Rotation of motor is transmitted to intake door by lever. Air inlet is switched.
• PBR (Potentio Balance Register) transmits PBR feedback signal to A/C auto amp. according to motor posi-

tion.

• According to PBR feedback signal, A/C auto amp. monitors that motor is in an appropriate door position.

A/C UNIT ASSEMBLY : Blower Motor

INFOID:0000000007577556

• The blower motor utilizes a brush-less motor with a rotating mag-

net.

• Quietness is improved over previous motors where the brush was

the point of contact and the coil rotated.

A/C UNIT ASSEMBLY : Power Transistor

INFOID:0000000007577557

• Power transistor, that uses MOS field effect transistor, is adopted

for blower motor speed control.
NOTE:
MOS field effect transistor is a transistor for which the gate portion
is composed of a metal electrode on an oxide layer of semiconduc-
tor. Field effect transistor is controlled by voltage, while ordinary
transistor is controlled by current. Electrode of field effect transistor
is called source, drain, or gate, while electrode of ordinary transis-
tor is called emitter, collector, or base.

• Power transistor continuously controls voltage to blower motor,

according to gate voltage from A/C auto amp.

• This power transistor does not require a HI relay even when the

maximum voltage is applied to blower motor at HI status, because voltage drop is nominal.

JPIIA1575ZZ

ZHA152H

JPIIA1634ZZ

Revision: 2011 October

2012 JUKE

COMPONENT PARTS

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Multi Display Unit

INFOID:0000000007577558

• Multi display unit integrates display and operation switches.
• Operation of each switch (A/C operation signal) and setting status (A/C ECO setting signal and ECO mode

signal) are transmitted to A/C auto amp. via CAN communication.

• Operation status of air conditioning system is indicated in the display according to A/C display signal that is

received from A/C auto amp.

A/C Auto Amp.

INFOID:0000000007577559

A/C auto amp. controls automatic air conditioning system by inputting and calculating signals from each sen-
sor and each switch. A/C auto amp. has self-diagnosis function. Diagnosis of automatic air conditioning sys-
tem can be performed quickly.

BCM

INFOID:0000000007577560

BCM transmits A/C ON signal and blower fan ON signal from A/C auto amp. to ECM via CAN communication
line.

ECM

INFOID:0000000007577561

• ECM, when receiving A/C ON signal and blower fan ON signal from BCM, transmits A/C compressor request

signal to IPDM E/R via CAN communication according to status of the engine and refrigerant pressure.

• ECM transmits engine coolant temperature signal to A/C auto amp. via CAN communication line.

IPDM E/R

INFOID:0000000007577562

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when A/C compressor request signal is
received from ECM via CAN communication line.

Ambient Sensor

INFOID:0000000007577563

Ambient sensor measures ambient air temperature. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

In-vehicle Sensor

INFOID:0000000007577564

In-vehicle sensor measures temperature of intake air that flows through aspirator to passenger room. The sen-
sor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

Sunload Sensor

INFOID:0000000007577565

Sunload sensor measures sunload amount. This sensor converts sunload amount to voltage signal by photo-
diode and transmits to A/C auto amp.

Refrigerant Pressure Sensor

INFOID:0000000007577566

DESCRIPTION

• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it

to ECM.

• ECM operates cooler cycle protection and cooling fan speed control according to voltage value that is input.

STRUCTURE AND OPERATION

PBIB2657E

Revision: 2011 October

2012 JUKE

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection ares and a

signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance

according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static

capacitance into a voltage value, and transmits the voltage value to ECM.

Magnet Clutch

INFOID:0000000007577567

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

Revision: 2011 October

2012 JUKE

SYSTEM

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

SYSTEM

System Diagram

INFOID:0000000007577568

System Description

INFOID:0000000007577569

DESCRIPTION

• Automatic air conditioning system is controlled by each function of A/C auto amp., BCM, ECM and IPDM E/

• Each operation of air conditioning system is transmitted from multi display unit via CAN communication. A/C

auto amp. transmits each type of indication information to multi display unit via CAN communication. Multi
display unit displays each type of indication information that is received.

CONTROL BY A/C AUTO AMP.

•

HAC-12, "Temperature Control"

•

HAC-13, "Air Outlet Control"

•

HAC-13, "Air Flow Control"

•

HAC-14, "Air Inlet Control"

•

HAC-14, "Compressor Control"

•

HAC-15, "Door Control"

•

HAC-18, "ECO Mode Control"

• Correction for input value

Ambient temperature correction

- The A/C auto amp. inputs the temperature detected with the ambient sensor as the ambient temperature.

JMIIA1049GB

Revision: 2011 October

2012 JUKE

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

- Perform the correction of the temperature detected with the ambient sensor for air conditioning control.
- Select and use the initial value of ambient temperature data depending on the engine coolant temperature

when turning the ignition switch from OFF to ON. Use the detection temperature of the ambient sensor at
low coolant temperature [less than approximately 56

C (133

F)]. Use the memory data (before the ignition

switch is OFF) when the engine is warming up [approximately 56

C (133

F) or more].

- Do not perform the correction of the ambient temperature when the detection temperature of the ambient

temperature is less than approximately

−

C (–4

F).

Passenger room temperature correction

- The A/C auto amp. inputs the temperature detected with the in-vehicle sensor as the passenger room tem-

perature.

- Perform the correction of the temperature detected with the in-vehicle sensor for air conditioning control.
- The A/C auto amp. performs the correction so that the recognition passenger room temperature changes

depending on the difference between the detected passenger room temperature and the recognition pas-
senger room temperature. If the difference is large, the changing is early. The changing becomes slow as
the difference becomes small.

Intake temperature correction

- The A/C auto amp. inputs the temperature detected with the intake sensor as the intake temperature.
- Perform the correction of the temperature detected with the intake sensor for air conditioning control.
- The A/C auto amp. performs the correction so that the recognition intake temperature changes depending

on the difference between the detected intake temperature and the recognition intake temperature. If the dif-
ference is large, the changing is early. The changing becomes slow as the difference becomes small.

Sunload amount correction

- The A/C auto amp. inputs the sunload amount detected with the sunload sensor.
- Perform the correction of the sunload amount detected with the sunload sensor for air conditioning control.
- When the sunload amount suddenly changes, for example when entering a tunnel, perform the correction so

that the recognition sunload amount of the A/C auto amp. changes slowly.

Set temperature correction

- A/C auto amp. controls The A/C auto amp. performs the correction to the target temperature set by the tem-

perature control switch so as to match the temperature felt by the passengers depending on the ambient
temperature detected with the ambient sensor and controls it so that the interior air temperature is always
the most suitable.

CONTROL BY BCM

•

HAC-14, "Compressor Control"

CONTROL BY ECM

•

HAC-14, "Compressor Control"

• Cooling fan control. Refer to

EC-54, "COOLING FAN CONTROL : System Description"

CONTROL BY IPDM E/R

•

HAC-14, "Compressor Control"

• Cooling fan control. Refer to

PCS-9, "POWER CONTROL SYSTEM : System Description"

Temperature Control

INFOID:0000000007577570

• When ignition switch is in the ON position, A/C auto amp. always

automatically controls temperature regardless of air conditioner
operational state.

• A/C auto amp. calculates the target air mix door opening angle

depending on set temperature, in-vehicle temperature, ambient
temperature, and sunload.

• Air mix door is controlled depending on the comparison of current

air mix door opening angle and target air mix door opening angle.

• Regardless of in-vehicle temperature, ambient temperature, and

sunload, air mix door is fixed at the fully cold position when set
temperature is 18

C (60

F), and at the fully hot position when set

temperature is 32

C (90

F).

JPIIA0633GB

Revision: 2011 October

2012 JUKE

SYSTEM

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

Air Outlet Control

INFOID:0000000007577571

• While air outlet is in automatic control, A/C auto amp. selects the

mode door position depending on a target air mix door angle and
outlet air temperature calculated from sunload.

• If ambient temperature is excessively low, D/F is selected to pre-

vent windshield fogging when air outlet is set to FOOT.

Air Flow Control

INFOID:0000000007577572

DESCRIPTION

• A/C auto amp. changes gate voltage of power transistor and controls air flow continuously. When air flow is

increased, voltage of blower motor gradually increases to prevent a sudden increase in air flow.

• In addition to manual control and automatic control, air flow control is compose of starting fan speed control,

low coolant temperature starting control, high in-vehicle temperature starting control, and blower speed con-
trol at door motor operation.

AUTOMATIC AIR FLOW CONTROL

• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes voltage of blower motor and controls air flow continuously so that air flow matches to

target air flow.

• When air outlet is VENT or B/L, the minimum air flow is changed

depending on sunload.

STARTING FAN SPEED CONTROL

When blower motor is activated, A/C auto amp. gradually increases voltage of blower motor to prevent a sud-
den increase in discharge air flow. (T

1 –

= approximately 8 seconds)

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

LOW COOLANT TEMPERATURE STARTING CONTROL

JMIIA0710GB

JMIIA1129GB

JMIIA1130GB

Revision: 2011 October

2012 JUKE

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

If the engine coolant temperature is 56

C (133

F) or less, to prevent

a cold discharged air flow, A/C auto amp. suspends blower motor
activation for the maximum 150 seconds depending on target air mix
door opening angle. After this, voltage of blower motor is increased
gradually, and blower motor is activated.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
temporarily fan speed so that mode door moves smoothly.

HIGH IN- TEMPERATURE STARTING CONTROL

When evaporator temperature is high [intake air temperature sensor value is 35

C (95

F) or more], to prevent

a hot discharged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so
that evaporator is cooled by refrigerant.

Air Inlet Control

INFOID:0000000007577573

• While air inlet is in automatic control, A/C auto amp. selects air

inlet (fresh air intake, 20% fresh air intake, or recirculation)
depending on set temperature, in-vehicle temperature, and ambi-
ent temperature.

• Air inlet is fixed to 80% FRE, only when the conditions are satisfied

as follows:

- Air inlet is FOOT or D/F
- Ambient temperature is 2

C (36

F) or less

- Maximum fan speed

Compressor Control

INFOID:0000000007577574

DESCRIPTION

• When the compressor activation condition is satisfied while blower motor is activated, A/C auto amp. trans-

mits A/C ON signal and blower fan ON signal to BCM.

• BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to

BCS-12, "SIGNAL BUFFER SYSTEM : System Description"

• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,

etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.

• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-

vates the compressor. Refer to

PCS-6, "RELAY CONTROL SYSTEM : System Description"

CONTROL BY A/C AUTO AMP.

Low Temperature Protection Control

When intake sensor detects that evaporator fin temperature is 2

(36

F) or less, A/C auto amp. requests ECM to turn the compressor

OFF, and stops the compressor.
When the air temperature returns to 3.5

C (38

F) or more, the com-

pressor is activated.

JMIIA1227GB

JMIIA0711GB

JMIIA1055GB

Revision: 2011 October

2012 JUKE

SYSTEM

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

CONTROL BY ECM

Compressor Protection Control at Pressure Malfunction

When the high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.82 kg/cm

, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)

• 2.74 MPa (27.95 kg/cm

, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)

• 0.14 MPa (1.43 kg/cm

, 20.3 psi) or less

Compressor Oil Circulation Control

When the engine starts while the engine coolant temperature is 56

C (133

F) or less, ECM activates the com-

pressor for approximately 6 seconds and circulates the compressor oil once.

Air Conditioning Cut Control

When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor. Refer to

EC-52, "AIR CONDITIONING CUT CONTROL : System Description"

Door Control

INFOID:0000000007577575

DOOR MOTOR CONTROL

• A/C auto amp. receives the detection data from each sensor.
• Intake door motor, when receiving control signal from A/C auto amp. moves intake door to the appropriate

position based on the door position detection signal of each PBR (Potentio Balance Resistor).

• Each motor of air mix and mode, when receiving drive signal from A/C auto amp., moves each door to the

appropriate position according to drive signal.

DRIVE METHOD OF STEPPING MOTOR TYPE MOTOR

• Stepping motor type motor is driven by 4 pieces of drive coil that are sequentially excited.
• Direction of rotation is changeable by recomposing pattern of excitation.

SWITCH AND THEIR CONTROL FUNCTION

SJIA0971E

Revision: 2011 October

2012 JUKE

HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

*: Models for Canada

Intake door

Blower motor

In-cabin microfilter filter

Evaporator

Upper air mix door

Lower air mix door

Heater core

Foot door

Side ventilator door

10. Sub defroster door

11.

Center ventilator and defroster door

Fresh air intake

Recirculation air

Defroster

Center ventilator

Side ventilator

Foot

Rear foot

Switch/dial position

Door position

r ve

ila

r an

d d

r do

b d

ter

ila

tor do

r ai

r mi

r ai

r mi

AUTO switch

AUTO

JPIIA1584ZZ

Revision: 2011 October

2012 JUKE

SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

HAC

AIR DISTRIBUTION

Models except for Canada

Models for Canada

MODE switch

VENT

—

B/L

FOOT

D/F

DEF switch

Intake switch

—

Temperature control dial

Full cold

C (60

—

18.5

C (61

F) –

31.5

C (89

AUTO

Full hot

C (90

OFF switch

—

Switch/dial position

Door position

nte

r v

tila

r an

fros

r do

b de

r do

ent

ila

r do

r ai

r mi

x do

r ai

r mi

x do

Discharge air flow

MODE/DEF setting po-

sition

Air outlet/distribution

Ventilator

Foot

Defroster

Center

Side

52.6%

47.3%

—

34.0%

27.7%

38.4%

—

19.1%

57.9%

23.0%

—

13.5%

42.4%

44.1%

—

16.3%

—

83.8%

Discharge air flow

MODE/DEF setting

position

Air outlet/distribution

Ventilator

Foot

Defroster

Center

Side

Front

Rear

52.6%

47.3%

—

28.2%

25.9%

29.6%

16.3%

—

16.3%

43.0%

21.0%

19.7%

Revision: 2011 October

2012 JUKE

Content .. 137 138 139 140 ..