Nissan Qashqai J11. Manual - part 1098

HAC-28

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

Except for Europe and Russia

*: Air inlet status is displayed by indicator during activating automatic control

AIR DISTRIBUTION

Without rear ventilator, without rear foot

Switch/dial position

Door position

Mode door

In

ta

k

e

 do

or

Air mix door

Ce

nt

e

r v

e

n

til

at

o

r a

n

d

 de

fr

ost

e

r 

do

or

S

u

b

 de

fros

te

r do

or

Si

de

 v

e

n

til

at

o

r 

do

or

Fo

ot doo

r

Driver side

Pa

ss

en

ge

r si

de

AUTO switch

AUTO

—

—

—

MODE switch

DEF switch

REC switch

*

—

—

—

—

FRE switch

*

Temperature control 
dial (Driver side)

DUAL 
switch: 
OFF

Full cold

18.0

°

C

—

18.5

°

C – 31.5

°

C

AUTO

Full hot

32.0

°

C

Temperature control 
dial (Driver side)

DUAL 
switch: 
ON

Full cold

18.0

°

C

—

18.5

°

C – 31.5

°

C

AUTO

Full hot

32.0

°

C

Temperature control 
dial (Passenger side)

Full cold

18.0

°

C

—

18.5

°

C – 31.5

°

C

AUTO

Full hot

32.0

°

C

ON·OFF switch

OFF

—

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Front foot

Defroster

Center

Side

V/D*

40%

35%

—

25%

VENT

54%

46%

—

—

B/L

31%

40%

29%

—

SYSTEM

HAC-29

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

*: These positions are applied only to models for Europe and Russia.

Without rear ventilator, with rear foot

With rear ventilator, with rear foot

AUTOMATIC AIR CONDITIONING SYSTEM : Cooling Fan Control

INFOID:0000000010503110

DESCRIPTION

A/C auto amp. controls the cooling fan operation request according to the refrigerant pressure status and vehi-
cle speed status.
NOTE:
For an overview of the cooling fan and information about control, refer to 

ECH-33, "COOLING FAN CONTROL

: System Description"

 (HR engine models), 

ECM-74, "COOLING FAN CONTROL : System Description"

(MR16DDT engine models), 

ECM-654, "COOLING FAN CONTROL : System Description"

 (MR20DD engine

models), 

ECK-34, "COOLING FAN CONTROL : System Description"

 (K9K engine models) or 

EC9-37,

"COOLING FAN CONTROL : System Description"

 (R9M engine models).

CONTROL OUTLINE

• A/C auto amp. receives the refrigerant pressure sensor signal from ECM via CAN communication, and the

vehicle speed signal from the combination meter via CAN communication.

ALL*

21%

34%

31%

14%

FOOT

—

10%

58%

32%

D/F

—

9%

43%

48%

DEF

—

10%

—

90%

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Front foot

Defroster

Center

Side

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Foot

Defroster

Center

Side

Front

Rear

V/D

40%

35%

—

—

25%

VENT

54%

46%

—

—

—

B/L

33%

40%

16%

11%

—

ALL

22%

35%

16%

11%

16%

FOOT

—

11%

32%

25%

32%

D/F

—

8%

24%

19%

49%

DEF

—

10%

—

—

90%

Discharge air flow

MODE position

Air outlet/distribution

Ventilator

Foot

Defroster

Front

Rear

Front

Rear

Center

Side

V/D

39%

27%

11%

—

—

23%

VENT

47%

38%

15%

—

—

—

B/L

25%

34%

13%

18%

10%

—

ALL

21%

27%

11%

20%

10%

11%

FOOT

—

7%

4%

38%

24%

27%

D/F

—

6%

2%

30%

17%

45%

DEF

—

8%

2%

—

—

90%

HAC-30

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

• A/C auto amp. sets one of the optionally determined stages according to the received refrigerant pressure

sensor signal and vehicle speed signal.
NOTE:
For the rules that prescribe the predetermined stages, refer to the following figures.
• Vehicle speed stages

Vehicle speed [Km/h (MPH)]

-

: 12 (7.5)

-

: 20 (12)

-

: 72 (45)

-

: 80 (50)

• Refrigerant pressure stages

Refrigerant pressure [MPa (bar, kg/cm

2

, psi)]

-

: 0.7 (7, 7.14, 102)

-

: 1.0 (10, 10.2, 145)

-

: 1.28 (12.8, 13.1, 186)

-

: 1.58 (15.8, 16.1, 229)

-

: 1.88 (18.8, 19.2, 273)

-

: 2.08 (20.8, 21.2, 302)

• The requested cooling fan operation strength (0%, 40%, 100%%) is determined as shown in the following

table according to the combination of these two stages, and the request signal is transmitted to ECM via
CAN communication.

Cooling fan operation strength

Unit: %

AUTOMATIC AIR CONDITIONING SYSTEM : Door Motor Starting Position Reset 
Control

INFOID:0000000010503109

• Step motors are used for the mode door motor air mix door motor (driver side/passenger side), and intake

door motor.

• Because the step motors do not have position detection mechanisms, there may be a deviation between the

door position recognized by A/C auto amp. and the actual door position.
Therefore, A/C auto amp. performs motor zero position reset for aligning its recognized door position with
the actual door position.

• The reset signal is transmitted from A/C auto amp. to the air mix door motor (driver side/passenger side),

mode door motor, and intake door motor, which then perform zero position reset.

• After any of the following conditions is met, A/C auto amp. performs motor zero position reset when the igni-

tion switch is next turned ON.

- The battery terminal is disconnected and then reconnected.
- The travel distance reaches 3,000 km (1846 miles). [Performed every 3,000 km (1846 miles).]
• If A/C auto amp., air mix door motor (driver side, passenger side), mode door motor, or intake door motor is

removed, it is necessary to perform motor zero position reset using CONSULT.

JMIIA3568GB

JMIIA3569GB

—

Refrigerant pressure stages

1

2

3

4

Vehicle speed stag-
es

1

40

40

100

100

2

40

40

100

100

3

0

0

0

100

SYSTEM

HAC-31

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AUTOMATIC AIR CONDITIONING SYSTEM : Fail-safe

INFOID:0000000010502850

FAIL-SAFE FUNCTION

If a communication error exists between the A/C auto amp. and A/C control for 30 seconds or longer, air con-
ditioning is controlled under the following conditions: A/C auto amp. is controlled in the setting state before the
communication error occurs for following setting.
• Set temperature
• Air outlet
• Blower fan speed
• Air inlet
• A/C switch

PTC HEATER CONTROL SYSTEM

PTC HEATER CONTROL SYSTEM : System Description

INFOID:0000000010499351

SYSTEM DIAGRAM

DESCRIPTION

• BCM performs PTC relay ON/OFF control based on engine speed, engine coolant temperature, electrical

power cut freeze signal (permission signal, retention signal, stop signal), blower motor operation state sig-
nal, front window defogger state signal, ambient temperature signal, battery voltage, and electrical load state
(high beam request, low beam request, and others).

• When PTC relay turns ON, power supply is supplied to PTC heater. Heating element is heated and air flow

temperature is increased. Heating is available for a period of time until engine coolant temperature is
increased when engine starts cold in cold climate.

• Idle up request signal is transmitted from BCM to ECM while PTC heater operates. Idle speed is increased,

warming-up is facilitated, and battery electric power is obtained.

• Electric power supplied to PTC heating element is subject to PTC relay control conditions. 

NOTE:
PTC heater operation depends on ambient temperature and battery voltage. PTC heater is ON when ambient
temperature is 8

°

C or less. PTC heater is OFF when ambient temperature is 12

°

C (53.6

°

F) or more. PTC

heater is ON when battery voltage is 11.5 V or more. PTC heater is OFF when battery voltage is 11 V or less.

STOP/START SYSTEM

JMIIA3582GB

PTC heater

Operation

PTC relay-1

PTC relay-2

PTC relay-3

Electric power (W)

OFF

OFF

OFF

OFF

OFF

Approx. 0

PTC heater-1

LOW

ON

OFF

OFF

Approx. 333

PTC heater-2

MID

ON

ON

OFF

Approx. 666

PTC heater-3

HI

ON

ON

ON

Approx. 999