Content .. 541 542 543 544 ..

Nissan Sentra. Manual - part 543

HAC-20

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

SYSTEM

Temperature Control

INFOID:0000000009757626

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

automatically controls temperature regardless of front air condi-

tioning 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 18.0

°C (60°F), and at the fully hot position when set

temperature is 32.0

°C (90°F).

Fail-safe

INFOID:0000000009757627

FAIL-SAFE FUNCTION

If a communication error exists between the A/C auto amp., and the AV control unit and preset switch for 30

seconds or longer, air conditioning is controlled under the following conditions:

Discharge air flow

MODE/DEF set-

ting position

Air outlet/distribution

Ventilator

Foot

Defroster

Front

Rear

Front

Rear

Center

Side

48.7%

37.4%

13.9%

—

26.6%

25.6%

13.2%

23.6%

11.0%

—

15.6%

16.9%

32.9%

16.3%

18.3%

—

13.4%

15.1%

27.0%

14.3%

30.2%

—

17.5%

18.8%

—

63.7%

JMIIA0731GB

A/C switch

: ON

Air outlet

: AUTO

Air inlet

: FRE (Fresh air intake)

Blower fan speed

: AUTO

Set temperature

: Setting before communication error occurs

OPERATION

HAC-21

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

OPERATION

Switch Name and Function

INFOID:0000000009757628

CONTROL OPERATION

A/C Switch Assembly

Switch Operation

Temperature control switch (driver
side)

ON/OFF switch

AUTO switch

Fan control switch

A/C switch

DUAL switch

Temperature control switch (pas-
senger side)

Recirculation switch

Fresh air switch

10. Display

11. Mode switch

12. Defroster switch

JMIIA1960ZZ

Switch name

Function

Temperature control
switch (driver side)

Setting temperature can be set according to switch operation within a range between 18.0

°C – 32.0°C at

a rate of 0.5

°C per adjustment.

• Press : Setting temperature increases
• Press : Setting temperature decreases
NOTE:
When air conditioning is OFF, setting temperature can be set only while air conditioning status screen
(only when MODE switch is pressed) is indicated.

ON·OFF switch

Air conditioning turns ON

⇔ OFF each time this switch is pressed.

• When this switch is pressed while air conditioning is ON
- Air conditioning turns OFF and becomes the following status, when this switch is pressed.
• Air outlet: FOOT
• Air flow: OFF
• Air inlet: Settings set before this switch is pressed
• A/C switch: OFF
• When this switch is pressed while air conditioning is OFF
- Air conditioning turns ON and operates according to the settings set before air conditioning is turned

OFF, when this switch is pressed.

HAC-22

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

OPERATION

AUTO switch

• AUTO switch indicator turns ON and air conditioning becomes the following status, when this switch is

pressed while air conditioning is ON.

- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Settings set before this switch is pressed
- A/C switch: ON
• Air conditioning turns ON and operates according to the following status, when this switch is pressed

while air conditioning is OFF. (AUTO switch indicator turns ON)

- Air outlet: Automatic control
- Air flow: Automatic control
- Air inlet: Settings set before this switch is pressed
- A/C switch: ON
NOTE:
When air outlet or air flow is manually operated while AUTO switch indicator is ON, AUTO switch indica-
tor turns OFF. However, automatic control continues for other functions than air outlet or air flow.

Fan switch

• Air flow can be set within a range between 1st – 7th speed according to switch operation.
- Press +: Air flow increases
- Press

−: Air flow decreases

• Air conditioning turns ON and operates according to the following status, when this switch is pressed

while air conditioning is OFF.

- Air outlet: Automatic control
- Air flow: 1st speed
- Air inlet: Settings set before this switch is pressed
- A/C switch: Settings set before air conditioning is turned OFF
NOTE:
Automatic air flow control is cancelled (AUTO switch indicator turns OFF), when fan switch is pressed
while AUTO switch indicator is ON.

A/C switch

Compressor control (switch indicator) changes between ON

⇔ OFF each time this switch is pressed

while blower motor is operated.
NOTE:
A/C switch cannot be turned ON when blower motor is OFF.

DUAL switch

Left and right ventilation temperature separately control (switch indicator) changes between ON

⇔ OFF

each time this switch is pressed while blower motor is operated.
NOTE:
• Setting temperature for passenger side is the same as that for driver side when left and right ventilation

temperature separately control is OFF.

• DUAL switch operation is not accepted when DEF mode is ON.

Temperature control
switch (passenger
side)

• Left and right ventilation temperature separately control (DUAL switch indicator) turns ON according

to switch operation. Air flow temperature of passenger side can be changed without changing air flow
temperature of driver side.

• Setting temperature can be set according to switch operation within a range between 18.0

°C – 32.0°C

at a rate of 0.5

°C per adjustment.

- Press : Setting temperature increases
- Press : Setting temperature decreases
NOTE:
• When air conditioning is OFF, setting temperature can be set only while air conditioning status screen

(only when MODE switch is pressed) is indicated.

• Temperature control switch (passenger side) operation is not accepted when DEF mode is ON.

REC switch

Switch indicator turns ON and air inlet is set to recirculation (REC), when this switch is pressed.
NOTE:
Air inlet can be changed when air conditioning is in OFF status.

FRE switch

Switch indicator turns ON and air inlet is set to fresh air intake (FRE), when this switch is pressed.
NOTE:
Air inlet can be changed when air conditioning is in OFF status.

Switch name

Function

OPERATION

HAC-23

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

MODE switch

Air outlet changes from VENT

⇒ B/L ⇒ FOOT ⇒ D/F ⇒ VENT each time this switch is pressed.

NOTE:
• Air outlet can be changed when air conditioning is in OFF status.
• Automatic air outlet control is cancelled (AUTO switch indicator turns OFF), when MODE switch is

pressed while AUTO switch indicator is ON.

DEF switch

DEF mode (switch indicator) changes between ON

⇔ OFF each time switch is pressed.

• When this switch is pressed while air conditioning is ON
- Air conditioning becomes the following status when DEF mode is turned ON.
• Air outlet: DEF
• Air flow: Settings set before DEF mode is turned ON
• Air inlet: Fresh air intake
• A/C switch: ON
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Settings set before DEF mode is turned ON
• Air flow: Settings set before DEF mode is turned OFF
• Air inlet: Settings set before DEF mode is turned OFF
• A/C switch: Settings set before DEF mode is turned OFF
• When this switch is pressed while air conditioning is OFF
- Air conditioning turns ON and operates in the following status, when DEF mode is turned ON.
• Air outlet: DEF
• Air flow: Automatic control
• Air inlet: Fresh air intake
• A/C switch: ON
- Air conditioning becomes the following status when DEF mode is turned OFF.
• Air outlet: Automatic control
• Air flow: Settings set before DEF mode is turned OFF
• Air inlet: Settings set before DEF mode is turned OFF
• A/C switch: Settings set before DEF mode is turned OFF
NOTE:
When DEF mode is turned ON while AUTO switch indicator is turned ON, AUTO switch indicator turns
OFF. However, automatic air flow control continues.

Switch name

Function

Content .. 541 542 543 544 ..