Nissan Sentra. Manual - part 542

HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

SYSTEM

• Rotation of motor is transmitted to air mix door (driver side) [upper air mix door (driver side) and lower air mix

door (driver side)] by link, rod and lever, then air flow temperature (driver side) is switched.

DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.

• Direction of rotation is changeable by recomposing pattern of excitation.

AIR MIX DOOR MOTOR (PASSENGER SIDE) 

DESCRIPTION

• The step motor system is adopted for air mix door motor (passenger side).

• 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.

• Rotation of motor is transmitted to air mix door (passenger side) [upper air mix door (passenger side) and

lower air mix door (passenger side)] by link, rod and lever, then air flow temperature (passenger side) is

switched.

DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.

• Direction of rotation is changeable by recomposing pattern of excitation.

MODE DOOR MOTOR

DESCRIPTION

• 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.

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

ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.

DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.

JMIIA1954GB

JMIIA1955GB

SYSTEM

HAC-17

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

• Direction of rotation is changeable by recomposing pattern of excitation.

INTAKE DOOR MOTOR

• 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.

• Rotation of motor is transmitted to intake door by lever, then 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.

SWITCHES AND THEIR CONTROL FUNCTION

JZIIA0033GB

JSIIA1633GB

HAC-18

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

SYSTEM

Intake door

Blower motor

Air conditioner filter

Evaporator

Upper air mix door (driver side/pas-
senger side)

Lower air mix door (driver side/pas-
senger side)

Heater core

Foot door

Side ventilator door

Sub defroster door

Center ventilator and defroster door

Fresh air intake

Recirculation air

Discharge air

Defroster

Center ventilator

Side ventilator

Rear ventilator

Front foot

Rear foot

JMIIA1958ZZ

SYSTEM

HAC-19

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

*: Inlet status is displayed by indicator during activating automatic control

AIR DISTRIBUTION

Switch position

Door position

Mode door

In

take

 do

or

Air mix door

(Driver side)

(Passenger 

side)

Ce

nte

r v

en

tila

to

r an

d 

de

fros

te

r do

or

Su

b de

fr

os

te

r do

or

Si

de

 ve

nt

ila

to

r do

or

Fo

ot

 do

or

Up

pe

r ai

r mi

x do

or

Lo

we

r ai

r mi

x do

or

Up

pe

r ai

r mi

x do

or

Lo

we

r ai

r mi

x do

or

AUTO switch

AUTO

—

—

—

—

—

MODE switch

DEF switch

REC switch

*

—

—

—

—

FRE switch

*

Temperature control 
switch (Driver side)

DUAL 
switch: 
OFF

Full cold

18

°C

—

18.5

°C – 31.5°C

AUTO

Full hot

32

°C

Temperature control 
switch (Driver side)

DUAL 
switch: 
ON

Full cold

18

°C

—

—

18.5

°C – 31.5°C

AUTO

Full hot

32

°C

Temperature control 
switch (Passenger 
side)

Full cold

18

°C

—

—

18.5

°C – 31.5°C

AUTO

Full hot

32

°C

ON·OFF switch

OFF

—

—