Nissan Altima L32. Manual - part 822

HAC-62

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

SYMPTOM: A/C system does not come on.

1.

CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL

1. Disconnect front air control connector M37.

2. Press ignition switch ON.

3. Check voltage between front air control connector M37 termi-

nals 19, 39 and 40, and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Check the following.

• 10A fuses [Nos. 6, 19, and 3, located in the fuse block (J/B)]. 

• If fuses are OK, check for open circuit in wiring harness. Repair or replace as necessary.

• If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace as

necessary.

2.

CHECK BODY GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Check continuity between front air control connector M37 termi-

nals 17and 37 and ground.

Is the inspection result normal?

YES

>> • Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

• Inspection End.

NO

>> Repair or replace harness.

AWIIA0642GB

Terminals

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

12V

M37-19

M37-39

M37-40

AWIIA0613ZZ

Terminal

Continuity

(+)

(-)

Connector - Terminal

Body ground

Yes

M37-17

M37-37

AWIIA0620ZZ

AIR CONDITIONER CONTROL

HAC-63

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS

AIR CONDITIONER CONTROL

Reference Value

INFOID:0000000004498230

VALUES ON THE DIAGNOSIS TOOL

Display Item List

TERMINAL LAYOUT

PHYSICAL VALUES

Monitor item name

“operation or unit”

Contents

FAN ON SIG

“ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower fan motor switch signal.

AIR COND SW 

“ON/OFF”

Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.

AWIIA0052ZZ

Termi-

nal No.

Wire

color

Item

Ignition 

switch

Condition

Voltage (V)

(Approx.)

1

L/Y

Blower motor feed back

Fan speed

Low

7.0.- 10.0

3

L/R

A/C LAN signal

—

5.5

5

SB

Compressor ON signal

Compressor

ON

0

OFF

12

7

O

Sunload sensor

—

0 - 5

9

G/W

Water temperature sensor

—

—

16

R/L

Light (+)

Lighting 
switch

OFF

0

1st position

12

17

B

Ground

—

0

18

W/L

Power supply for IGN

—

12

19

V/Y

Power supply for ACC

ACC

—

12

20

L/W

Power supply for mode door 

motor, intake door motor, and 

air mix door motor LH and RH

—

12

21

R/W

Power supply for A/C ON signal

ON

4.6

22

GR

Rear defrost feed back

Defroster 
switch

ON

12

OFF

0

HAC-64

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR CONDITIONER CONTROL

23

GR/W

Rear defrost ON signal

Defroster 

switch

ON

0

OFF

12

24

BR/W

Fan ON signal

Fan

ON

0

OFF

5

25

R/G

Intake sensor

—

0 - 5

26

B/Y

Sensor ground

—

0

27

LG

In-vehicle sensor

—

0 - 5

28

O/B

Ambient sensor

—

5

31

P

Ambient sensor VDD

—

5

36

R/Y

Light (-)

—

0

37

B

Ground

—

0

39

Y/R

Power supply for battery

—

12

40

G

Power supply for IGN

—

12

Termi-

nal No.

Wire

color

Item

Ignition 

switch

Condition

Voltage (V)

(Approx.)

AIR CONDITIONER CONTROL

HAC-65

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Wiring Diagram - Air Conditioner Control (Auto) - Coupe

INFOID:0000000004498231

ABIWA0027GB