Nissan Altima L32. Instruction — part 840

HAC-134

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

8.

CHECK CAN COMMUNICATION CIRCUITS

Check CAN communication circuits between BCM to ECM and between ECM to IPDM E/R. Refer to

LAN-13,

"CAN Diagnosis with CONSULT-III"

.

Is the inspection result normal?

YES

>> ECM malfunctioning.

NO

>> Repair or replace component based on the result of diagnosis.

POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

HAC-135

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

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POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

Description

INFOID:0000000004498280

COMPONENT DESCRIPTION

FRONT AIR CONTROL

The front air control has a built-in microcomputer which processes

information sent from temperature control dial and various switches

needed for air conditioner operation. The air mix door motor, mode

door motor, intake door motor, blower motor and compressor are

then controlled.

POTENTIO TEMPERATURE CONTROL (PTC)

The PTC is built into the front air control.

Component Function Check

INFOID:0000000004498281

COMPONENT INSPECTION

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK

1. Press A/C switch (indicator should illuminate).

2. Confirm that the compressor clutch engages (sound or visual inspection).
Can a symptom be duplicated?

YES

>> GO TO 3

NO

>> GO TO 2

2.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to

HAC-102, "Operational Check"

.

Is the inspection result normal?

YES

>> Refer to

HAC-155, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

CHECK MAIN POWER SUPPLY AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to

HAC-135, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to

VTL-8, "Removal and Installation"

.

NO

>> Repair as necessary.

Diagnosis Procedure

INFOID:0000000004498282

DIAGNOSIS PROCEDURE FOR A/C SYSTEM

AWIIA0040ZZ

HAC-136

< COMPONENT DIAGNOSIS >

[MANUAL 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 39 and 40, and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Check the following.

• 10A fuses [Nos. 6, 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.

AWIIA0047GB

Terminals

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

12V

M37-39

M37-40

AWIIA0635ZZ

Terminal

Continuity

(+)

(-)

Connector - Terminal

Body ground

Yes

M37-17

M37-37

AWIIA0620ZZ

AIR CONDITIONER CONTROL

HAC-137

< ECU DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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ECU DIAGNOSIS

AIR CONDITIONER CONTROL

Reference Value

INFOID:0000000004498283

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

16

R/L

Light (+)

Lighting
switch

OFF

0

1st position

12

17

B

Ground

—

0

18

W/L

Power supply for IGN

—

12

20

L/W

Power supply for mode door

motor, intake door motor, and

air mix door motor

—

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