Nissan Titan A60. Instruction — part 636

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-227

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000006164837

COMPONENT DESCRIPTION

Front Air Control

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

information sent from various sensors needed for air conditioner

operation. The air mix door motor, mode door motor, intake door

motor, defroster door motor, blower motor and A/C compressor are

then controlled.

The front air control is unitized with control mechanisms. When the

various switches and temperature dials are operated, data is input to

the front air control.

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to

hot or any intermediate position by rotating the temperature control

dial.

Front Air Control Component Function Check

INFOID:0000000006164838

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1. Turn the blower control dial clockwise to low speed.

2. Press the A/C switch.

3. Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to

HAC-227, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000006164839

Regarding Wiring Diagram information, refer to

HAC-232, "Wiring Diagram - Instruction With 3 Control Dial Sys-

tem"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA0551ZZ

AWIIA0478ZZ

HAC-228

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

SYMPTOM: A/C system does not come on.

1.

CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connectors.

3. Turn ignition switch ON.

4. Check voltage between front air control harness connector

M176 terminals 14, 22, and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to

PG-72, "Terminal

Arrangement"

.

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

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

sary.

2.

CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Check continuity between front air control harness connector

M176 terminal 1 and ground.

Is the inspection result normal?

OK

>> Replace front air control. Refer to

VTL-8, "Removal and

Installation"

.

NG

>> Repair harness or connector.

WJIA0414E

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

front air

control

connector

Terminal No.

M176

14

Ground

Approx. 0V

Approx. 0V

Battery
voltage

22

Battery
voltage

Battery
voltage

Battery
voltage

AWIIA1087ZZ

1 - Ground

: Continuity should exist.

AWIIA0552ZZ

MANUAL A/C IDENTIFICATION TABLE

HAC-229

< ECU DIAGNOSIS INFORMATION >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS INFORMATION

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000006164840

Instruction A/C Type

Description

Visual Identification

Instruction A/C (Type 1)

Two Control Dial System

Instruction A/C (Type 2)

Three Control Dial System

[with variable blower control

(VBC)]

AWIIA0481ZZ

AWIIA0478ZZ

HAC-230

< ECU DIAGNOSIS INFORMATION >

[MANUAL A/C (TYPE 2)]

AIR CONDITIONER CONTROL

AIR CONDITIONER CONTROL

Front Air Control Terminals Reference Values

INFOID:0000000006164841

Measure voltage between each terminal and ground by following

Terminals and Reference Value for front air control (1).

FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT

TERMINALS AND REFERENCE VALUES FOR FRONT AIR CONTROL

AWIIA0551ZZ

AWIIA0441ZZ

Terminal

No.

Wire

color

Item

Ignition

switch

Condition

Voltage (V)

(Approx.)

1

B

Ground

-

-

0V

2

Y

V ref ACTR (5V)

ON

-

0 - 5V

3

W/G

Air mix door motor CW

ON

Clockwise rotation

Battery voltage

4

G

Air mix door motor CCW

ON

Counterclockwise rotation

Battery voltage

5

BR/W

Mode door motor CW

ON

Clockwise rotation

Battery voltage

6

P/L

Mode door motor CCW

ON

Counterclockwise rotation

Battery voltage

7

O

Intake door motor CW

ON

Clockwise rotation

Battery voltage

8

G/B

Intake door motor CCW

ON

Counterclockwise rotation

Battery voltage

9

L/B

Intake sensor

ON

-

0 - 5V

11

Y/B

Rear defogger request *1

ON

-

Battery voltage

12

W/R

Compressor ON signal

ON

A/C switch OFF

5V

ON

A/C switch ON

0V

14

Y/G

Power supply for IGN

ON

-

Battery voltage

15

P

V ref ACTR (ground)

ON

-

5V

16

GR

Mode door motor feedback

ON

-

0 - 5V

18

SB

Air mix door motor feedback

ON

-

0 - 5V

19

LG

Defroster door motor CW

ON

Clockwise rotation

Battery voltage

20

P/B

Defroster door motor CCW

ON

Counterclockwise rotation

Battery voltage

21

V/R

Sensor ground

ON

-

0V

22

Y/R

Power supply for BAT

-

-

Battery voltage

23

R/L

Illumination +

ON

Park lamps ON

Battery voltage