Infiniti QX4 (R50). Manual - part 461

TERMINAL

NO.

ITEM

CONDITION

Voltage

V

6

Intake door position switch

Intake door position

RECIRCULATION

Approximately 4.6

FRESH or 20% FRESH

Approximately 0

7

Multiplex communication sig-

nal

(AMP

,

NAVI)

—

—

8

Multiplex communication sig-

nal

(NAVI

,

AMP)

—

—

9

Sensor ground

—

Approximately 0

10

Sunload sensor

—

—

11

Thermal transmitter

Engine coolant

temperature

Approximately 30°C (86°F)

Approximately 9.4

Approximately 55°C (131°F)

Approximately 6.5

Approximately 100°C

(212°F)

Approximately 2.4

Approximately 110°C

(230°F)

Approximately 1.9

14

A/C LAN signal

—

Approximately 5.5

17

ECM signal

Compressor: ON

Approximately 0

Compressor: OFF

Approximately 4.6

18

Intake door position switch

Intake door position

FRESH

Approximately 4.6

RECIRCULATION or 20%

FRESH

Approximately 0

19

Intake door position switch

Intake door position

20% FRESH

Approximately 4.6

RECIRCULATION or

FRESH

Approximately 0

20

Multiplex communication sig-

nal (CLK)

—

—

21

Power supply for door motor

—

Approximately 12

22

Compressor ON signal

Compressor: ON

Approximately 0

Compressor: OFF

Approximately 4.6

24

Power supply for BAT

—

BATTERY VOLTAGE

TROUBLE DIAGNOSES

Auto Amp. Terminals and Reference Value (Cont’d)

HA-42

TERMINAL

NO.

ITEM

CONDITION

Voltage

V

25

Power supply for IGN

—

Approximately 12

26

Power supply for intake door

motor

Intake door position

FRE

,

REC

Approximately 12

REC

,

FRE

Approximately 0

32

Ground

—

Approximately 0

33

Power source for A/C

—

Approximately 12

34

Blower motor feed back

Fan speed: Low

Approximately 7 - 10

35

Fan control amp. control sig-

nal

Fan speed: Low, Middle low or Middle high

Approximately 2.5 -

3.0

Fan speed: High

Approximately 9 - 10

36

Power supply for intake door

motor

Intake door position

REC

,

FRE

Approximately 12

FRE

,

REC

Approximately 0

GI

MA

EM

LC

EC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

SC

EL

IDX

TROUBLE DIAGNOSES

Auto Amp. Terminals and Reference Value (Cont’d)

HA-43

Self-diagnosis

=NBHA0021

INTRODUCTION AND GENERAL DESCRIPTION

NBHA0021S01

The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished
by starting the engine (turning the ignition switch from “OFF” to “ON”) and pressing “

” switch for at least

5 seconds. The “

” switch must be pressed within 10 seconds after starting the engine (ignition switch is

turned “ON”). This system will be canceled by either pressing

(AUTO) switch or turning the ignition switch

“OFF”. Shifting from one step to another is accomplished by means of pushing

(HOT) or

(COLD) switch,

as required.
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing

(fan)

UP switch.

Without Navigation System

NBHA0021S0101

RHA453GA

TROUBLE DIAGNOSES

Self-diagnosis

HA-44

STEP-BY-STEP PROCEDURE

=NBHA0021S02

Without Navigation System

NBHA0021S0201

1

SET IN SELF-DIAGNOSTIC MODE

1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned “ON”.), press

switch for at least 5 seconds.

©

GO TO 2.

2

STEP 1 - ALL LEDs AND SEGMENT ARE CHECKED

Do all LEDs and segments illuminate?

RHA454G

Yes or No

Yes

©

GO TO 3.

No

©

Malfunctioning

switch, LED or fluorescent display tube.

Replace A/C auto amp.

3

VERIFY ADVANCE TO SELF-DIAGNOSIS STEP 2

1. Press

(HOT) switch.

2. Does advance to self-diagnosis STEP 2?

Yes or No

Yes

©

GO TO 4.

No

©

Malfunctioning

(HOT) switch.

Replace A/C auto amp.

4

VERIFY RETURN TO SELF-DIAGNOSIS STEP 1

1. Press

(COLD) switch.

2. Does return to self-diagnosis STEP 1?

Yes or No

Yes

©

GO TO 5.

No

©

Malfunctioning

(COLD) switch.

Replace A/C auto amp.

GI

MA

EM

LC

EC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

SC

EL

IDX

TROUBLE DIAGNOSES

Self-diagnosis (Cont’d)

HA-45