Infiniti QX4 (R50). Manual — part 464

INTRODUCTION AND GENERAL DESCRIPTION

NBHA0021S04

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

(fan)

UP switch.

With Navigation System

NBHA0021S0401

RHA859H

TROUBLE DIAGNOSES

Self-diagnosis (Cont’d)

HA-54

STEP-BY-STEP PROCEDURE

NBHA0021S05

With Navigation System

NBHA0021S0501

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 DISPLAY SCREEN ARE CHECKED

When switch’s LED and display are functioning properly in STEP-1, LED and display will come on.

RHA860H

OK or NG

OK

©

GO TO 3.

NG

©

Malfunctioning

switch, LED or fluorescent display tube.

Go to “Main Power Supply and Ground Circuit Check”, HA-72.

3

VERIFY ADVANCE TO SELF-DIAGNOSIS STEP 2

1. Turn temperature dial clockwise.
2. Does advance to self-diagnosis STEP 2?

Yes or No

Yes

©

GO TO 4.

No

©

Malfunctioning temperature dial.
Check Display & NAVI control unit.

4

VERIFY RETURN TO SELF-DIAGNOSIS STEP 1

1. Turn temperature dial counterclockwise.
2. Does return to self-diagnosis STEP 1?

Yes or No

Yes

©

GO TO 5.

No

©

Malfunctioning temperature dial.
Check Display & NAVI control unit.

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-55

5

STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT

Turn temperature dial clockwise.
Does code No.

appear on the display?

RHA970DB

Yes or No

Yes

©

GO TO 6.

No

©

GO TO 14.

6

STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Turn temperature dial clockwise.
Does code No.

appear on the display?

RHA869DD

Yes or No

Yes

©

GO TO 7.

No

©

GO TO 15.

TROUBLE DIAGNOSES

Self-diagnosis (Cont’d)

HA-56

7

STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED

Turn temperature dial clockwise.
Engine running.
Press DEF switch, code No. of each actuator test is indicated on the display.

RHA495A

©

GO TO 8.

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-57