Nissan Quest E52. Manual - part 729

HAC-46

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

OPERATION

NOTE:
The following switches are not necessary for ACCS (Advanced Climate Control System) operation.

Switch name

Function

AUTO intake switch

• Automatic intake control (exhaust gas/outside odor detecting mechanism) (switch indicator) changes 

between ON 

⇔

 OFF each time when AUTO intake switch is pressed while front blower motor is acti-

vated.

• Front air conditioning becomes the following status when AUTO intake switch is turned ON.
- Air inlet: Recirculation [After approximately 5 minutes, air inlet is switched to automatic intake control 

(exhaust gas/outside odor detecting mechanism).]

- A/C switch: ON
• Front air conditioning becomes the following status when AUTO intake switch is turned OFF.
- Air inlet: Fresh air intake
- A/C switch: Stays ON
NOTE:
• Interlocking condition of A/C switch can be changed. Refer to 

HAC-85, "AUTO Intake Switch Interlock-

ing Movement Change Function"

.

• AUTO intake switch operation is not accepted when the following status.
- Air outlet: D/F or DEF
- Ambient temperature: 0

°

C (32

°

F) or less

Intake switch

Refer to 

HAC-34, "FRONT AUTOMATIC AIR 

CONDITIONING SYSTEM : Switch Name and 
Function"

.

Temperature control 
switch (driver side)

MODE switch

ON·OFF switch

AUTO switch

Fan switch

A/C switch

DUAL switch

Temperature control 
switch (passenger 
side)

DEF switch

REAR switch

Refer to 

HAC-39, "REAR AUTOMATIC AIR 

CONDITIONING SYSTEM : Switch Name and 
Function"

.

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

HAC-47

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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DIAGNOSIS SYSTEM (A/C AUTO AMP.)

Description

INFOID:0000000009652529

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings
using diagnosis function of each control unit.

On Board Diagnosis Function

INFOID:0000000009652530

ON BOARD DIAGNOSIS ITEM

On board diagnosis function of A/C auto amp. consists of steps 1 to 8. Diagnosis for sensors, motors, and etc.
can be performed by each step. System settings can be also changed by each step.

ECU

Diagnostic item

(CONSULT)

A/C auto amp.

On board diagnosis function

BCM

BCM-AIR CONDITIONER

Self Diagnostic Result

Data Monitor

ECM

ENGINE

Self Diagnostic Result

Data Monitor

IPDM E/R

IPDM E/R

Self Diagnostic Result

Data Monitor

Auto active test

Diagnosis item

Diagnosis content

Diagnosis part

STEP 1:
Indicator check

Switch indicator and display indication are 
checked.

• Front A/C control (A/C auto amp.)
• Rear A/C control

STEP 2:
Sensor / door motor diagnosis

The circuit diagnoses of each sensor and 
air mix door motor are performed. A/C 
auto amp. indicates the result on the dis-
play.

• Ambient sensor
• Front in-vehicle sensor
• Rear in-vehicle sensor
• Intake sensor
• Sunload sensor
• Front air mix door motor (driver side)
• Front air mix door motor (passenger side)
• Rear air mix door motor
• Exhaust gas/outside odor detecting sen-

sor

• Exhaust gas/outside odor detecting sen-

sor harness

STEP 3:
Door motor diagnosis

The circuit diagnoses of front mode door 
motor, rear mode door motor and intake 
door motor are performed. A/C auto amp. 
indicates the result on the display.

• Front mode door motor
• Rear mode door motor
• Intake door motor

STEP 4:
Operation check

Operational check of each part is per-
formed.

• Front mode door motor
• Intake door motor
• Front air mix door motor (driver side)
• Front air mix door motor (passenger side)
• Front blower motor
• Compressor
• Rear mode door motor
• Rear air mix door motor
• Rear blower motor
• Ionizer

• Plasmacluster

™

 ion operation status)

STEP 5-1:
Each sensor recognition temperature 
check

Each sensor recognition temperature is in-
dicated on the display.

• Ambient sensor
• Front In-vehicle sensor
• Intake sensor
• Rear in-vehicle sensor

HAC-48

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

*: With ACCS (Advanced Climate Control System)

METHOD OF STARTING

Self-diagnosis Mode Entry

The self-diagnosis is started by pressing the ON·OFF switch for 5 seconds or more within 10 seconds after
starting engine. 
NOTE:
If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a
result, the system may generate an error even when operation is normal. Start engine before performing this
diagnosis to avoid this.

Changes of Step up and Step down

• The changes of STEP 1 – 5 can be performed by pressing the temperature control switch (driver side) of

front A/C control.

• The change of STEP 5 – 8 can be performed by pressing the fan switch of front A/C control during the con-

dition of STEP 5.

Self-diagnosis Cancellation

By pressing AUTO switch of front A/C control or turning ignition switch OFF, the self-diagnosis is canceled. 

STEP 1: INDICATOR CHECK

Description

Front A/C control (switch indicator and display) and rear A/C control (display) indication are checked. 
Normal: All switch indicator and display indication are turned ON.
Malfunction: Malfunctioning part indicator is not turned ON.

STEP 2: SENSOR / DOOR MOTOR DIAGNOSIS

Description

When STEP 2 is selected, “2” is indicated on the display, and then self-diagnosis result is indicated.
Normal: “20” is displayed.
Malfunction: Corresponding code number displayed. (When short-circuit error, A/C switch indicator turns ON)
NOTE:
Corresponding code Nos. indicates 1 second each if two or more sensors and door motors malfunction.

STEP 5-2:
EEPROM system diagnosis

A/C auto amp. EEPROM memory function 
error detected.

A/C auto amp.

STEP 6-1:
Temperature setting trimmer (front/rear)

Setting change of temperature setting 
trimmer (front/rear) can be performed.

—

STEP 6-2:
Foot position setting trimmer

Setting change of foot position setting 
trimmer can be performed.

—

STEP 6-3:
Inlet port memory function

Setting change of inlet port memory func-
tion can be performed.

—

STEP 7:
Exhaust gas/outside odor detecting sen-

sor sensitivity adjustment function

*

Setting change of exhaust gas/outside 
odor detecting sensor sensitivity adjust-
ment function can be performed.

—

STEP 8:
AUTO intake switch interlocking move-

ment change function

*

Setting change of AUTO intake switch in-
terlocking movement change function can 
be performed.

—

Diagnosis item

Diagnosis content

Diagnosis part

JMIIA1785GB

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

HAC-49

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Self-diagnosis Result

: A/C switch indicator

*1: Perform the self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sun-
load sensor, otherwise code No. “25” indicates despite that sunload sensor is functioning normally.
*2: The following display pattern will appear if front air mix door motor (driver side) harness connector is dis-
connected:
“26” 

→

 “26” 

→

 Return to “26”.

*3: With ACCS (Advanced Climate Control System)
NOTE:
• When ambient sensor has the malfunction of open circuit, the sensor judges that ambient temperature is

extremely cold, and controls the in vehicle temperature to warmly.

• Inspect door motor circuit, when all door motor system malfunction are detected. Refer to 

HAC-118, "Diag-

nosis Procedure"

.

STEP 3: DOOR MOTOR DIAGNOSIS

Description

“3” is indicated on the display, and then self-diagnosis result is indicated.
The check of door motor is performed by A/C auto amp. transmitting output signal to each door motor.
Normal: “30” is displayed.
Malfunction: Corresponding code number displayed.
NOTE:
Corresponding code Nos. indicates 1 seconds each if two or more mode or intake door motors malfunction.

Self-diagnosis Result

Code No.

Corresponding sensor or 

door motor

Malfunctioning judgment condition

Reference

Open

Short

21 / 

21

Ambient sensor

−

44

°

C (

−

47

°

F) or less

100

°

C (212

°

F) or more

HAC-94, "Diagnosis Proce-
dure"

22 / 

22

Front in-vehicle sensor

−

44

°

C (

−

47

°

F) or less

100

°

C (212

°

F) or more

HAC-96, "Diagnosis Proce-
dure"

23 / 

23

Rear in-vehicle sensor

−

44

°

C (

−

47

°

F) or less

100

°

C (212

°

F) or more

HAC-102, "Diagnosis Proce-
dure"

24 / 

24

Intake sensor

−

44

°

C (

−

47

°

F) or less

100

°

C (212

°

F) or more

HAC-98, "Diagnosis Proce-
dure"

25 / 

25

Sunload sensor

*1

65 W/m

2

 or less

2832 W/m

2

 or more

HAC-100, "Diagnosis Proce-
dure"

26 / 

26

Front air mix door motor 

(driver side)

*2

PBR angle 5% or less

PBR angle 95% or more

HAC-106, "Diagnosis Proce-
dure"

27 / 

27

Front air mix door motor 

(passenger side)

*2

PBR angle 5% or less

PBR angle 95% or more

HAC-108, "Diagnosis Proce-
dure"

28 / 

28

Rear air mix door motor

*2

PBR angle 5% or less

PBR angle 95% or more

HAC-114, "Diagnosis Proce-
dure"

29 / 

29

Exhaust gas/outside odor 

detecting sensor

*3

Duty ratio 90% or more

Duty ratio 10% or less

HAC-114, "Diagnosis Proce-
dure"

SJIA1782E