Nissan Cube. Manual - part 547

HAC-26

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

Diagnosis Description

INFOID:0000000009950976

ON BOARD SELF-DIAGNOSIS SYSTEM

On board self-diagnosis system is built into A/C auto amp. to quickly locate the case of malfunctions. The self-
diagnosis system diagnoses sensor, door motor, blower motor, etc. and also can make the setting of auxiliary
mechanism.

SELF-DIAGNOSIS PROCEDURE

Self-diagnosis Mode Entry

The self-diagnosis is started by pressing the OFF switch at 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.
• The change of STEP 6 – 7 can be performed by pressing the fan control switch during the condition of

STEP-5.

Self-diagnosis Cancellation

By AUTO switch is pressed or ignition switch is turned OFF, the self-diagnosis is canceled. 

STEP-1: INDICATOR CHECK

Description

A/C switch indicator and A/C 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 DIAGNOSIS

Diagnosis item

Diagnosis content

Diagnosis part

STEP 1:
Indicator check

Switch indicator and display indication are 
checked.

A/C control (A/C auto amp.)

STEP 2:
Sensor diagnosis

The circuit diagnoses of each sensor and 
intake door motor are performed. A/C auto 
amp. indicates the result on the display.

• Ambient sensor
• In-vehicle sensor
• Intake sensor
• Sunload sensor
• Intake door motor (PBR)

STEP 3:
Door motor diagnosis

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

• Mode door motor
• Air mix door motor

STEP 4:
Operation check

Operational check of each part is per-
formed.

• Mode door motor
• Intake door motor
• Air mix door motor
• Blower  motor
• Compressor
• Condenser fan

STEP 5:
Each sensor recognition temperature 
check

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

• Ambient sensor
• In-vehicle sensor
• Intake sensor

STEP 6:
Temperature setting trimmer

Temperature setting trimmer is performed.

—

STEP 7:
Inlet port memory function

Inlet port memory function is performed.

—

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

HAC-27

< SYSTEM DESCRIPTION >

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Description

When STEP-2 is selected, “2” is indicated on the display for 3 seconds, in this period, sensor diagnosis is
started.
Normal: “20” is displayed.

Malfunction: The ones place digit of corresponding code number blinks 2 times on the A/C display. When
short-circuit error, “AUTO” blinks on the display.
NOTE:
If two or more sensors, or door motor malfunction, the ones place digit of corresponding code numbers blink
respectively twice. 

Diagnosis Result

*: Perform the self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code
NO. 25 indicates despite that sunload sensor is functioning normally.

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.

• When performing the diagnosis of intake door motor, the target angle of PBR is set at 40%.
• The error judgment status of intake door motor is not decided by open or short circuit, it is decided by the

voltage value as follows:

- Short: 2.5 V or more
- Open: 1.5 V or less

STEP-3: DOOR MOTOR DIAGNOSIS

Description

When STEP-3 is selected, “3” is indicated on the display for 1 second, in this period, door motor diagnosis is
started.
The check of door motor is performed by A/C auto amp. transmitting output signal to each door motor.

JPIIA1675GB

Code No.

Corresponding sensor 

or door motor

Malfunctioning judgment condition

Reference

Open

Short

21 / AUTO 21

Ambient sensor

−

42

°

C (

−

44

°

F) or less

100

°

C (212

°

F) or more

HAC-33, "Diagnosis Proce-
dure"

22 / AUTO 22

In-vehicle sensor

−

42

°

C (

−

44

°

F) or less

100

°

C (212

°

F) or more

HAC-36, "Diagnosis Proce-
dure"

24 / AUTO 24

Intake sensor

−

42

°

C (

−

44

°

F) or less

100

°

C (212

°

F) or more

HAC-39, "Diagnosis Proce-
dure"

25 / AUTO 25

Sunload sensor*

33 W/m

2

 (28 kcal/m

2

·h)

1677 W/m

2

 (1442 kcal/m

2

·h)

HAC-41, "Diagnosis Proce-
dure"

26 / AUTO 26

Intake door motor (PBR)

PBR angle 30% or less

PBR angle 50% or more

HAC-50, "Diagnosis Proce-
dure"

HAC-28

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

Normal: “30” is displayed.

Malfunction: The ones place digit of corresponding code number blinks 2 times on the A/C display. When
short-circuit error, “AUTO” blinks on the display.
NOTE:
If two or more door motor connectors malfunction, the ones place digit of corresponding code numbers blink
respectively twice. 

NOTE:
When the malfunctioning condition as following figure, “31” is displayed. 

Diagnosis Result

NOTE:
• If all four terminals of each door motor show an open circuit, there is probably a disconnected connector or

an open circuit in door motor drive power supply harness.

• If a short circuit occurs in harness between terminals for each door motor drive signal, although it cannot be

detected by self-diagnosis, door motor will vibrate when it operates.

Door Motor Starting Position Reset

• Pressing DEF switch during STEP-3 will send a reset signal to air mix door and mode door motor to reset

them to starting position.

JPIIA1676GB

JPIIA1677GB

Code No.

Corresponding door 

motor

Malfunctioning judgment condition

Reference

31 / AUTO 31

Air mix door motor

Short or open circuit of air mix door 
drive signal terminal 4

HAC-44, "Diagnosis Procedure"

32 / AUTO 32

Short or open circuit of air mix door 
drive signal terminal 1

33 / AUTO 33

Short or open circuit of air mix door 
drive signal terminal 2

34 / AUTO 34

Short or open circuit of air mix door 
drive signal terminal 3

35 / AUTO 35

Mode door motor

Short or open circuit of mode door drive 
signal terminal 4

HAC-47, "Diagnosis Procedure"

36 / AUTO 36

Short or open circuit of mode door drive 
signal terminal 1

37 / AUTO 37

Short or open circuit of mode door drive 
signal terminal 2

38 / AUTO 38

Short or open circuit of mode door drive 
signal terminal 3

DIAGNOSIS SYSTEM (A/C AUTO AMP.)

HAC-29

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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• During reset operation, DEF switch indicator and “30” blink for approximately 9 seconds.

STEP-4: OPERATION CHECK

Description

When STEP-4 is selected, each part operation is started with indicating “4” on the display.
Each time DEF switch is pressed, the display will change to 41 

→

 42 

→

 43 

→

 44 

→

 45 

→

 46 

→

 41.

Operation Contents

Checks must be visually, by listening the sound or by touching air outlets with hand, etc. for improper opera-
tion.

STEP-5: EACH SENSOR RECOGNITION CHECK

Description

When STEP-5 is selected, “5” is indicated on the display.
Each time DEF switch is pressed, each sensor recognition temperature is changed in order of the following:
5 

→

 Ambient temperature 

→

 In-vehicle temperature 

→

 Intake temperature 

→

 5.

NOTE:
Each sensor recognition temperature is not displayed in less than 

−

30

°

C (

−

22

°

F) or more than 55

°

C (131

°

F).

STEP-6: TEMPERATURE SETTING TRIMMER

Description

The trimmer compensates for differences in range of 

±

3

°

C (

±

6

°

F) between temperature setting (displayed dig-

itally) and temperature felt by customer.

Setting Procedure

Refer to 

HAC-10, "Temperature Setting Trimmer"

.

STEP-7: INLET PORT MEMORY FUNCTION

Description

• Inlet port setting can be memorized when ignition switch is turned OFF.
• Inlet port setting can be selected from FRE (fresh air intake), REC (recirculation), or “Do not perform the

memory” when ignition switch is turned ON.

Setting Procedure

Refer to 

HAC-11, "Inlet Port Memory Function"

.

Code No.

Mode door posi-

tion

Intake door posi-

tion

Air mix door posi-

tion

Magnet clutch

Blower fan motor

(voltage)

Condenser fan 

ON signal

41

VENT

REC

Full cold

ON

5 V

ON

42

B/L

REC

Full cold

ON

10.5 V

ON

43

B/L

20% FRE

Medium (50%)

ON

8.5 V

ON

44

FOOT

80% FRE

Medium (50%)

OFF

8.5 V

OFF

45

D/F

FRE

Full hot

OFF

8.5 V

OFF

46

DEF

FRE

Full hot

ON

Battery voltage

ON