Nissan Sentra. Manual - part 551

HAC-52

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS AND REPAIR WORKFLOW

>> GO TO 2.

2.

SYMPTOM CHECK

Verify symptoms.

>> GO TO 3.

3.

CHECK FOR DTCS

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

PERFORM DTC DIAGNOSTIC PROCEDURE

Perform the diagnostic procedure for the detected DTC. Refer to 

HAC-37, "DTC Inspection Priority Chart"

.

>> GO TO 7.

5.

OPERATION CHECK

Perform the operation check. Refer to 

HAC-53, "Work Procedure"

.

>> GO TO 6.

6.

SYMPTOM DIAGNOSIS

Check the symptom diagnosis table. Refer to 

HAC-97, "Diagnosis Chart By Symptom"

.

>> GO TO 8.

7.

VERIFY REPAIR.

With CONSULT

1. Turn ignition switch ON.

2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.

3. Check DTC.
Is any DTC detected?

YES

>> GO TO 4.

NO

>> GO TO 8.

8.

PERFORM FINAL OPERATION CHECK

Perform the operation check. Refer to 

HAC-53, "Work Procedure"

.

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 2.

OPERATION INSPECTION

HAC-53

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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OPERATION INSPECTION

Work Procedure

INFOID:0000000009757641

DESCRIPTION

The purpose of the operational check is to check that the individual system operates normally.

INSPECTION PROCEDURE

1.

CHECK MEMORY FUNCTION

1. Start the engine.

2. Operate the temperature control switch (driver side) and raise the temperature setting to 32

°C (90°F). 

3. Press the OFF switch.

4. Turn the ignition switch OFF.

5. Turn the ignition switch ON.

6. Press the AUTO switch.

7. Check that the temperature setting, before turning the ignition switch OFF, is stored. 
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check power and ground circuits for A/C auto amp. Refer to 

HAC-83, "A/C AUTO AMP. : Diagno-

sis Procedure"

.

2.

CHECK BLOWER MOTOR SPEED

1. Operate the fan control dial. Check that the fan speed changes. 

2. Check the operation for all fan speeds.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check blower motor system. Refer to 

HAC-90, "Diagnosis Procedure"

.

3.

CHECK DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)

1. Press the MODE switch and the DEF switch.

2. Check that the air outlets change according to each indicated air outlet by placing a hand in front of the

outlets. Refer to 

HAC-12, "System Description"

. 

NOTE:

Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRE (

) when the D/F (

) or DEF (

) is selected.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check mode door system. Refer to  

HAC-77, "Diagnosis Procedure"

.

4.

CHECK INTAKE AIR

1. Press the REC (

) switch. Indicator is turned ON.

2. Press the FRE (

) switch. Indicator is turned ON.

3. Listen for the intake door position change. (Slight change of blower sound can be heard.)

NOTE:
Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and the FRE (

) switch is

pressed when the D/F (

) or DEF (

) is selected.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check intake door system. Refer to 

HAC-79, "Diagnosis Procedure"

.

5.

CHECK A/C SWITCH

1. Press the A/C switch.

2. The A/C switch indicator is turned ON.

Confirm that the A/C compressor clutch engages (sound or visual inspection).

Is the inspection result normal?

Conditions

: Engine running at normal operating temperature

HAC-54

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

OPERATION INSPECTION

YES

>> GO TO 6.

NO

>> Check magnet clutch system. Refer to 

HAC-94, "Diagnosis Procedure"

.

6.

CHECK TEMPERATURE DECREASE

1. Operate the A/C compressor. 

2. Operate the temperature control switch (driver side) and lower the temperature setting to 18

°C (60°F). 

3. Check that the cool air blows from the outlets. 
Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Check for insufficient cooling. Refer to 

HAC-99, "Diagnosis Procedure"

.

7.

CHECK TEMPERATURE INCREASE

1. Operate the temperature control switch (driver side) and raise the temperature setting to 32

°C (90°F) after

warming up the engine. 

2. Check that the warm air blows from the outlets.
Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Check for insufficient heating. Refer to 

HAC-101, "Diagnosis Procedure"

.

8.

CHECK DUAL MODE FUNCTION

1. Press the DUAL mode switch, and then check that “DUAL” is shown on the display. 

2. Operate the temperature control switch (driver side). Check that the discharge air temperature (driver

side) changes. 

3. Operate the temperature control switch (passenger side). Check that the discharge air temperature (pas-

senger side) changes. 

4. Press the DUAL mode switch, and then check that the temperature setting (driver/passenger) is unified to

the driver side temperature setting. 

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Refer to 

HAC-97, "Diagnosis Chart By Symptom"

 and perform the appropriate diagnosis. 

9.

CHECK AUTO MODE

1. Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2. Operate the temperature control switch (driver side). Check that the fan speed, outlet air or intake air

changes. The discharge air temperature or fan speed varies depending on the ambient temperature, in-

vehicle temperature, and temperature setting. 

Is the inspection result normal?

YES

>> Inspection End

NO

>> Refer to 

HAC-97, "Diagnosis Chart By Symptom"

 and perform the appropriate diagnosis. 

SYSTEM SETTING

HAC-55

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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SYSTEM SETTING

Temperature Setting Trimmer

INFOID:0000000009757642

Description

If the temperature felt by the customer is different than the airflow temperature controlled by the temperature

setting, the auto amplifier control temperature can be adjusted to compensate for the temperature setting. 

How to set

Using CONSULT, perform “TEMP SET CORRECT” in “WORK SUPPORT” of HVAC. 

NOTE:
• When the temperature setting is set to 25.0

°C (77°F) and −3.0°C (−6°F), the temperature controlled by auto amp is 25.0°C (77°F) −

3.0

°C (6°F) = 22.0°C (71°F) and the temperature becomes lower than the temperature setting. 

• When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the

difference between the temperature setting and control temperature may be cancelled. 

Inlet Port Memory Function (FRE)

INFOID:0000000009757643

Description

• If the ignition switch is turned to the OFF position while the FRE (

) switch is set to ON (fresh air intake),

“Perform the memory” or “Do not perform the memory” of the FRE (

) switch ON (fresh air intake) con-

dition can be selected. 

• If “Perform the memory” was set, the FRE (

) switch will be ON (fresh air intake) when turning the igni-

tion switch to the ON position again. 

• If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-

tion switch to the ON position again. 

How to set

Using CONSULT, perform “FRE MEMORY SET” in “WORK SUPPORT” of HVAC. 

NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the
FRE switch memory function may be cancelled. 

Work support items

Display (

°F)

Display (

°C)

TEMP SET CORRECT

6

3.0

5

2.5

4

2.0

3

1.5

2

1.0

1

0.5

0 (initial status)

0 (initial status)

−1

−0.5

−2

−1.0

−3

−1.5

−4

−2.0

−5

−2.5

−6

−3.0

Work support items

Display

Setting

FRE MEMORY SET

WITHOUT

Perform the memory of manual FRE

WITH (initial status)

Do not perform the memory of manual FRE (auto 
control)