Infiniti G37 Coupe. Manual - part 754

DIAGNOSIS AND REPAIR WORKFLOW

HAC-5

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

C

D

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G

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HAC

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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DETAILED FLOW

1.

LISTEN TO CUSTOMER COMPLAINT

Listen to customer complaint. (Get detailed information about the conditions and environment when the symp-
tom occurs.)

>> GO TO 2.

2.

VERIFY THE SYMPTOM WITH OPERATIONAL CHECK

Verify the symptom with operational check. Refer to 

HAC-6, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (Without left and right venti-

lation temperature separately control system) or 

HAC-9, "WITH LEFT AND RIGHT VENTILATION TEMPERA-

TURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (With left and right ventilation

temperature separately control system).

>> GO TO 3.

3.

GO TO APPROPRIATE TROUBLE DIAGNOSIS

Go to appropriate trouble diagnosis (Refer to 

HAC-129, "Diagnosis Chart By Symptom"

 below).

>> GO TO 4.

4.

REPAIR OR REPLACE

Repair or replace the specific parts.

>> GO TO 5.

5.

FINAL CHECK

Final check.

Is the inspection result normal?

YES

>> CHECK OUT

NO

>> GO TO 3.

HAC-6

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

INSPECTION AND ADJUSTMENT

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Description & Inspection

INFOID:0000000001675663

DESCRIPTION

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

INSPECTION PROCEDURE

Memory Function

1.

Turn temperature control dial clockwise until 32

°

C (90

°

F) is displayed.

2.

Press OFF switch.

3.

Turn ignition switch OFF.

4.

Turn ignition switch ON.

5.

Press AUTO switch.

6.

Confirm that the set temperature remains at previous temperature.

7.

Press OFF switch.

If NG, go to trouble diagnosis procedure for 

HAC-138, "Inspection procedure"

.

If OK, continue the check.

Blower

1.

Turn fan control dial clockwise. Blower should operate on low speed. The fan symbol should have one
blade lit.

2.

Turn fan control dial clockwise again, and continue checking blower speed and fan symbol until all speeds
are checked.

3.

Leave blower on max. speed.

If NG, go to trouble diagnosis procedure for 

HAC-77, "WITHOUT LEFT AND RIGHT VENTILATION TEMPER-

ATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure"

.

If OK, continue the check.

Discharge Air

1.

Press MODE switches and DEF switch.

2.

Each position indicator should change shape.

3.

Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-23, "WITHOUT

LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : System
Description"

.

Conditions

: Engine running at normal operating temperature

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INSPECTION AND ADJUSTMENT

HAC-7

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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HAC

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If NG, go to trouble diagnosis procedure for 

HAC-67, "Diagnosis Procedure"

.

If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at FRE
when the D/F or DEF is selected.

Intake Air

1.

Press intake switch. Recirculation indicator should illuminate.

2.

Press intake switch again. Fresh indicator should illuminate.

3.

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

If NG, go to trouble diagnosis procedure for 

HAC-75, "Diagnosis Procedure"

.

If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at FRE
when the D/F or DEF is selected.

Temperature Decrease

1.

Turn temperature control dial counterclockwise until 18

°

C (60

°

F) is displayed.

2.

Check for cold air at discharge air outlets.

If NG, go to trouble diagnosis procedure for 

HAC-130, "Inspection procedure"

.

If OK, continue the check.

Temperature Increase

1.

Turn temperature control dial clockwise until 32

°

C (90

°

F) is displayed.

2.

Check for warm air at discharge air outlets.

If NG, go to trouble diagnosis procedure for 

HAC-133, "Inspection procedure"

.

If OK, continue the check.

A/C Switch

1.

Press AUTO switch and A/C switch.

2.

A/C switch indicator will turn ON.
• Confirm that the compressor clutch engages (sound or visual inspection).

Auto Mode

1.

Press AUTO switch and A/C switch.

2.

Display should indicate AUTO.
• Confirm that discharge air and blower speed depend on ambient, in-vehicle, and set temperatures.

If NG, go to trouble diagnosis procedure for 

HAC-101, "Diagnosis Procedure"

, then if necessary, trouble diag-

nosis procedure for 

HAC-85, "Diagnosis Procedure"

.

Go to Incident Simulation Tests in 

GI-34, "Work Flow"

 and perform tests as outlined to simulate driving condi-

tions environment. If all operational checks are OK (symptom cannot be duplicated). Refer to 

HAC-129, "Diag-

nosis Chart By Symptom"

 and perform applicable trouble diagnosis procedures if symptom appears.

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Temperature Setting Trimmer

INFOID:0000000001733705

DESCRIPTION

The trimmer compensates for differences in range of 

±

3

°

C (

±

6

°

F) between temperature setting (displayed dig-

itally) and temperature felt by customer.

Operating procedures for this trimmer are as per the following:

1.

Begin self-diagnosis STEP-5 mode. Refer to 

HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

.

2.

Turn fan control dial clockwise to set system in auxiliary mode.

3.

Display shows “61” in auxiliary mechanism. It takes approximately 3 seconds to enable setting operation.

4.

Turn temperature control dial as desired. Temperature will change at a rate of 0.5

°

C (1.0

°

F) each time a

dial is turned.

CAUTION:

• A decimal point is not indicated on the display.

HAC-8

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

• Negative value is not displayed on the display.

NOTE:
When battery cable is disconnected or battery voltage is below 10 V, trimmer operation is canceled. Tempera-
ture set becomes that of initial condition, i.e. 0

°

C (0

°

F).

WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Foot Position Setting Trimmer

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DESCRIPTION

Wind distribution ratio in FOOT mode can be set.

Operating procedures for this trimmer are as per the following:

1.

Begin self-diagnosis STEP-5 mode. Refer to 

HAC-42, "WITHOUT LEFT AND RIGHT VENTILATION

TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"

.

2.

Turn fan control dial clockwise to set system in auxiliary mode.

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