Infiniti G37 Coupe. Manual — part 753

HAC-1

VENTILATION, HEATER & AIR CONDITIONER

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SECTION

HAC

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HAC

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CONTENTS

HEATER & AIR CONDITIONING CONTROL SYSTEM

AUTOMATIC AIR CONDITIONER

BASIC INSPECTION . . . . . . . . .

5

DIAGNOSIS AND REPAIR WORKFLOW . . ..

5

Work Flow . . . . . . . . . . . . . . . .....

5

INSPECTION AND ADJUSTMENT . . . . . .

6

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM . ..

6

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description & Inspection . . . . . . ..

6

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Temperature Setting Trimmer . . . .....

7

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Foot Position Setting Trimmer . . . .....

8

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Inlet Port Memory Function . . . . .....

9

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . .....

9

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Description & Inspection . . . . . . . . . .....

9

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Temperature Setting Trimmer . . . . . . . ...

11

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Foot Position Setting Trimmer . . . . . . . ...

12

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Inlet Port Memory Function . . . . . . . . ...

13

FUNCTION DIAGNOSIS . . . . . . . ..

14

COMPRESSOR CONTROL FUNCTION . . .

14

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM .

14

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description . . . . . . . . . . . .

14

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Fail-Safe . . . . . . . . . . . .

14

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Part Location . . . . . ..

15

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component’s role . . . . . . . . ...

17

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

18

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Description . . . . . . . . . . . . . . . .

18

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Fail-Safe . . . . . . . . . . . . . . . .

19

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Part Location . . . . . . . . . ..

19

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component’s role . . . . . . . . . . . . ..

21

AUTOMATIC AIR CONDITIONER SYSTEM .

23

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM .

23

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Diagram . . . . . . . . .

23

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Description . . . . . . . .

23

HAC-2

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Part Location . . . . . .

28

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Description . . . . . ....

30

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

31

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Diagram . . . . . . . . . . . . ...

31

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Description . . . . . . . . . . . ...

32

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Part Location . . . . . . . . . .

37

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Description . . . . . . . . . ....

39

CAN COMMUNICATION SYSTEM . . . . ...

41

System Description . . . . . . . . . . . . .

41

DIAGNOSIS SYSTEM (AUTO AMP.) . . . .

42

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM ...

42

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Description . . . . . . ...

42

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : CONSULT-III Function . . . . . . ..

47

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

48

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Diagnosis Description . . . . . . . . . . ...

48

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: CONSULT-III Function . . . . . . . . . . .

53

MODE DOOR CONTROL SYSTEM . . . . ..

55

System Diagram . . . . . . . . . . . . . .

55

System Description . . . . . . . . . . . . .

55

AIR MIX DOOR CONTROL SYSTEM . . . ...

57

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM ...

57

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Diagram . . . . . . . . ...

57

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Description . . . . . . . ...

57

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

58

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Diagram . . . . . . . . . . . . ...

58

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Description . . . . . . . . . . . ...

58

INTAKE DOOR CONTROL SYSTEM . . . ...

60

System Diagram . . . . . . . . . . . . . .

60

System Description . . . . . . . . . . . . .

60

BLOWER MOTOR CONTROL SYSTEM . . ..

62

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM .

62

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Diagram . . . . . . . . .

62

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Description . . . . . . . ...

62

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

63

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Diagram . . . . . . . . . . . . ...

63

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: System Description . . . . . . . . . . . ...

63

MAGNET CLUTCH CONTROL SYSTEM . . .

65

System Diagram . . . . . . . . . . . . . .

65

System Description . . . . . . . . . . . . .

65

COMPONENT DIAGNOSIS . . . . . ...

67

MODE DOOR MOTOR . . . . . . . . . ..

67

Description . . . . . . . . . . . . . . . ..

67

Component Function Check . . . . . . . . ..

67

Diagnosis Procedure . . . . . . . . . . . ...

67

AIR MIX DOOR MOTOR . . . . . . . . ...

70

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM .

70

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description . . . . . . . . . . .

70

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Function Check . . . .

70

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Procedure . . . . . . . .

70

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

71

HAC-3

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D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Description . . . . . . . . . . . . . . .

71

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Function Check . . . . . . . .

72

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Diagnosis Procedure . . . . . . . . . . . .

72

INTAKE DOOR MOTOR . . . . . . . . .

75

Description . . . . . . . . . . . . . . . ..

75

Component Function Check . . . . . . . . ..

75

Diagnosis Procedure . . . . . . . . . . . ...

75

BLOWER MOTOR . . . . . . . . . . . ..

77

WITHOUT LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM .

77

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Description . . . . . . . . . . .

77

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Function Check . . . .

77

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Diagnosis Procedure . . . . . . . .

77

WITHOUT LEFT AND RIGHT VENTILATION
TEMPERATURE SEPARATELY CONTROL
SYSTEM : Component Inspection . . . . . . ..

80

WITH LEFT AND RIGHT VENTILATION TEMPER-
ATURE SEPARATELY CONTROL SYSTEM . . ...

80

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Description . . . . . . . . . . . . . . .

80

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Function Check . . . . . . . .

81

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Diagnosis Procedure . . . . . . . . . . . .

81

WITH LEFT AND RIGHT VENTILATION TEM-
PERATURE SEPARATELY CONTROL SYSTEM
: Component Inspection . . . . . . . . . . ..

83

MAGNET CLUTCH . . . . . . . . . . . .

85

Description . . . . . . . . . . . . . . . ..

85

Component Function Check . . . . . . . . .

85

Diagnosis Procedure . . . . . . . . . . . ...

85

AMBIENT SENSOR . . . . . . . . . . ...

88

Description . . . . . . . . . . . . . . . ..

88

Component Function Check . . . . . . . . ..

88

Diagnosis Procedure . . . . . . . . . . . ...

88

Component Inspection . . . . . . . . . . .

89

IN-VEHICLE SENSOR . . . . . . . . . ...

91

Description . . . . . . . . . . . . . . . ..

91

Component Function Check . . . . . . . . ..

91

Diagnosis Procedure . . . . . . . . . . . ...

92

Component Inspection . . . . . . . . . . . .

93

SUNLOAD SENSOR . . . . . . . . . . .

94

Description . . . . . . . . . . . . . . . ...

94

Component Function Check . . . . . . . . ..

94

Diagnosis Procedure . . . . . . . . . . . ...

94

Component Inspection . . . . . . . . . . . .

95

INTAKE SENSOR . . . . . . . . . . . .

97

Description . . . . . . . . . . . . . . . ...

97

Component Function Check . . . . . . . . ..

97

Diagnosis Procedure . . . . . . . . . . . ...

97

Component Inspection . . . . . . . . . . . .

98

POWER SUPPLY AND GROUND CIRCUIT
FOR AUTO AMP. . . . . . . . . . . .

100

Description . . . . . . . . . . . . . . . .

100

Component Function Check . . . . . . . . ..

101

Diagnosis Procedure . . . . . . . . . . . .

101

ECU DIAGNOSIS . . . . . . . . . ...

102

ECM . . . . . . . . . . . . . . . . .

102

Reference Value . . . . . . . . . . . . .

102

AUTO AMP. . . . . . . . . . . . . . .

119

Reference Value . . . . . . . . . . . . .

119

Wiring Diagram - AIR CONDITIONER CONTROL
SYSTEM - . . . . . . . . . . . . . . . ..

121

Fail-Safe . . . . . . . . . . . . . . . .

127

SYMPTOM DIAGNOSIS . . . . . . .

129

AIR CONDITIONER CONTROL . . . . . ..

129

Diagnosis Chart By Symptom . . . . . . . .

129

INSUFFICIENT COOLING . . . . . . . ..

130

Description . . . . . . . . . . . . . . . .

130

Inspection procedure . . . . . . . . . . . .

130

INSUFFICIENT HEATING . . . . . . . ...

133

Description . . . . . . . . . . . . . . . .

133

Inspection procedure . . . . . . . . . . . .

133

NOISE . . . . . . . . . . . . . . . ..

135

Description . . . . . . . . . . . . . . . .

135

Inspection procedure . . . . . . . . . . . .

135

SELF-DIAGNOSIS CANNOT BE PER-
FORMED . . . . . . . . . . . . . . .

137

Description . . . . . . . . . . . . . . . .

137

Inspection procedure . . . . . . . . . . . .

137

MEMORY FUNCTION DOES NOT OPERATE .

138

Description . . . . . . . . . . . . . . . .

138

Inspection procedure . . . . . . . . . . . .

138

PRECAUTION . . . . . . . . . . .

139

PRECAUTIONS . . . . . . . . . . . ...

139

HAC-4

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" . . . . . . . . . . . . . . . .

139

Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect . . . . . . . . .

139

Precaution for Battery Service . . . . . . . ...

139

Precaution for Procedure without Cowl Top Cover ..

140

Precautions For Xenon Headlamp Service . . ...

140

Working with HFC-134a (R-134a) . . . . . . .

140

General Refrigerant Precaution . . . . . . .

141

Refrigerant Connection . . . . . . . . . . .

141

Service Equipment . . . . . . . . . . . .

145

COMPRESSOR . . . . . . . . . . . .

148

General Precautions . . . . . . . . . . . .

148

LEAK DETECTION DYE . . . . . . . . ..

149

General Precautions . . . . . . . . . . . .

149