Infiniti G37 Coupe. Manual - part 782

ECM

HAC-117

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

110

(R)

128

(B)

Engine speed output sig-
nal

Output

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle

1V

[Engine is running]
• Engine speed is 2,000 rpm

1V

111

(O)

116

(P)

Sensor power supply
(Refrigerant pressure 
sensor)

—

[Ignition switch: ON]

5V

112

(SB)

—

Sensor ground
(EVAP control system 
pressure sensor)

—

—

—

113

(P)

—

CAN communication line

Input/

Output

—

—

114

(L)

—

CAN communication line

Input/

Output

—

—

116

(P)

—

Sensor ground
(Refrigerant pressure 
sensor)

—

—

—

117

(V)

128

(B)

Data link connector

Input/

Output

[Ignition switch: ON]
• GST: Disconnected

5V - BATTERY VOLTAGE (11 - 
14V)

121

(LG)

128

(B)

EVAP canister vent con-
trol valve

Output

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

122

(P)

128

(B)

Stop lamp switch

Input

[Ignition switch: OFF]
• Brake pedal: Fully released

0V

[Ignition switch: OFF]
• Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

123

(B)

124

(B)

—

ECM ground

—

—

—

125

(R)

128

(B)

Power supply for ECM

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

126

(BR)

128

(B)

ICC brake switch (mod-
els with ICC system)
ASCD brake switch 
(models with ASCD sys-
tem)

Input

[Ignition switch: ON]
• Brake pedal: Slightly depressed

0V

[Ignition switch: ON]
• Brake pedal: Fully released

BATTERY VOLTAGE
(11 - 14V)

127

(B)

128

(B)

—

ECM ground

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

-–

Signal  name

Input/

Output

JMBIA0076GB

JMBIA0077GB

HAC-118

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECM

*1: This may vary depending on internal resistance of the tester.

**2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-3, "How to Handle Battery"

.

AUTO AMP.

HAC-119

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AUTO AMP.

Reference Value

INFOID:0000000001675737

TERMINAL LAYOUT

PHYSICAL VALUES

JSIIA0097ZZ

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

38

(L)

Ground

Blower motor control signal

 Output

• Ignition switch ON
• Blower speed: 1st speed 

(manual)

41

(V)

Ground

Power supply from ACC

—

Ignition switch ACC

Battery voltage

43

(R)

Ground

Intake sensor

Input

—

—

44

(LG)

Ground

In-vehicle sensor

Input

—

—

45

(P)

Ground

Ambient sensor

Input

—

—

46

(O)

Ground

Sunload sensor

Input

—

—

53

(G)

Ground

Power supply from IGN

—

Ignition switch ON

Battery voltage

54

(Y)

Ground

Power supply from BAT

—

Ignition switch OFF

Battery voltage

55

(B)

Ground

Ground

—

Ignition switch ON

0 V

59

(GR)

Ground

Intake sensor ground

—

—

0 V

60

(L)

Ground

In-vehicle sensor ground

—

Ignition switch ON

0 V

61

(BR)

Ground

Ambient sensor ground

—

Ignition switch ON

0 V

62

(SB)

Ground

Sunload sensor ground

—

Ignition switch ON

0 V

JSIIA0096ZZ

HAC-120

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTO AMP.

65

(O)

Ground

ECV (Electrical Control 
Valve) signal

Output

• Ignition switch ON
• Self-diagnosis. STEP-4

(Code No. 45)

69

(L)

Ground

A/C LAN signal

Input/

Output

Ignition switch ON

70

(R)

Ground

Power supply for each door 
motor

Output

Ignition switch ON

Battery voltage

71

(B)

Ground

Ground

—

Ignition switch ON

 0 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

SJIA1607E

SJIA1453J