Infiniti EX35. Manual - part 931

HAC-120

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECM

101

Ground

SB

ICC steering switch
(models with ICC sys-
tem)

Input

[Ignition switch: ON]
• ICC steering switch: OFF

4.3V

[Ignition switch: ON]
• MAIN switch: Pressed

0V

[Ignition switch: ON]
• CANCEL switch: Pressed

1.3V

[Ignition switch: ON]
• RESUME/ACCELERATE 

switch: Pressed

3.7V

[Ignition switch: ON]
• SET/COAST switch: Pressed

3V

[Ignition switch: ON]
• DISTANCE switch: Pressed

2.2V

101

Ground

SB

ASCD steering switch
(models with ASCD sys-
tem)

Input

[Ignition switch: ON]
• ASCD steering switch: OFF

4V

[Ignition switch: ON]
• MAIN switch: Pressed

0V

[Ignition switch: ON]
• CANCEL switch: Pressed

1V

[Ignition switch: ON]
• RESUME/ACCELERATE 

switch: Pressed

3V

[Ignition switch: ON]
• SET/COAST switch: Pressed

2V

102

Ground

LG

EVAP control system 
pressure sensor

Input

[Ignition switch: ON]

1.8 - 4.8V

103

Ground

G

Sensor power supply
(Accelerator pedal posi-
tion sensor 2)

—

[Ignition switch: ON]

5V

104

Ground

GR

Sensor ground
(Accelerator pedal posi-
tion sensor 2)

—

[Ignition switch: ON]
• Warm-up condition
• Idle speed

0V

105

Ground

L

Refrigerant pressure 
sensor

Input

[Engine is running]
• Warm-up condition
• Both A/C switch and blower fan 

motor switch: ON (Compressor 
operates)

1.0 - 4.0V

106

Ground

W

Fuel tank temperature 
sensor

Input

[Engine is running]

0 - 4.8V
Output voltage varies with fuel 
tank temperature.

107

Ground

BR

Sensor power supply
(EVAP control system 
pressure sensor)

—

[Ignition switch: ON]

5V

108

Ground

Y

Sensor ground
(ASCD/ICC steering 
switch)

—

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

0V

109

Ground

G (A/

T)

BR 

(M/T)

PNP switch

Input

[Ignition switch: ON]
• Selector lever: P or N (A/T), Neu-

tral (M/T)

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]
• Selector lever: Except above

0V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

ECM

HAC-121

< 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.)

*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"

.

110

Ground

R

Engine speed output sig-
nal

Output

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

NOTE:
The pulse cycle changes de-
pending on rpm at idle

1V

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

1V

111

Ground

O

Sensor power supply
(Refrigerant pressure 
sensor)

—

[Ignition switch: ON]

5V

112

Ground

V

Sensor ground
(EVAP control system 
pressure sensor)

—

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

0V

113

Ground

P

CAN communication line

Input/

Output

—

—

114

Ground

L

CAN communication line

Input/

Output

—

—

116

Ground

W

Sensor ground
(Refrigerant pressure 
sensor)

—

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

0V

117

Ground

V

Data link connector

Input/

Output

[Ignition switch: ON]
• GST: Disconnected

5V - BATTERY VOLTAGE (11 - 
14V)

121

Ground

LG

EVAP canister vent con-
trol valve

Output

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

122

Ground

P

Stop lamp switch

Input

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

0V

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

BATTERY VOLTAGE
(11 - 14V)

123
124

Ground

B
B

ECM ground

—

[Engine is running]
• Idle speed

Body ground

125

Ground

R

Power supply for ECM

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

126

Ground

BR

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
128

Ground

B
B

ECM ground

—

[Engine is running]
• Idle speed

Body ground

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

JMBIA0076GB

JMBIA0077GB

HAC-122

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTO AMP.

AUTO AMP.

Reference Value

INFOID:0000000003545646

TERMINAL LAYOUT

PHYSICAL VALUES

JSIIA0097ZZ

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

38

(P)

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

AUTO AMP.

HAC-123

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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