Infiniti G35 (V35) Sedan. Manual - part 783

 

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Infiniti G35 (V35) Sedan. Manual - part 783

 

 

HAC-104

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE SENSOR

After disconnecting intake sensor (1) connector M77, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to table
below.

If NG, replace intake sensor.

Temperature 

°

C (

°

F)

Resistance k

15 (5)

12.34

10 (14)

9.62

5 (23)

7.56

0 (32)

6.00

5 (41)

4.80

10 (50)

3.87

15 (59)

3.15

20 (68)

2.57

25 (77)

2.12

30 (86)

1.76

35 (95)

1.47

40 (104)

1.23

45 (113)

1.04

JSIIA0053ZZ

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

HAC-105

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

Description

INFOID:0000000000959968

COMPONENT DESCRIPTION

Unified Meter and A/C Amp. (Automatic Amplifier)

The unified meter and A/C amp. (1) has a built-in microcomputer
which processes information sent from various sensors needed for
air conditioner operation. The air mix door motor(s), mode door
motor, intake door motor, blower motor and compressor are then
controlled.
When the various switches and temperature control dial are oper-
ated, data is input to the unified meter and A/C amp. from the AV
control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.

Power Supply and Ground Circuit for Unified Meter and A/C Amp.

Potentio Temperature Control (PTC)

The PTC (1) is built into the preset switch. It can be set at an interval of 0.5

°

C (1.0

°

F) in the 18

°

C (60

°

F) to

32

°

C (90

°

F) temperature range by turning temperature control dial. The set temperature is displayed.

Without left and right ventilation temperature separately system

With left and right ventilation temperature separately system

Component Function Check

INFOID:0000000000959969

JSIIA0014GB

RJIA4049E

JSIIA0135ZZ

JSIIA0020GB

HAC-106

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press AUTO switch and A/C switch.

2.

Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).
(Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)

Does magnet clutch engaged?

YES

>> END.

NO

>> Go to Diagnosis Procedure. Refer to 

HAC-106, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000000959970

1.

CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Disconnect unified meter and A/C amp. connector.

2.

Check voltage between unified meter and A/C amp. harness connector M67 terminals 41, 53 and 54 and
ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

Check 10A fuses [Nos. 3, 6 and 19, located in the fuse block (J/B)]. Refer to 

PG-93, "Fuse, Connector and Ter-

minal Arrangement"

.

Is the inspection result normal?

YES

>> Check harness for open circuit. Repair or replace if necessary.

NO

>> Check harness for short circuit and replace fuse.

3.

CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

Check continuity between unified meter and A/C amp. harness connector M67 terminal 55, 71 and
ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK PRESET SWITCH

Check preset switch. Refer to 

AV-105, "Symptom Table"

 (BASE AUDIO WITHOUT NAVIGATION), 

AV-285,

"Symptom Table"

 (BOSE AUDIO WITHOUT NAVIGATION) or 

AV-514, "Symptom Table"

 (BOSE AUDIO WITH

NAVIGATION).

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair or replace malfunctioning part(s).

(+)

(-)

Ignition switch position

Unified meter and A/C amp.

OFF

ACC

ON

Connector

Terminal

M67

41

Ground

Approx. 0 V

Battery voltage

Battery voltage

53

Approx. 0 V

Approx. 0 V

Battery voltage

54

Battery voltage

Battery voltage

Battery voltage

(+)

(

)

Continuity

Unified meter and A/C amp.

Connector

Terminal

M67

55

Ground

Continuity should exist

71

AUTO AMP.

HAC-107

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS

AUTO AMP.

Reference Value

INFOID:0000000000959971

VALUES ON THE DIAGNOSIS TOOL

Display Item List

TERMINAL LAYOUT

PHYSICAL VALUES

Monitor Item

Condition

Value/Status

IGN ON SW

Ignition switch OFF 

 ON

OFF 

 ON

FAN ON SIG

Ignition switch ON

Blower fan motor switch ON

ON

Blower fan motor switch OFF

OFF

AIR COND SW

Ignition switch ON

Compressor ON

ON

Compressor OFF

OFF

REFRIGERANT PRESSURE 
SENSOR

• Engine is running
• Warm-up condition
• Both A/C switch and blower fan motor switch: ON (Compressor 

operates)

1.0 - 4.0 V

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

JSIIA0096ZZ

 

 

 

 

 

 

 

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