Infiniti G37 Coupe. Manual - part 761

 

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Infiniti G37 Coupe. Manual - part 761

 

 

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-33

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

The blower speed is manually controlled with this switch. Seven speeds are available for manual control (as
shown on the display screen).

OFF Switch

Compressor and blower are OFF, intake doors and the mode doors are automatically controlled.

Rear Window Defogger Switch

When illumination is ON, rear window is defogged.

Intake Switch

• When intake switch is ON, FRE LED turns ON, and air inlet is fixed to FRE.
• When intake switch is pressed again, REC LED turns ON, and air inlet is fixed to REC.
• When intake switch is pressed for approximately 1.5 seconds or longer, FRE and REC LEDs blink twice.

Then, automatic control mode is entered. Inlet status is displayed by LED even during automatic controlled.

• When FRE LED is turned ON, shifting mode position to D/F or DEF, or when compressor is turned from ON

to OFF, intake switch is automatically turned OFF (fixed to FRE mode). REC mode can be re-entered by
pressing intake switch again, and then compressor is turned ON. (Except D/F or DEF position)

DUAL Switch

• When the DUAL switch indicator is illuminated, the driver side and passenger side, temperature can each be

set independently.

• When the DUAL switch indicator is not illuminated, the driver side outlet and setting temperature is applied

to both sides.

HAC-34

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

DISCHARGE AIR FLOW

JSIIA0661GB

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-35

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

SWITCHES AND THEIR CONTROL FUNCTION

AIR CONDITIONER LAN CONTROL SYSTEM

The LAN (Local Area Network) system consists of unified meter and A/C amp., mode door motor, air mix door
motors and intake door motor.

JSIIA0664GB

JSIIA0665GB

HAC-36

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

A configuration of these components is as shown in the figure below.

SYSTEM CONSTRUCTION

A small network is constructed between the unified meter and A/C amp., mode door motor, air mix door
motors and intake door motor. The unified meter and A/C amp. and motors are connected by data transmis-
sion lines and motor power supply lines. The LAN network is built through the ground circuits of each door
motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the mode door motor, the air mix door motors and the
intake door motor.
• Address
• Motor opening angle signals
• Data transmission
• Motor stop and drive decision
• Opening angle sensor (PBR function)
• Comparison
• Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)

Operation

The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCUs and intake door motor LCU.
The mode door motor, air mix door motors and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors is compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data is returned to the unified meter and A/C amp.

Transmission Data and Transmission Order

Unified meter and A/C amp. data is transmitted consecutively to each of the doors motor following the form as
shown in the figure below.

JSIIA0769GB

RJIA1747E

RJIA1748E

 

 

 

 

 

 

 

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