Infiniti G35 (V35). Manual — part 90
AIR CONDITIONER CONTROL
ATC-31
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ATC
MAGNET CLUTCH CONTROL
When A/C switch, AUTO.ECON switch or DEF switch is pressed, display and A/C auto amp. transmits com-
pressor ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns A/C relay ON to operate compressor.
When sending compressor ON signal to IPDM E/R via CAN communication, ECM simultaneously sends com-
pressor feedback signal to meter control unit via CAN communication.
Meter control unit sends compressor feedback signal to display and A/C auto amp., then, uses input compres-
sor feedback signal to control air inlet.
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the display and A/C auto amp. to quickly locate the cause of malfunc-
tions.
RJIA1628E
ATC-32
AIR CONDITIONER CONTROL
Description of Control System
NJS0002Z
The control system consists of input sensors, switches, the display and A/C auto amp. (microcomputer) and
outputs. The relationship of these components is shown in the figure below:
Control Operation
NJS00030
RJIA3478E
RJIA3479E
AIR CONDITIONER CONTROL
ATC-33
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ATC
DISPLAY SCREEN
The operation status of the system is displayed on the screen.
AUTO.ECON SWITCH
●
The compressor, intake doors, air mix doors, mode doors and blower speed are automatically controlled
so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the
operator.
●
When pressing AUTO.ECON switch, air inlet, air outlet, fan speed, and discharge air temperature are
automatically controlled. (Inlet is automatically controlled only when FRE or REC switch is OFF.)
●
Press AUTO.ECON switch again. “ECON” appears on display and control is switched to economy control.
TEMPERATURE CONTROL DIAL (POTENTIO TEMPERATURE CONTROL)
The set temperature is increased or decreased with this dial.
RECIRCULATION (REC) SWITCH
●
When REC switch is ON, REC switch LED turns ON, air inlet is fixed to REC, and compressor will turn
ON.
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When REC switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
LEDs blink twice. Then, automatic control mode is entered. Inlet status is displayed even during automat-
ically controlled.
●
When FRE switch is turned ON, air outlet switches to D/F or DEF position, or when compressor is turned
from ON to OFF, REC switch is automatically turned OFF (fixed to FRE mode).
FRESH (FRE) SWITCH
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When FRE switch is ON, FRE switch LED turns ON, and air inlet is fixed to FRE.
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When FRE switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
LEDs blink twice. Then, automatic control mode is entered. Inlet status is displayed even during automat-
ically controlled.
●
When REC switch is turned ON, FRE switch is automatically turned OFF (fixed to REC mode). FRE mode
can be re-entered by pressing FRE switch again.
DEFROSTER (DEF) SWITCH
Mode doors are set to the defrost position with this switch. Also, intake doors are set to the outside air position,
and compressor turns ON.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
OFF SWITCH
Compressor and blower are OFF, intake doors are automatically controlled, and mode doors are set to the foot
position.
A/C SWITCH
Compressor is ON or OFF with this switch.
(Pressing the A/C switch when the A/C switch is ON, will turn OFF the A/C switch and compressor.)
MODE SWITCH
The air discharge outlets is controlled by this switch.
When air outlet switches to D/F or DEF position, compressor will turn ON and fixed to FRE mode.
FAN SWITCHES
The blower speed is manually controlled with this switch. Seven speeds are available for manual control (as
shown on the display screen).
DUAL SWITCH (WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM)
●
When air conditioner system is operating and DUAL switch is pressed, only underlined portion of driver’s
seat set temperature indication on display (left-hand side) turns ON (and display shows “DRIVER”). Then,
changing set temperature for driver’s seat is possible using temperature control dial.
ATC-34
AIR CONDITIONER CONTROL
●
When DUAL switch is pressed again, only underlined portion of passenger’s seat set temperature indica-
tion on display (right-hand side) turns ON (and display shows “PASSENGER”). Then, changing set tem-
perature for passenger’s seat is possible using temperature control dial.
●
When DUAL switch is pressed again, underlined portions of both seats set temperature indications turn
ON (and display shows “DRIVER” and “PASSENGER”). Set temperatures for left and right can be set
equal to temperature for driver’s seat, with temperature control dial.
Fail-safe Function
NJS00031
If a communication error exists between display and A/C auto amp. and A/C and audio controller for 30 sec-
onds or longer, air conditioner is controlled under the following conditions:
Compressor
: ON
Air outlet
: AUTO
Air inlet
: FRE (Fresh)
Blower fan speed
: AUTO
Set temperature
: Setting before communication error occurs
Display
: OFF
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