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MODE DOOR CONTROL SYSTEM
HAC-29
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Mode position can be selected manually by pressing the MODE
switch or the DEF switch on the A/C control. This the setting of a
mode position. Pressing the AUTO switch allows automatic control
by the A/C auto amp. During the automatic control of a mode posi-
tion, a mode door position (VENT, B/L, FOOT, or D/F) is selected
based on a target the air mix door opening angle and sunload
depending on the temperature calculated by the A/C auto amp. In
addition, the D/F is selected to prevent windshield fogging only when
ambient temperature is extremely low with mode position the FOOT.
JPIIA0767GB
Page 2658 of 5121
![NISSAN TEANA 2008 Service Manual HAC-30
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
AIR MIX DOOR CONTROL SYSTEM
AIR MIX DOOR CONTROL SYSTEM
System DiagramINFOID:0000000003846311
System DescriptionINFOID:0000000003846312
The air mi NISSAN TEANA 2008 Service Manual HAC-30
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AIR MIX DOOR CONTROL SYSTEM
AIR MIX DOOR CONTROL SYSTEM
System DiagramINFOID:0000000003846311
System DescriptionINFOID:0000000003846312
The air mi](/manual-img/5/57391/w960_57391-2657.png)
HAC-30
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AIR MIX DOOR CONTROL SYSTEM
AIR MIX DOOR CONTROL SYSTEM
System DiagramINFOID:0000000003846311
System DescriptionINFOID:0000000003846312
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, intake temperature and amount of sunload.
SYSTEM OPERATION
The A/C auto amp. receives data from each of the sensors.
The A/C auto amp. sends air mix door, the mode door and the intake door opening angle data to the air mix
door motor LCUs, the mode door motor LCU and the intake door motor LCU.
The air mix door motors, the mode door motor and the intake door motor read their respective signals
according to the address signal. Opening angle indication signals received from the A/C auto amp. and each
of the motor position sensors are compared by the LCUs in each door motor with the existing decision and
opening angles.
Next, HOT/COLD, DEF/VENT, OPEN/SHUT or FRE/REC operation is selected. The newly selected data is
returned to the A/C auto amp.
Door Motor Circuit
Air Mix Door Control Specification
JPIIA0498GB
JSIIA1133GB
Page 2659 of 5121
AIR MIX DOOR CONTROL SYSTEM
HAC-31
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When ignition switch is ON, the A/C auto amp. continuously and
automatically controls temperatures regardless of air conditioner
operational condition. When setting a target temperature with the
temperature control switch, the A/C auto amp. corrects the set tem-
perature and decides a target air mix door opening angle. The A/C
auto amp. controls air mix door according to the target air mix door
opening angle and current air mix door opening angle, keeping an
optimum air mix door opening angle. When the temperature is set at
18°C (60°F), air mix door is set on full cold, and when the tempera-
ture is set at 32°C (90°F), it is set to full hot.
JPIIA0633GB
Page 2660 of 5121
HAC-32
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INTAKE DOOR CONTROL SYSTEM
INTAKE DOOR CONTROL SYSTEM
System DiagramINFOID:0000000003846313
System DescriptionINFOID:0000000003846314
The intake door is automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
SYSTEM OPERATION
The intake door control judges intake door position based on the ambient temperature, the intake air tempera-
ture and the in-vehicle temperature. When the DEF or OFF switches are pressed, the A/C auto amp. sets the
intake door to the FRE position.
Door Motor Circuit
Intake Door Control Specification
JPIIA0887GB
JSIIA1133GB
Page 2661 of 5121
INTAKE DOOR CONTROL SYSTEM
HAC-33
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Intake door position is basically set to the FRE when the FRE indi-
cator is ON or DEF switch is ON.
Intake door position is basically set to the REC when the REC indi-
cator is ON.
The intake door automatic control selects the FRE, the 20% FRE,
or the REC depending on the target air mix door opening angle,
based on in-vehicle temperature, ambient temperature, and sun-
load.
JPIIA0634GB
Page 2662 of 5121
![NISSAN TEANA 2008 Service Manual HAC-34
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BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DiagramINFOID:0000000003846315
System DescriptionINFOID:0000000003846316
Blower spe NISSAN TEANA 2008 Service Manual HAC-34
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DiagramINFOID:0000000003846315
System DescriptionINFOID:0000000003846316
Blower spe](/manual-img/5/57391/w960_57391-2661.png)
HAC-34
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BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DiagramINFOID:0000000003846315
System DescriptionINFOID:0000000003846316
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
By pressing the AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
SYSTEM OPERATION
System Operation
For air flow, the manual selection (1-7) with the fan control dial has priority.
If the AUTO switch is pressed or if the DEF switch is pressed while in the OFF condition, it changes to the
automatic control by A/C auto amp.
When increasing the air flow, it changes the duty ratio of the blower motor drive signal to prevent the air flow
from suddenly increasing.
There are the following types of air flow control: starting air flow control, starting air flow control at low cool-
ant temperature, starting air flow control at high in-vehicle temperature, and air flow control at actuator oper-
ation in addition to manual control, normal automatic air flow control.
Normal Automatic Air Flow Control
When the target temperature is set by the temperature control switch of A/C control, the A/C auto amp. per-
forms the calculation and decides the target according to the signal from each sensor.
The A/C auto amp. changes the duty ratio of blower motor drive signal and controls the air flow continuously
so that the air flow becomes the target air flow.
The minimum air flow will change according to the sunload when the air discharge outlet is VENT or B/L.
Fan Speed Control Specification
JPIIA0502GB
JPIIA0635GB
Page 2663 of 5121
![NISSAN TEANA 2008 Service Manual BLOWER MOTOR CONTROL SYSTEM
HAC-35
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When starting the automatic control of air flow, the syst NISSAN TEANA 2008 Service Manual BLOWER MOTOR CONTROL SYSTEM
HAC-35
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When starting the automatic control of air flow, the syst](/manual-img/5/57391/w960_57391-2662.png)
BLOWER MOTOR CONTROL SYSTEM
HAC-35
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When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower
motor drive signal to prevent too much air from blowing.
The time period from when the air flow changes from LO to HI is approximately 8 seconds.
It becomes the starting air flow control at low coolant temperature according to the calculation result of the A/
C auto amp. and engine coolant temperature [approximately 56°C (133°F) or less] during the automatic air
flow control.
Do not perform the starting air flow control when the air discharge outlet is set to DEF.
Starting Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In cold start up condition where the engine coolant temperature is below 56°C (133°F), the blower does not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient temperature and engine coolant temperature.
In the most extreme case (very low ambient temperature) the blower start delay is 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56°C (133°F), and then the blower speed increases to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed rises gradu-
ally to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
Page 2664 of 5121
![NISSAN TEANA 2008 Service Manual HAC-36
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
System DiagramINFOID:0000000003846317
System DescriptionINFOID:0000000003846318
The A/C NISSAN TEANA 2008 Service Manual HAC-36
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
System DiagramINFOID:0000000003846317
System DescriptionINFOID:0000000003846318
The A/C](/manual-img/5/57391/w960_57391-2663.png)
HAC-36
< FUNCTION DIAGNOSIS >[WITHOUT 7 INCH DISPLAY]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
System DiagramINFOID:0000000003846317
System DescriptionINFOID:0000000003846318
The A/C auto amp. controls compressor operation by ambient temperature, intake air temperature and signal
from ECM.
SYSTEM OPERATION
When the A/C switch, the AUTO switch, or the DEF switch is pressed, A/C auto amp. transmit the A/C switch
signal and blower fan motor switch signal to the 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 the ECM judges that the compressor can be turned ON, it sends A/C com-
pressor request signal to the IPDM E/R, via CAN communication.
Upon receipt of A/C compressor request signal from the ECM, the IPDM E/R turns the A/C relay ON to oper-
ate the compressor.
When sending A/C compressor request signal to the IPDM E/R via CAN communication line, the ECM simul-
taneously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.
The ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feed-
back signal to control air inlet.
Compressor Protection Control
The ECM makes the A/C relay turn OFF and stops the compressor when pressure on the high-pressure side
detected by the refrigerant pressure sensor is over approximately 3,119 kPa (31.19bar, 31.8 kg/cm
2, 452 psi),
or below approximately 118 kPa (1.18bar, 1.2 kg/cm
2, 17 psi).
Low Temperature Protection Control
Turn the A/C relay to OFF and stop the compressor by the signal from the A/C auto amp according to the
evaporator passing air temperature detected by the intake sensor and the ambient temperature detected by
the ambient sensor.
JPIIA0504GB