NISSAN TEANA 2008 Service Manual

COMPRESSOR CONTROL FUNCTION
HAC-13
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Fail-SafeINFOID:0000000003901219
FAIL-SAFE FUNCTION
If a communication error exists between the A/C auto amp. and A/C control for 30 seconds or longer, air con-
ditioner is controlled under the following conditions:
Component Part LocationINFOID:0000000003846299
ENGINE COMPARTMENT
Compressor : ON
Air outlet : AUTO
Air inlet : FRE (Fresh)
Blower fan speed : AUTO
Set temperature : Setting before communication error occurs

HAC-14
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COMPRESSOR CONTROL FUNCTION
PASSENGER COMPARTMENT
1. Refrigerant pressure sensor 2. Compressor (magnet clutch) 3. Ambient sensor
JPIIA0992ZZ

COMPRESSOR CONTROL FUNCTION
HAC-15
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Component’s RoleINFOID:0000000003846300
1. Intake door motor 2. Air mix door motor (passenger side) 3. Air mix door motor (driver side)
4. Mode door motor 5. Sunload sensor 6. In-vehicle sensor
7. A/C auto amp. 8. Intake sensor 9. Blower motor
JPIIA0997ZZ

HAC-16
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COMPRESSOR CONTROL FUNCTION
Component Description
Refrigerant pressure sensorEC-348, "
Description"
CompressorHAC-72, "Description"
Ambient sensorHAC-44, "Description"
Intake door motorHAC-63, "Description"
Air mix door motor (driver side)HAC-56, "Description"
Air mix door motor (passenger side)HAC-58, "Description"
Mode door motorHAC-60, "Description"
Sunload sensorHAC-53, "Description"
In-vehicle sensorHAC-47, "Description"
A/C auto amp. HAC-67, "Description"
Intake sensorHAC-50, "Description"
Blower motorHAC-68, "Description"

AUTOMATIC AIR CONDITIONER SYSTEM
HAC-17
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AUTOMATIC AIR CONDITIONER SYSTEM
System DiagramINFOID:0000000003846301
CONTROL SYSTEM
The control system consists of input sensors, switches, the A/C auto amp. (microcomputer) and outputs. The
relationship of these components is as shown in the figure below:
System DescriptionINFOID:0000000003846302
CONTROL OPERATION
Display
The operation status of the system is displayed on the screen.
JPIIA0878GB
JPIIA0879ZZ

HAC-18
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AUTOMATIC AIR CONDITIONER SYSTEM
A/C Control
MODE Switch
The air discharge outlets are controlled with this switch.
Temperature Control Switch (Driver Side)
The set temperature is increased or decreased with this switch.
Temperature Control Switch (Passenger Side)
 The set temperature is increased or decreased with this switch.
 When the temperature control switch is pressed, DUAL switch indicator is turned ON.
AUTO Switch
 The compressor, intake door, 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 the AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automati-
cally controlled.
Defroster (DEF) Switch
Mode doors are set to the defrost position with this switch. Also, intake door is set to the outside air position,
and compressor turns ON.
A/C Switch
Compressor turns ON or OFF with this switch.
(Pressing the A/C switch when the A/C switch is ON turns OFF the A/C switch and compressor.)
Fan Control Dial
The blower speed is manually controlled with this dial. Seven speeds are available for manual control (as
shown on the display screen).
OFF Switch
Compressor and blower turn OFF, air inlet sets to FRE, and mode the position is set to foot position.
Rear Window Defogger Switch
When indicator is ON, rear window is defogged.
Recirculation (REC) Switch
 When REC switch is ON, REC switch indicator turns ON, and air inlet is fixed to REC.
 When REC switch is pressed for approximately 1.5 seconds or longer, REC and FRE switch indicators blink
twice. Then, automatic control mode is entered. Inlet status is displayed even during automatic control.
 When FRE switch is turned ON, REC switch is automatically turned OFF (fixed to FRE mode). REC mode
can be re-entered by pressing REC switch again.
JPIIA0883ZZ
1.Temperature control switch (passen-
ger side)2. MODE switch 3. Recirculation (REC) switch
4. Fan control dial 5. Defroster (DEF) switch 6. AUTO switch
7.Temperature control switch (driver
side)8. A/C switch 9. Rear window defogger switch
10. OFF switch 11. Fresh (FRE) switch 12. DUAL switch

AUTOMATIC AIR CONDITIONER SYSTEM
HAC-19
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P Fresh (FRE)Switch
 When FRE switch is ON, FRE switch indicator turns ON, and air inlet is fixed to FRE.
 When FRE switch is pressed for approximately 1.5 seconds or longer, REC and FRE switch indicators blink
twice. Then, automatic control mode is entered. Inlet status is displayed even during automatic control.
 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.
DUAL Switch
 When the DUAL switch indicator is ON, the driver side and passenger side, temperature can each be set
independently.
 When the DUAL switch indicator is OFF, the driver side setting temperature is applied to both sides.

HAC-20
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AUTOMATIC AIR CONDITIONER SYSTEM
DISCHARGE AIR FLOW
JPIIA1012GB

AUTOMATIC AIR CONDITIONER SYSTEM
HAC-21
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AIR DISTRIBUTION
SWITCHES AND THEIR CONTROL FUNCTION
JPIIA0877GB
JPIIA0885GB

HAC-22
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AUTOMATIC AIR CONDITIONER SYSTEM
AIR CONDITIONER LAN CONTROL SYSTEM
The LAN (Local Area Network) system consists of the A/C auto amp., the mode door motor, the air mix door
motors and the intake door motor.
A configuration of these components is as shown in the figure below.
SYSTEM CONSTRUCTION
A small network exists between the A/C auto amp., the mode door motor, the air mix door motor and the intake
door motor. The A/C auto amp. and motors are connected by data transmission 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 A/C auto 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
JSIIA1186GB
JSIIA1129GB