2014 NISSAN TEANA Service Manual

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NISSAN TEANA 2014 Service Manual
HAC-8
< PREPARATION >[AUTOMATIC AIR CONDITIONER]
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000009463089
The actual shapes of the tools may
differ from those illustrated here

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NISSAN TEANA 2014 Service Manual
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Part LocationINFOID:0000000009463091
ALIIA0597

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NISSAN TEANA 2014 Service Manual
HAC-10
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
COMPONENT PARTS
Component Description
INFOID:0000000009463092
1. ECM 2. IPDM E/R 3. BCM (view with combination meter removed)
4. A/C auto amp

HAC-10
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
COMPONENT PARTS
Component Description
INFOID:0000000009463092
1. ECM 2. IPDM E/R 3. BCM (view with combination meter removed)
4. A/C auto amp. (view with A/C switch assembly removed) 5. A/C switch assembly 6. A/C Compressor
7. Sunload sensor 8. Refrigerant pressure sensor (view with front bumper fascia removed)9. Ambient sensor
10. Fuse Block (J/B), Front blower motor relay 11. In-vehicle sensor 12. Accessory relay-2 (view with instru-
ment panel removed)
13. Blower motor (view with front A/C as- sembly removed from vehicle) 14. Intake door motor 15. Mode door motor
16. Air mix door motor LH 17. Air mix door motor RH 18. Intake sensor
ALIIA0599ZZ
Component Description
A/C auto amp. A/C auto amp. controls front automatic air conditioning system by inputting and calculating signals
from each sensor and each switch.
A/C Compressor Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is compressed
to a high pressure, high temperature vapor. The hot, compressed vapor is then discharged to the con-
denser.
A/C switch assembly The A/C switch assembly controls the operation of the A/C and heating system based on inputs from
the temperature control knob, the mode switches, the blower control dial, the ambient temperature
sensor, the intake sensor, and inputs received from the ECM across the CAN. Diagnosis of the A/C
switch assembly can be performed using the CONSULT. There is no self-diagnostic feature available.
Air mix door motor LH The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
by the A/C auto amp. based on the position of the temperature dial. The air mix door motor LH re-
ceives position commands from the A/C auto amp. and reports actual door position back via an LCU
(Local Control Unit) installed inside the motor. Commands and responses are sent across the LIN (Lo-
cal Interconnect Network) to each motor simultaneously, with each motor having its own unique ad-
dress, thereby only responding to requests sent to its specific address. The LCU reads the door
position from a Position Balanced Resistor (PBR), also part of the motor, and returns that information
to the A/C auto amp. The LCU switches the polarity of the circuits connected to the DC motor to drive
the motor forward or backward as requested by the A/C auto amp. If the air mix door moves to a po-
sition less than 5% or more than 95% of its expected or allowed positions, the A/C auto amp. will set
a DTC.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

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Air mix door motor RH The air mix door controls the mix of hot or cold air that enters th

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Air mix door motor RH The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
by the A/C auto amp. based on the position of the temperature dial. The air mix door motor RH re-
ceives position commands from the A/C auto amp. and reports actual door position back via an LCU
(Local Control Unit) installed inside the motor. Commands and responses are sent across the LIN (Lo-
cal Interconnect Network) to each motor simultaneously, with each motor having its own unique ad-
dress, thereby only responding to requests sent to its specific address. The LCU reads the door
position from a Position Balanced Resistor (PBR), also part of the motor, and returns that information
to the A/C auto amp. The LCU switches the polarity of the circuits connected to the DC motor to drive
the motor forward or backward as requested by the A/C auto amp. If the air mix door moves to a po-
sition less than 5% or more than 95% of its expected or allowed positions, the A/C auto amp. will set
a DTC.
Ambient sensor The ambient sensor measures the temperature of the air surrounding the vehicle. The sensor uses a
thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
BCM The BCM receives the fan ON and A/C ON signals from the A/C auto amp. and sends a compressor
ON request to the ECM.
Blower motor The blower motor varies the speed at which the air flows through the ventilation system.
ECM The ECM sends a compressor ON request to the IPDM E/R based on the status of engine operation
and load as well as refrigerant pressure information. If all the conditions are met for A/C operation,
the ECM transmits the compressor ON request to the IPDM E/R. The ECM shares the refrigerant
pressure sensor signal, engine RPM, and engine coolant temperature with the A/C auto amp. via
CAN communication line.
Front blower motor relay The front blower motor relay controls the flow of current to fuse 17 and 27 in the Fuse Block (J/B).
The relay is connected directly to ground, and is energized when the ignition switch is in the ON or
START position.
Fuse Block (J/B) Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) contains the
front blower motor relay and several fuses required for the air conditioner control system.
Intake door motor The intake door motor controls the position of the intake door. Fresh air is allowed to enter the cabin
in one position, and recirculated inside air is allowed to enter in the other position. At times the A/C
auto amp. may command partial fresh or recirculation based on evaporator or coolant temperatures.
The intake door motor receives position commands from the A/C auto amp. and reports actual door
position back via an LCU (Local Control Unit) installed inside the motor. Commands and responses
are sent across the LIN (Local Interconnect Network) to each motor simultaneously, with each motor
having its own unique address, thereby only responding to requests sent to its specific address. The
LCU reads the door position from a Position Balanced Resistor (PBR), also part of the motor, and re-
turns that information to the A/C auto amp. The LCU switches the polarity of the circuits connected to
the DC motor to drive the motor forward or backward as requested by the A/C auto amp. If the recir-
culation door moves to a position less than 5% or more than 95% of its expected or allowed positions,
the A/C auto amp. will set a DTC.
Intake sensor The intake sensor measures the temperature of the front evaporator fins. The sensor uses a ther-
mistor which is sensitive to the change in temperature. The electrical resistance of the thermistor de-
creases as temperature increases.
In-vehicle sensor In-vehicle sensor measures temperature of intake air that flows through aspirator to passenger room.
The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resis-
tance of the thermistor decreases as temperature increases.
IPDM E/R Refer to PCS-6, "RELAY CONTROL SYSTEM : System Description"
.
Mode door motor The mode door controls the direction the conditioned air passes through the ventilation system.
Through a series of levers and gears, the mode door controls the defrost door, the foot door, and the
vent door. There are 5 preset positions: VENT, B/L, FOOT, D/F, and DEF. The FOOT position can be
set to allow some airflow through to the defroster vent, or to completely block the defroster vent using
the CONSULT. The mode door motor receives position commands from the A/C auto amp. and re-
ports actual door position back via an LCU (Local Control Unit) installed inside the motor. Commands
and responses are sent across the LIN (Local Interconnect Network) to each motor simultaneously,
with each motor having its own unique address, thereby only responding to requests sent to its spe-
cific address. The LCU reads the door position from a Position Balanced Resistor (PBR), also part of
the motor, and returns that information to the A/C auto amp. The LCU switches the polarity of the cir-
cuits connected to the DC motor to drive the motor forward or backward as requested by the A/C auto
amp. The mode door has 5 expected positions and, therefore, can set up to 5 DTCs if the expected
position is not reported back to the A/C auto amp.
Component Description
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 2661 of 4801

NISSAN TEANA 2014 Service Manual
HAC-12
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
COMPONENT PARTS
Refrigerant pressure sensorRefer to
EC-36, "Refrigerant Pressure Sensor" for QR25DE and EC-562, "Refrigerant Pressure Sen-
s

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NISSAN TEANA 2014 Service Manual
SYSTEMHAC-13
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System DiagramINFOID:0000000009463093
System DescriptionINFOID:0000000009463094
• Front au

Page 2663 of 4801

NISSAN TEANA 2014 Service Manual
HAC-14
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
SYSTEM
-
HAC-16, "Compressor Control"
-HAC-17, "Door Control"
-HAC-20, "Temperature Control"
- Correction for input value of each sensor
Ambie

HAC-14
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONER]
SYSTEM
-
HAC-16, "Compressor Control"
-HAC-17, "Door Control"
-HAC-20, "Temperature Control"
- Correction for input value of each sensor
Ambient sensor (setting temperature correction)• A/C auto amp. controls passenger r oom temperature so that the optimum level always matches the temper-
ature level that the passenger may feel. Correction is appl ied to the target temperature that is set using tem-
perature control dial, according to ambient temperature detected by ambient sensor.
In-vehicle sensor [in-vehicle temperature correction]• Passenger room temperature detected by in-vehicle s ensor is corrected for each front air conditioning con-
trol (driver side and passenger side).
Intake sensor (intake temperature correction)• A/C auto amp. performs correction to change recogniti on intake temperature of A/C auto amp. quickly when
difference is large between recognition intake temperat ure and intake temperature detected by intake tem-
perature sensor. The correction is performed to change recognition intake temperature slowly when differ-
ence is small.
Sunload sensor (sunload amount correction)
• Sunload amount detected by sunload sensor is corrected for each air conditioning control.
• A/C auto amp. performs correction to change recogni tion sunload amount of A/C auto amp. slowly when
sunload amount changes quickly, for example when entering or exiting a tunnel.
Control by ECM- Cooling fan control Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-575, "COOLING FAN CONTRO L : System Description" (VQ35DE).
- Air conditioning cut control
Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-573, "AIR CONDITIONING CUT CONTROL : System Description" (VQ35DE).
Control by IPDM E/R- Relay control
Refer to PCS-6, "RELAY CONTROL SYSTEM : System Description"
.
- Cooling fan control
Refer to EC-59, "COOLING FAN CONTROL : System De scription (with automatic air conditioner)"
(QR25DE) or EC-575, "COOLING FAN CONTRO L : System Description" (VQ35DE).
Control by BCM- Relay control
Refer to BCS-7, "BODY CONTROL SYST EM : System Description"
.
Air Flow ControlINFOID:0000000009463095
DESCRIPTION
• A/C auto amp. changes duty ratio of blower motor dr ive signal and controls air flow continuously. When air
flow is increased, duty ratio of blower motor contro l signal gradually increases to prevent a sudden increase
in air flow.
• In addition to manual control and automatic control, air fl ow control consists of starting fan speed control, low
coolant temperature starting control, high in-vehicl e temperature starting control and fan speed control at
door motor operation
AUTOMATIC AIR FLOW CONTROL
• A/C auto amp. decides target air flow depending on target air mix door opening angle.
• A/C auto amp. changes duty ratio of blower motor c ontrol signal and controls the air flow continuously so
that air flow matches the target air flow.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

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NISSAN TEANA 2014 Service Manual
SYSTEMHAC-15
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• When air outlet is VENT or B/L, the minimum air flow is changed depending on sunload.
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