2014 NISSAN TEANA Service Manual

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NISSAN TEANA 2014 Service Manual
HAC-112
< PRECAUTION >[MANUAL AIR CONDITIONER]
PRECAUTIONS
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut-
o

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PREPARATIONHAC-113
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PREPARATION
PREPARATION
Special Service ToolINFOID:0000000009463190
The actual shapes of the tools may

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HAC-114
< SYSTEM DESCRIPTION >[MANUAL AIR CONDITIONER]
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Part LocationINFOID:0000000009463192
1. ECM 2. IPDM E/R 3. BCM (view with combinati

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COMPONENT PARTSHAC-115
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Component DescriptionINFOID:0000000009463193
7. Refrigerant pressure sensor (view with fron

COMPONENT PARTSHAC-115
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Component DescriptionINFOID:0000000009463193
7. Refrigerant pressure sensor (view with front bumper fascia removed) 8. Blower motor (view with front air con-
ditioning assembly removed from ve-
hicle) 9. Intake door motor
10. Mode door motor 11. Air mix door motor
Component Description
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.
Air mix door motor The air mix door controls the mix of hot or cold air that enters the ventilation system. It is controlled
by the front air control based on the position of the temperature dial. The air mix door motor receives
position commands from the front air control 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 In-
terconnect 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 returns that information to the front
air control. The LCU switches the polarity of the circuits connected to the DC motor to drive the motor
forward or backward as requested by the front air control.
BCM The BCM receives the fan ON and A/C ON signals from the front air control 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 front air control via
CAN communication line.
Front air control The front air control 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, and inputs received from the
ECM and combination meter across the CAN.
Front blower motor relay The front blower motor relay controls the flow of current to fuses 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 front
air control may command partial fresh or recirculation based on evaporator or coolant temperatures.
The intake door motor receives position commands from the front air control 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 front air control. The LCU switches the polarity of the circuits connected
to the DC motor to drive the motor forward or backward as requested by the front air control.
IPDM E/R Refer to PCS-6, "RELAY CONTROL SYSTEM : System Description"
.
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HAC-116
< SYSTEM DESCRIPTION >[MANUAL AIR CONDITIONER]
COMPONENT PARTS
Mode door motorThe mode door controls the direction the conditioned air passes through the ventilation system.
Through a serie

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SYSTEM
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System DiagramINFOID:0000000009463194
System DescriptionINFOID:0000000009463195
• The manua

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HAC-118
< SYSTEM DESCRIPTION >[MANUAL AIR CONDITIONER]
SYSTEM
Control by ECM- Cooling fan control
Refer to EC-60, "COOLING FAN CONTROL : System Description (with manual air conditioner)"
(QR25DE)

HAC-118
< SYSTEM DESCRIPTION >[MANUAL AIR CONDITIONER]
SYSTEM
Control by ECM- Cooling fan control
Refer to EC-60, "COOLING FAN CONTROL : System Description (with manual air conditioner)"
(QR25DE)
or EC-575, "COOLING FAN CONTROL : System Description"
(VQ35DE).
- Air conditioning cut control Refer to EC-57, "AIR CONDITIONING CUT CONTROL : Sy stem Description (with manual 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-60, "COOLING FAN CONTROL : System Description (with manual air conditioner)"
(QR25DE)
or EC-575, "COOLING FAN CONTROL : System Description"
(VQ35DE).
Air Flow ControlINFOID:0000000009463196
DESCRIPTION
• Front air control changes duty ratio of front blower mo tor control signal to control air flow continuously. When
air flow is increased, duty ratio of front blower mo tor control signal gradually increases to prevent a sudden
increase in air flow.
• In addition to manual control, air flow control is composed of fan speed control at door motor operation.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, front air control temporarily
reduces fan speed so that mode door moves smoothly.
Air Inlet ControlINFOID:0000000009463197
The intake door position is automatically controlled in MAX A/C and DEF modes. The intake door is controlled
by customer input in the other modes.
Air Outlet ControlINFOID:0000000009463198
Air outlet control is controlled by customer input. When t he A/C is turned off by turning the blower control dial
fully counterclockwise, the front air control retains the current selections and returns to these selections the
next time the blower control dial is turned to any fan position.
NOTE:
If ambient temperature is excessively low, D/F is se lected to prevent windshield fogging when air outlet is set
to FOOT.
Compressor ControlINFOID:0000000009463199
DESCRIPTION
In order for the IPDM E/R to complete a compress or ON request, the following conditions must be met:
1. The BCM detects a Fan ON signal from the front air control. The front air control grounds the fan ON sig-
nal monitored by the BCM when the blower speed dial is in any of the fan speed positions.
2. The BCM detects an A/C ON signal from the front air control. The front air control grounds the A/C ON sig-
nal monitored by the BCM when:
- The A/C switch is pressed. The A/C switch LED ill uminates and the front air control grounds the A/C ON
signal monitored by the BCM. Any mode c ontrol button except D/F may be selected.
- The A/C switch is OFF, and the MAX A/C button is pr essed. The A/C switch LED will automatically illumi-
nate and the front air control grounds the A/C ON signal monitored by the BCM.
- The A/C switch is OFF, and the mode button for either D/F or DEF is selected. The front air control
grounds the A/C ON signal monitored by the BCM, but it does not illuminate the A/C switch LED
NOTE:
If the compressor was engaged by pressing the D/F or DE F mode buttons, and the time spent in either mode
exceeds 1 minute, then the compressor stays reques ted, even when modes other than D/F or DEF are
selected, until either:
1. The ignition switch is turned OFF.
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SYSTEM
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2. The blower speed dial is turned completely counterclockwise to the OFF position.
3. The A/C swit

SYSTEM
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2. The blower speed dial is turned completely counterclockwise to the OFF position.
3. The A/C switch is manually turned OFF.
In other words, the compressor ON request cannot be turned off in D/F or DEF modes.
REFRIGERANT PRESSURE PROTECTION
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank on the condenser. The refr igerant pressure sensor detects the pressure inside
the refrigerant line and sends a voltage signal to the EC M. If the system pressure rises above or falls below
the following values, the ECM requests the IPDM E/ R to de-energize the A/C relay and disengage the com-
pressor.
• 3.12 MPa (31.82 kg/cm
2, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2, 20.3 psi) or less
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system incr eases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm
2, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
COMPRESSOR OIL CIRCULATION CONTROL
When the engine starts while the engine coolant temperature is 56 °C (133 °F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor lubricant once.
OPERATING RATE CONTROL
When the set temperature is other than fully cold or the air outlet is “VENT”, “B/L” or “FOOT”, the front air con-
trol controls the compressor activation depending on ambient temperature.
Door ControlINFOID:0000000009463200
DOOR MOTOR CONTROL
• A Local Control Unit (LCU) is built into each door motor and detects the door position by using a Position
Balanced Resistor (PBR).
• Each door motor LCU has a unique address. The front air control communicates with the door motor LCUs by using each door’s unique communication address. The front air control sends requested door position
commands to each door motor LCU via a Local Interconnect Network (LIN) communication line. Each door
motor’s LCU receives the command and sends back a door position feedback signal.
• Each LCU controls each door to the appropriate posit ion depending on the control signal from the front air
control. When the door movement is complete, the LCU transmits a signal to the front air control indicating
that the door movement is complete.
SWITCHES AND THEIR CONTROL FUNCTION
ALIIA0607GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

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