Nissan Note E12. Manual — part 372
COMPONENT PARTS
HAC-11
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009477926
A.
RH front of engine compartment
B.
Behind LH side of front fascia
No.
Component
Description
1.
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.
2.
IPDM E/R
A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when receiving A/C com-
pressor request signal from ECM via CAN communication line.
3.
A/C compressor
Vaporized refrigerant is drawn into the A/C compressor from the evaporator, where it is com-
pressed to a high pressure, high temperature vapor. The hot, compressed vapor is then dis-
charged to the condenser.
4.
Refrigerant pressure sensor
EC-22, "Refrigerant Pressure Sensor"
.
ALIIA0811ZZ
HAC-12
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
COMPONENT PARTS
A.
LH side of instrument panel
B.
Behind center of instrument panel
C.
Center of instrument panel
No.
Component
Description
1.
BCM
The BCM receives the fan ON and A/C ON signals from the front air control and sends a com-
pressor ON request to the ECM.
2.
Fuse Block (J/B)
Located in the passenger compartment, behind the left lower IP, the Fuse Block (J/B) con-
tains the front blower motor relay and several fuses required for the air conditioner control
system.
3.
Front blower motor relay
The front blower motor relay controls the flow of current to fuse 20, 21 and 22 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.
4.
Front blower motor
The front blower motor varies the speed at which the air flows through the ventilation system.
5.
Front blower motor resistor
Ground for the blower is supplied through blower resistor and the blower speed switch. As
the switch is moved from position 1 through 4, more current is allowed to flow through the
motor, for a higher speed. This is because less resistors are in the path as the switch is
moved to a higher position. When the switch is on the highest position, all resistors are by-
passed.
6.
Thermo control amp.
Thermo control amp. is composed of thermistor and amplifier. When the A/C switch signal is
received from the front air control, the thermo control amp. transmits the A/C ON signal to the
BCM according to evaporator fin temperature. When the thermistor detecting temperature of
the air that passes through evaporator is extremely low, the thermo control amp. sends the
A/C OFF signal to BCM, and stops the compressor.
7.
Front air control
The front air control controls the operation of the A/C and heating system.
ALIIA0812ZZ
SYSTEM
HAC-13
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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SYSTEM
System Description
INFOID:0000000009477929
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
• The manual air conditioning system is controlled by a sequence of functions from the front air control, BCM,
ECM, and IPDM E/R.
• The fan speed of the front blower motor is changed by the combination of the fan control dial (fan switch)
operation and blower resistor control.
Compressor Control
INFOID:0000000009477930
DESCRIPTION
• When A/C switch signal is received from front air control, the thermo control amp. transmits A/C ON signal to
the BCM according to evaporator fin temperature.
• When the front blower motor is operated, the front air control transmits blower fan ON signal to the BCM.
• BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to
LAN-24, "CAN COMMUNICATION SYSTEM : System Description"
• ECM judges the conditions of each sensor (Refrigerant pressure sensor signal, accelerator position signal,
etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.
• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-
vates the compressor. Refer to
PCS-5, "RELAY CONTROL SYSTEM : System Description"
CONTROL BY THERMO CONTROL AMP.
ALIIA0477GB
Module/Function
Door control
A/C request signal
Compressor control
Cooling fan control
Front air control
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BCM
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ECM
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IPDM E/R
—
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HAC-14
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
Low Temperature Protection Control
• When thermo control amp. detects that evaporator fin temperature
is 1.5
°C (35°F) or less, thermo control amp. switches A/C ON sig-
nal to OFF and stops the compressor.
When the evaporator fin temperature returns to 3
°C (37°F) or
more, the compressor is activated.
CONTROL BY ECM
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 refrigerant pressure sensor detects the pressure inside
the refrigerant line and sends a voltage signal to the ECM. 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
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 oil once.
Air Conditioning Cut Control
When the engine is under a high load condition, the ECM transmits an A/C relay OFF request to IPDM E/R,
and stops the compressor. Refer to
EC-33, "AIR CONDITIONING CUT CONTROL : System Description"
Door Control
INFOID:0000000009477931
SWITCHES AND THEIR CONTROL FUNCTIONS
JMIIA1228GB
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