Nissan Versa Note. Instruction — part 494
COMPONENT PARTS
HAC-11
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
C
D
E
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L
M
A
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HAC
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009549322
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-27, "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.
Blower relay
The blower 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]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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P
SYSTEM
System Description
INFOID:0000000009549323
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
• The instruction 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:0000000009549324
PRINCIPLE OF OPERATION
Compressor is not activated.
Functional Circuit Diagram
ALIIA0813GB
Module/Function
Door control
A/C request signal
Compressor control
Cooling fan control
Front air control
—
—
BCM
—
(With Intelligent Key)
(Without Intelligent Key)
—
—
ECM
—
—
IPDM E/R
—
—
HAC-14
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
Functional Initial Inspection Chart
×: Applicable
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-6, "RELAY CONTROL SYSTEM : System Description"
(with Intelligent
Key) or
PCS-35, "RELAY CONTROL SYSTEM : System Description"
(without Intelligent Key)
L (1)
: Fan ON signal
CAN (1)
: A/C ON signal
L (2)
: A/C switch signal
: Blower fan ON signal
L (3)
: Defroster position switch 2
CAN (2)
: A/C compressor request signal
L (4)
: Thermo control amp. ON signal
: A/C compressor feedback signal
JPIIA1661GB
Control unit
Diagnosis item
Location
A
B
C
D
E
BCM
“BCM-AIR COND”
Self-diagnosis
—
×
—
—
—
Data monitor
×
—
—
—
—
ECM
“ENGINE”
Self-diagnosis
(CAN communication line)
—
—
—
×
—
Data monitor
—
×
×
—
—
IPDM E/R
“IPDM E/R”
Self-diagnosis
(CAN communication line)
—
—
—
—
×
Data monitor
—
—
—
×
—
Auto active test
—
—
—
—
×
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