Nissan Pathfinder (2008 year). Manual — part 448
HAC-128
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
REFRIGERATION SYSTEM
REFRIGERATION SYSTEM
Refrigerant Cycle
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Refrigerant System Protection
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HAC-128, "Refrigerant System Protection"
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MANUAL AIR CONDITIONER SYSTEM
HAC-129
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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MANUAL AIR CONDITIONER SYSTEM
Control System Diagram
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CONTROL SYSTEM
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
Control System Description
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CONTROL OPERATION
Front air control
AWIIA0592GB
WJIA1510E
HAC-130
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MANUAL AIR CONDITIONER SYSTEM
TEMPERATURE CONTROL DIAL (TEMPERATURE CONTROL)
Increases or decreases the set temperature.
RECIRCULATION (
) SWITCH
• When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.
• When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati-
cally turned OFF. REC mode can be re-entered by pressing REC switch again.
• REC switch is not operated when DEF switch is turned ON, or at the D/F or FOOT position.
DEFROSTER (
) SWITCH
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
REAR WINDOW DEFOGGER SWITCH
When switch is ON, rear window is defogged.
OFF SWITCH (BLOWER SPEED SET TO 0)
The compressor and blower are OFF.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch will turn off the A/C switch and compressor.)
MODE DIAL
Controls the air discharge outlets.
FRONT BLOWER CONTROL DIAL
Manually controls the four blower speeds.
MAGNET CLUTCH CONTROL
When the A/C switch is pressed, or the mode dial is turned to the DEF or D/F position, the front air control out-
puts a compressor ON signal to BCM.
The BCM then sends a compressor ON signal to ECM, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-
sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-
nal to IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
1.
Temperature control dial
2.
Blower control dial
3.
A/C switch
4.
Rear window defogger switch
5.
Recirculation switch
6.
Mode dial
WJIA1293E
MANUAL AIR CONDITIONER SYSTEM
HAC-131
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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Discharge Air Flow
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Switches And Their Control Function
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SWITCHES AND THEIR CONTROL FUNCTION
Mode door position
Air outlet/distribution
Vent
Foot
Defroster
95%
5%
—
60%
40%
—
20%
55%
25%
15%
50%
35%
7%
15%
78%
Airflow always present at driver and passenger side demisters
WJIA1296E
AWIIA0271GB
HAC-132
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MANUAL AIR CONDITIONER SYSTEM
WJIA1497E
CAN COMMUNICATION SYSTEM
HAC-133
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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CAN COMMUNICATION SYSTEM
System Description
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HAC-134
< FUNCTION DIAGNOSIS >
[MANUAL AIR CONDITIONER]
DIAGNOSIS SYSTEM (BCM)
DIAGNOSIS SYSTEM (BCM)
CONSULT-III Function (BCM)
INFOID:0000000001366839
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
DATA MONITOR
Display Item List
BCM diagnostic
test item
Diagnostic mode
Description
Inspection by part
WORK SUPPORT
Supports inspections and adjustments. Commands are transmitted to the BCM for
setting the status suitable for required operation, input/output signals are received
from the BCM and received data is displayed.
DATA MONITOR
Displays BCM input/output data in real time.
ACTIVE TEST
Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS
Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR
The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER
BCM part number can be read.
CONFIGURATION
Performs BCM configuration read/write functions.
Monitor item name “operation or
unit”
Contents
IGN ON SW
“ON/OFF”
Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.
COMP ON SIG
“ON/OFF”
Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
FAN ON SIG
“ON/OFF”
Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.
MODE DOOR MOTOR
HAC-135
< COMPONENT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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COMPONENT DIAGNOSIS
MODE DOOR MOTOR
System Description
INFOID:0000000001366782
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor
• PBR (built into mode door motor)
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode door motor to rotate. The
direction of rotation is determined by which circuit has voltage applied to it, and which one has ground applied
to it. The front air control monitors the mode door position by measuring the voltage signal on the PBR circuit.
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater and cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the front air control. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front) Component Function Check
INFOID:0000000001366783
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
WJIA1314E
WJIA1484E
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