Nissan Pathfinder (2011 year). Manual — part 463
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-167
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component Description
INFOID:0000000006243724
COMPONENT DESCRIPTION
Front Air Control
The front air control (1) has a built-in microcomputer which pro-
cesses information sent from various sensors needed for air condi-
tioner operation. The air mix door motor, mode door motor, intake
door motor, defroster door motor, blower motor and compressor are
then controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
Potentio Temperature Control (PTC)
The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature dial.
Front Air Control Component Function Check
INFOID:0000000006243725
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK
1. Turn blower control dial to position 1-4, then press A/C switch.
2. Confirm that the compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-167, "Front Air Control Power and Ground Diagnosis
.
Front Air Control Power and Ground Diagnosis Procedure
INFOID:0000000006243726
Regarding Wiring Diagram information, refer to
HAC-172, "Wiring Diagram - Manual"
.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
AWIIA1197ZZ
WJIA1311E
2011 Pathfinder
HAC-168
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
SYMPTOM: A/C system does not come on.
1.
CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Turn ignition switch ON.
4. Check voltage between front air control harness connector M52
terminals 6 and 19, and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to
.
• If fuses are OK, check harness for open circuit. Repair or replace as necessary.
• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
2.
CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Check continuity between front air control harness connector
M52 terminal 20 and ground.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
NO
>> Repair harness or connector.
WJIA1461E
Terminals
Ignition switch position
(+)
(-)
OFF
ACC
ON
Front air
control
connector
Terminal No.
M52
6
Ground
Approx. 0V
Approx. 0V
Battery
voltage
M52
19
Battery
voltage
Battery
voltage
Battery
voltage
AWIIA0863ZZ
20 - Ground
: Continuity should exist.
AWIIA0864ZZ
2011 Pathfinder
AIR CONDITIONER CONTROL
HAC-169
< ECU DIAGNOSIS INFORMATION >
[MANUAL AIR CONDITIONER]
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ECU DIAGNOSIS INFORMATION
AIR CONDITIONER CONTROL
System Description
INFOID:0000000006243727
The front air control provides regulation of the vehicle's interior temperature. The system is based on the posi-
tion of the front air controls temperature switch selected by the driver. This is done by utilizing a microcom-
puter, also referred to as the front air control, which receives input signals from the following two sensors:
• Intake sensor
• PBR (position balanced resistor)
The front air control uses these signals (including the set position of the temperature switch) to control:
• Outlet air volume
• Air temperature
• Air distribution
System Operation
INFOID:0000000006243728
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
control dial.
BLOWER SPEED CONTROL
Blower speed is controlled based on front blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned counterclockwise, and decreases air flow volume each time the blower switch is turned coun-
terclockwise.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode dial.
DEFROSTER DOOR CONTROL
The defroster door is controlled by the defroster dial set to defroster.
MAGNET CLUTCH CONTROL
When the A/C switch is pressed, or the mode dial is turned to the defroster 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.
WJIA1293E
2011 Pathfinder
HAC-170
< ECU DIAGNOSIS INFORMATION >
[MANUAL AIR CONDITIONER]
AIR CONDITIONER CONTROL
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.
Front Air Control Terminals Reference Values
INFOID:0000000006243729
Measure voltage between each terminal and ground by following
Terminals and Reference Values for front air control.
FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR FRONT AIR CONTROL
AWIIA1197ZZ
WJIA2011E
Terminal
No.
Wire
color
Item
Ignition
switch
Condition
Voltage (V)
(Approx.)
1
BR
Mode door motor CW
ON
Clockwise rotation
Battery voltage
2
W
Air mix door motor (Driver) CW
ON
Clockwise rotation
Battery voltage
3
GR
Air mix door motor (Driver) CCW
ON
Counterclockwise rotation
Battery voltage
4
Y
Intake door motor CW
ON
Clockwise rotation
Battery voltage
5
O
Intake door motor CCW
ON
Counterclockwise rotation
Battery voltage
6
W/G
Power supply for IGN
ON
-
Battery voltage
8
G
Illumination +
ON
Park lamps ON
Battery voltage
9
BR
Illumination -
-
Park lamps ON
10
W
Compressor ON signal
ON
A/C switch OFF
5V
ON
A/C switch ON
0V
11
Y
Rear defrost request
ON
-
Battery voltage
12
L
Intake sensor
ON
-
0 - 5V
13
V
Sensor ground
ON
-
0 - 5V
14
R
Mode door motor CCW
ON
Counterclockwise rotation
Battery voltage
PIIA2344E
2011 Pathfinder
AIR CONDITIONER CONTROL
HAC-171
< ECU DIAGNOSIS INFORMATION >
[MANUAL AIR CONDITIONER]
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18
BR
Front blower monitor
ON
Front blower motor OFF
Battery voltage
Front blower motor ON
0V
19
R/Y
Power supply for BAT
-
-
Battery voltage
20
B
Ground
-
-
0V
21
V
Mode door motor feedback
ON
-
0 - 5V
22
SB
Air mix door motor (Front) feedback
ON
-
0 - 5V
23
G
Power supply for mode door motor
and air mix door motor (Front) PBR
ON
-
5V
25
R
Rear defroster request
ON
-
Battery voltage
26
P
Ground for mode door motor and air
mix door motor (Front) PBR
ON
-
0V
Terminal
No.
Wire
color
Item
Ignition
switch
Condition
Voltage (V)
(Approx.)
2011 Pathfinder
HAC-172
< WIRING DIAGRAM >
[MANUAL AIR CONDITIONER]
AIR CONDITIONER CONTROL
WIRING DIAGRAM
AIR CONDITIONER CONTROL
Wiring Diagram - Manual
INFOID:0000000006543806
ABIWA0253GB
2011 Pathfinder
AIR CONDITIONER CONTROL
HAC-173
< WIRING DIAGRAM >
[MANUAL AIR CONDITIONER]
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HAC
N
O
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ABIIA0671GB
2011 Pathfinder
HAC-174
< WIRING DIAGRAM >
[MANUAL AIR CONDITIONER]
AIR CONDITIONER CONTROL
ABIIA0358GB
2011 Pathfinder
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