Nissan Pathfinder (2011 year). Instruction — part 445
DIAGNOSIS SYSTEM (BCM)
HAC-23
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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AIR CONDITIONER
AIR CONDITIONER : CONSULT-III Function (BCM - AIR CONDITIONER)
INFOID:0000000006710644
DATA MONITOR
Monitor Item [Unit]
Description
IGN ON SW [On/Off]
Indicates condition of ignition switch ON position.
FAN ON SIG [On/Off]
Indicates condition of fan switch.
AIR COND SW [On/Off]
Indicates condition of A/C switch.
2011 Pathfinder
HAC-24
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
SELF-DIAGNOSIS FUNCTION
A/C Auto Amp. Self-Diagnosis
INFOID:0000000006243629
A/C SYSTEM SELF-DIAGNOSIS FUNCTION
The self-diagnosis function is built into the A/C auto amp. to quickly locate the cause of malfunctions.
DESCRIPTION
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to
HAC-25, "A/C System Self-Diagnosis Code Chart"
SELF-DIAGNOSTIC MODE
NOTE:
Radio must be OFF.
1. Turn the ignition switch ON.
2. On the A/C and AV switch assembly, press the "SETTING" but-
ton and twist the volume knob clockwise and counterclockwise
until the Self-Diagnosis screen shows on the display.
3. Scroll down to "Confirmation/Adjustment" and press the
"ENTER" button.
4. Scroll down to "Climate Control" and press the "ENTER" button.
5. The fan bars will flash on the display during the self-test, and
then the fault codes will display in the ambient temperature area.
They will continue scrolling until diagnostic mode is exited.
6. Exit by pressing the "BACK" button on A/C and AV switch
assembly until display returns to its normal operation screen.
HVAC system will be OFF or by turning the ignition switch OFF.
The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to
applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-
ature display area. Refer to
HAC-25, "A/C System Self-Diagnosis Code Chart"
A/C and AV Switch Assembly Self-Diagnosis
INFOID:0000000006243630
A/C and AV switch assembly self-diagnosis function
The ON/OFF operation (continuity) of each switch in the A/C and AV switch assembly can be checked.
Self-diagnosis mode
AWNIA0098ZZ
AWIIA0081ZZ
2011 Pathfinder
SELF-DIAGNOSIS FUNCTION
HAC-25
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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• Press the “BACK” switch and the “UP” switch within 10 seconds
after turning the ignition switch from OFF to ACC and hold them for
3 seconds or more. Then the buzzer sounds, all indicators of the
preset switch illuminate, and the self-diagnosis mode starts.
• The continuity of each switch and control dials (A/C and AV switch
assembly only) at the ON position can be checked by pressing
each switch and turning each control dial. The buzzer sounds and
LED's will illuminate if the switch is normal.
Finishing self-diagnosis mode
Self-diagnosis mode is canceled when turning the ignition switch OFF.
A/C System Self-Diagnosis Code Chart
INFOID:0000000006243631
SELF-DIAGNOSTIC CODE CHART
AWIIA0171GB
Code No.
Reference page
02
EE changed by calibration
VTL-7, "Removal and Installation"
03
Battery voltage out of range
12
Passenger air mix door open/short/out of limits
HAC-34, "Air Mix Door Motor (Passenger) Diagnosis Proce-
dure"
22
Driver air mix door open/short
HAC-32, "Air Mix Door Motor (Driver) Diagnosis Procedure"
30
In-vehicle sensor circuit out of range (low)
HAC-82, "In-Vehicle Sensor Diagnosis Procedure"
31
In-vehicle sensor circuit out of range (high)
38
Air mix door motor (rear) circuit failure
HAC-57, "Rear Air Control Component Function Check"
40
Ambient sensor circuit short
HAC-79, "Ambient Sensor Diagnosis Procedure"
41
Ambient sensor circuit open
44
Intake door motor open
HAC-39, "Intake Door Motor Diagnosis Procedure"
46
Intake door motor short
50
Optical sensor (Driver) circuit open or short
HAC-85, "Optical Sensor Diagnosis Procedure"
52
Optical sensor (Passenger) circuit open or short
56
Intake sensor circuit short
HAC-164, "Intake Sensor Diagnosis Procedure"
57
Intake sensor circuit open
80
CAN bus fault
LAN-14, "Trouble Diagnosis Flow Chart"
81
BCM message missing
82
Intake door motor circuit malfunction
HAC-39, "Intake Door Motor Diagnosis Procedure"
90
Stuck button
VTL-7, "Removal and Installation"
92
Mode door motor circuit malfunction
HAC-27, "Mode Door Motor (Front) Component Function
Check"
2011 Pathfinder
HAC-26
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
DTC/CIRCUIT DIAGNOSIS
MODE DOOR MOTOR
System Description
INFOID:0000000006243632
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Mode door motor (front)
• PBR (built into mode door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/C auto amp. by means of the mode
door motor (front). When a mode door position is selected on the A/C auto amp., voltage is applied to one cir-
cuit of the mode door motor (front) while ground is applied to the other circuit, causing the mode door motor
(front) 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 A/C auto amp. monitors the mode door position by measuring the voltage signal
on the PBR circuit.
In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position
based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature
selected by the driver or passenger.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor (Front)
AWIIA0092GB
AWIIA0093GB
2011 Pathfinder
MODE DOOR MOTOR
HAC-27
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the A/C auto amp. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front) Component Function Check
INFOID:0000000006243633
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Press mode switch four times and then press the
(DEF) switch. Each position indicator should change
shape (on display).
2. Confirm that discharge air comes out according to the air distribution table. Refer to
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when FOOT (
), DEF (
) or D/F (
) is selected.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-27, "Mode Door Motor (Front) Diagnosis Procedure"
.
Mode Door Motor (Front) Diagnosis Procedure
INFOID:0000000006243634
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.
CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT-III, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
.
3. Observe "MODE FDBCK" voltage while cycling A/C auto amp. mode switch through all modes.
Is the inspection result normal?
YES
>> • Mode door motor is OK.
• Inspect mode door for mechanical failure. Refer to
VTL-27, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector M49 and the mode door motor harness connector
M142.
3. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 and the mode door
motor harness connector M142 terminals 5, 6.
WJIA1084E
Monitor Item
Condition
Results
MODE FDBCK
Cycle mode switch through all modes, D/F
(
), VENT (
), B/L (
), and FOOT(
)
Voltage varies between D/F (
) and VENT (
), and
between VENT (
) and B/L (
).
2011 Pathfinder
HAC-28
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
4. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR MODE DOOR MOTOR POWER AND GROUND
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Press the mode switch to the D/F (
) mode.
4. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing
the mode switch to the VENT (
), and then the B/L (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp.. Refer to
VTL-7, "Removal and Installation"
4.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connectors.
3. Check continuity between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28 and the
mode door motor harness connector M142 terminals 2, 3.
4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between A/C auto amp. harness connector M49 terminal 7 and mode door motor har-
ness connector M142 terminal 4.
Connector
Terminal
Connector
Terminal
Continuity
M49
19
M142
6
Yes
20
1
Connector
Terminal
—
Continuity
M49
19
Ground
No
20
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
Connector
Terminal
Connector
Terminal
Continuity
M49
3
M142
2
Yes
M50 28
3
Connector
Terminal
—
Continuity
M49
3
Ground
No
M50
28
2011 Pathfinder
MODE DOOR MOTOR
HAC-29
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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2. Check continuity between A/C auto amp. harness connector M49 terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
6.
CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL
1. Reconnect A/C auto amp. harness connectors.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.
4. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace A/C auto amp.. Refer to
VTL-7, "Removal and Installation"
7.
CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL
1. Reconnect the mode door motor harness connector M142.
2. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If mode door moves freely, replace A/C auto
amp.. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Replace the mode door motor. Refer to
VTL-27, "Removal and Installation"
.
Connector
Terminal
Connector
Terminal
Continuity
M49
7
M142
4
Yes
Connector
Terminal
—
Continuity
M49
7
Ground
No
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5V
Connector
Terminal
—
Voltage (Approx.)
M49
7
Ground
0V
Connector
Terminal
—
Voltage (Approx.)
M49
7
Ground
0.2 to 4.8V
2011 Pathfinder
HAC-30
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
System Description
INFOID:0000000006243635
SYSTEM DESCRIPTION
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Air mix door motors (driver, passenger, and rear)
• PBR (built-into air mix door motors)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The A/C auto amp. receives data from the temperature selected by the driver side, passenger side, and rear.
The A/C auto amp. then applies a voltage to one circuit of the appropriate air mix door motor, while ground is
applied to the other circuit, causing the appropriate air mix 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 A/C auto
amp. monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the A/C auto amp. which
determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,
intake sensor, and the temperature selected by the driver and front and rear passengers.
Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
door position data is returned to the A/C auto amp.
AWIIA0106GB
2011 Pathfinder
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