Nissan Pathfinder (2008 year). Manual — part 435
HAC-24
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
SELF-DIAGNOSIS FUNCTION
• 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:0000000001366700
SELF-DIAGNOSTIC CODE CHART
AWIIA0171GB
Code No.
Reference page
02
EE changed by calibration
VTL-8, "Removal and Installation"
03
Battery voltage out of range
CHG-10, "Inspection Procedure"
12
Passenger air mix door open/short/out of limits
HAC-37, "Air Mix Door Motor (Passenger) Diagnosis Proce-
dure"
22
Driver air mix door open/short
HAC-33, "Air Mix Door Motor (Driver) Diagnosis Procedure"
30
In-vehicle sensor circuit out of range (low)
HAC-80, "In-Vehicle Sensor Diagnosis Procedure"
31
In-vehicle sensor circuit out of range (high)
38
Air mix door motor (rear) circuit failure
HAC-61, "Rear Air Control Component Function Check"
40
Ambient sensor circuit short
HAC-77, "Ambient Sensor Diagnosis Procedure"
41
Ambient sensor circuit open
44
Intake door motor open
HAC-43, "Intake Door Motor Diagnosis Procedure"
46
Intake door motor short
50
Optical sensor (Driver) circuit open or short
HAC-83, "Optical Sensor Diagnosis Procedure"
52
Optical sensor (Passenger) circuit open or short
56
Intake sensor circuit short
HAC-157, "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-43, "Intake Door Motor Diagnosis Procedure"
90
Stuck button
VTL-8, "Removal and Installation"
92
Mode door motor circuit malfunction
MODE DOOR MOTOR
HAC-25
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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COMPONENT DIAGNOSIS
MODE DOOR MOTOR
System Description
INFOID:0000000001366701
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
HAC-26
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
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:0000000001366702
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.
Can a symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to
.
Can a symptom be duplicated?
YES
>> Refer to
HAC-122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
CHECK MODE DOOR OPERATION
Check and verify mode door mechanism for smooth operation in each mode.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair as necessary.
5.
PERFORM A/C AUTO AMP. SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
Are any self-diagnosis codes present?
YES
>> Refer to
HAC-24, "A/C System Self-Diagnosis Code Chart"
.
NO
>> GO TO 6.
6.
PERFORM A/C AND AV SWITCH ASSEMBLY SELF-DIAGNOSIS
Perform self-diagnosis to check the A/C and AV switch assembly. Refer to
.
Is the inspection result normal?
YES
>> Replace A/C and AV switch assembly. Refer to
VTL-8, "Removal and Installation"
NO
>> GO TO 6.
WJIA1084E
MODE DOOR MOTOR
HAC-27
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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7.
CHECK THE MODE DOOR MOTOR (FRONT) PBR CIRCUIT
Perform diagnostic procedure for the mode door motor (front). Refer to
HAC-135, "Mode Door Motor (Front)
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair PBR circuit or replace motor. Refer to
HAC-136, "Mode Door Motor (Front) Diagnosis Pro-
8.
RECHECK FOR CODES
Perform A/C auto amp. self-diagnosis. Refer to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
.
Are any self-diagnostic codes present?
YES
>> Refer to
HAC-24, "A/C System Self-Diagnosis Code Chart"
.
NO
>> GO TO 9.
9.
RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to
.
Does another symptom exist?
YES
>> Repair as necessary.
NO
>> Replace A/C auto amp. Refer to
VTL-8, "Removal and Installation"
.
Mode Door Motor (Front) Diagnosis Procedure
INFOID:0000000001366703
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1.
Turn ignition switch ON.
2.
Press the mode switch to the B/L (
) mode.
3.
Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the floor (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
2.
CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
1.
Turn ignition switch OFF.
2.
Disconnect the A/C auto amp. harness connector.
3.
Check continuity between A/C auto amp. harness connector
M49 terminal 19, 20 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
20
19
Press
mode
switch
Battery
voltage
AWIIA0095ZZ
19 - Ground
: Continuity should not exist.
20 - Ground
: Continuity should not exist.
AWIIA0096ZZ
HAC-28
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
3.
CHECK A/C AUTO AMP. FOR GROUND AND POWER
1.
Press the mode switch to the D/F (
) mode.
2.
Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the vent (
) mode.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace A/C auto amp. Refer to
VTL-8, "Removal and Installation"
4.
CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect the A/C auto amp. harness connector.
3.
Check continuity between A/C auto amp. harness connector
M49 terminal 19 and terminal 20.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
5.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1.
Disconnect the mode door motor harness connector.
2.
Check continuity between A/C auto amp. harness connector
M49 (A) terminal 19, 20 and the mode door motor harness con-
nector M142 (B) terminal 1, 6.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
6.
CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND
1.
Reconnect A/C auto amp. harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between A/C auto amp. harness connector M50
(A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
7.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
19 20
Press
mode
switch
Battery
voltage
AWIIA0097ZZ
Continuity should exist.
AWIIA0098ZZ
6 - 19
: Continuity should exist.
1 - 20
: Continuity should exist.
AWIIA0225ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M49, M50
28
3
5V
AWIIA0099ZZ
MODE DOOR MOTOR
HAC-29
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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1.
Turn ignition switch OFF.
2.
Disconnect the A/C auto amp. harness connector.
3.
Check continuity between A/C auto amp. harness connector
M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
8.
CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1.
Turn ignition switch OFF.
2.
Disconnect the A/C auto amp. harness connector.
3.
Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10
9.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1.
Disconnect the mode door motor harness connector.
2.
Check continuity between mode door motor harness connector
M142 (B) terminal 3, 1 and A/C auto amp. harness connector
M49 (C) terminal 3, M50 (A) terminal 28.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
10.
CHECK PBR FEEDBACK VOLTAGE
1.
Reconnect the A/C auto amp. harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between A/C auto amp. harness connector M49
terminal 7 and ground while cycling mode switch through all
modes.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 12.
11.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
Continuity should not exist.
AWIIA0100ZZ
Continuity should exist.
AWIIA0101ZZ
28 - 3
: Continuity should exist.
3 - 2
: Continuity should exist.
AWIIA0226ZZ
Voltage
: Approx. 1V - 4.5V
AWIIA0103ZZ
HAC-30
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. harness connector.
3.
Check continuity between A/C auto amp. harness connector
M49 terminal 7 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
12.
CHECK PBR FEEDBACK CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect the mode door motor harness connector and A/C
auto amp. harness connector.
3.
Check continuity between mode door motor harness connector
M142 terminal 4 and A/C auto amp. harness connector M49 ter-
minal 7.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
Continuity should not exist.
AWIIA0104ZZ
Continuity should exist.
AWIIA0227ZZ
AIR MIX DOOR MOTOR
HAC-31
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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AIR MIX DOOR MOTOR
System Description
INFOID:0000000001366704
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
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