Nissan Pathfinder (2010 year). Instruction — part 445
HAC-36
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX 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 6 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 air mix door motor (driver) harness connector
and A/C auto amp. harness connector.
3. Check continuity between air mix door motor (driver) harness
connector M147 (B) terminal 2 and A/C auto amp. harness con-
nector M49 (A) terminal 6.
Is the inspection result normal?
YES
>> Replace air mix door motor (driver). Refer to
.
NO
>> Repair or replace harness as necessary.
Air Mix Door Motor (Passenger) Component Function Check
INFOID:0000000005476024
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial (driver) clockwise until 32
°
C (90
°
F) is displayed.
2. Check for hot air at discharge air outlets.
>> GO TO 2.
2.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial (driver) counterclockwise until 18
°
C (60
°
F) is displayed.
2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-41, "Intake Door Motor Diagnosis Procedure"
Air Mix Door Motor (Passenger) Diagnosis Procedure
INFOID:0000000005256923
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)
1.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
Continuity should not exist.
AWIIA0123ZZ
Continuity should exist.
AWIIA0230ZZ
2010 Pathfinder
AIR MIX DOOR MOTOR
HAC-37
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch ON.
2. Rotate temperature control dial (passenger) to 32
°
C (90
°
F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 14 and terminal 2 while rotating temperature control dial
(passenger) to 18
°
C (60
°
F).
Is the inspection result normal?
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (PASSENGER) 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 14, 2 and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Rotate temperature control dial (passenger) to 18
°
C (60
°
F).
3. Check voltage between A/C auto amp. harness connector M49
terminal 14 and terminal 2 while rotating temperature control dial
(passenger) to 32
°
C (90
°
F).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
4.
CHECK AIR MIX DOOR MOTOR (PASSENGER) 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
M50 terminal 14 and terminal 2.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
2 14
Rotate temp
control dial
Battery
voltage
AWIIA0125ZZ
14 - Ground
: Continuity should not exist.
2 - Ground
: Continuity should not exist.
AWIIA0126ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
14 2
Rotate temp
control dial
Battery
voltage
AWIIA0127ZZ
Continuity should exist.
AWIIA0128ZZ
2010 Pathfinder
HAC-38
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
1. Disconnect the air mix door motor (passenger) harness connec-
tor.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 14, 2 and the air mix door motor (passenger)
harness connector M143 (B) terminal 5, 6.
Is the inspection result normal?
YES
>> Replace air mix door motor (passenger). Refer to
30, "Removal and Installation"
.
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 8.
NO
>> GO TO 7.
7.
CHECK PBR REFERENCE VOLTAGE CIRCUIT 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 29 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 10.
NO
>> GO TO 9.
9.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
14 - 6
: Continuity should exist.
2 - 5
: Continuity should exist.
AWIIA0231ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M49
28
3
5V
AWIIA0099ZZ
Continuity should not exist.
AWIIA0241ZZ
Continuity should exist.
AWIIA0101ZZ
2010 Pathfinder
AIR MIX DOOR MOTOR
HAC-39
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Disconnect the air mix door motor (passenger) harness connec-
tor.
2. Check continuity between air mix door motor (passenger) har-
ness connector M143 (B) terminal 3, 1 and A/C auto amp. har-
ness connector M49 (C) terminal 3 and M50 (A) terminal 28.
Is the inspection result normal?
YES
>> Replace air mix door motor (passenger). Refer to
30, "Removal and Installation"
.
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 M50
terminal 29 and ground while rotating temperature control dial
(passenger) from 32
°
C (90
°
F) to 18
°
C (60
°
F).
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 29 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 air mix door motor (passenger) harness connec-
tor and A/C auto amp. harness connector.
3. Check continuity between air mix door motor (passenger) har-
ness connector M143 (B) terminal 2 and A/C auto amp. harness
connector M50 (A) terminal 29.
Is the inspection result normal?
YES
>> Replace air mix door motor (passenger). Refer to
30, "Removal and Installation"
.
NO
>> Repair or replace harness as necessary.
28 - 1
: Continuity should exist.
3 - 3
: Continuity should exist.
AWIIA0368ZZ
Voltage
: Approx. .5V - 4.5V
AWIIA0131ZZ
Continuity should not exist.
AWIIA0132ZZ
Continuity should exist.
AWIIA0233ZZ
2010 Pathfinder
HAC-40
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
System Description
INFOID:0000000005256924
SYSTEM DESCRIPTION
SYMPTOM:
• Intake door motor does not operate normally.
• Intake door does not change.
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Intake door motor (PRB built into the intake door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
In the AUTO mode, the A/C auto amp. determines the intake door position based on the ambient temperature,
the intake air temperature and the in-vehicle temperature. When the DEF, D/F, FLOOR or OFF switches are
pushed, the A/C auto amp. sets the intake door at the fresh position.
Intake Door Control Specification
AWIIA0144GB
AWIIA0145GB
2010 Pathfinder
INTAKE DOOR MOTOR
HAC-41
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the A/C auto amp. Motor rotation is
conveyed to a lever which activates the intake door.
Intake Door Motor Component Function Check
INFOID:0000000005256925
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1. Press the mode switch to vent mode(
).
2. Press REC (
) switch. The REC (
)indicator should illuminate.
3. Press REC (
) switch again. The REC (
) indicator should go out.
4. Listen for intake door position change (you should hear blower sound changes slightly).
Can a symptom be duplicated?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-83, "Intake Sensor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000005256926
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Check voltage between A/C auto amp. harness connector M49
terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
OK
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
WJIA1107E
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
21
22
Self-diagnostic
mode
Battery volt-
age
AWIIA0146ZZ
2010 Pathfinder
HAC-42
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
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 21, 22 and ground.
Is the inspection result normal?
OK
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR GROUND AND POWER
1. Press the BACK button to back out of self-diagnostic mode.
2. Check voltage between A/C auto amp. harness connector M49
terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
OK
>> GO TO 4.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
4.
CHECK INTAKE 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 21 and terminal 22.
Is the inspection result normal?
OK
>> Replace intake door motor. Refer to
.
NO
>> GO TO 5.
5.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the intake door motor harness connector.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 21, 22 and the intake door motor harness con-
nector M58 (B) terminal 1, 6.
Is the inspection result normal?
YES
>> Replace intake door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
21 - Ground
: Continuity should not exist.
22 - Ground
: Continuity should not exist.
AWIIA0147ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
22 21
Self-diagnostic
mode
Battery
voltage
AWIIA0148ZZ
Continuity should exist.
AWIIA0149ZZ
21 - 6
: Continuity should exist.
22 - 1
: Continuity should exist.
AWIIA0234ZZ
2010 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-43
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000005256927
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Variable blower control
• Front blower motor relay
• Front blower motor
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the A/C auto amp. and variable blower control
based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-
perature control (PTC).
When the air flow is increased, the blower motor speed is adjusted gradually to prevent a sudden increase in
air flow.
In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Blower Speed Control
Start up from cold soak condition (Automatic mode).
In a cold start up condition where the engine coolant temperature is below 50
°
C (122
°
F), the blower will not
operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies
depending on the ambient and engine coolant temperatures.
In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as
described above. After the coolant temperature reaches 50
°
C (122
°
F), or the 210 seconds has elapsed, the
blower speed will increase to the objective blower speed.
Start up from usual operating or hot soak condition (Automatic mode).
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
AWIIA0173GB
2010 Pathfinder
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