Nissan Pathfinder (2010 year). Manual — part 446
HAC-44
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the A/C auto amp. causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the A/C auto amp.
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
Front Blower Motor Component Function Check
INFOID:0000000005256928
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER MOTOR
1. Press the blower (+) switch. Blower should operate.
2. Press the blower (+) switch and continue checking blower speed and fan symbol until all speeds are
checked.
Can the symptom be duplicated?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-44, "Front Blower Motor Diagnosis Procedure"
Front Blower Motor Diagnosis Procedure
INFOID:0000000005256929
Regarding Wiring Diagram information, refer to
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
WJIA0441E
WJIA1111E
2010 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-45
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
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M
A
B
HAC
N
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SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
1.
CHECK FUSES
Check 15A fuses [No. 24 and 27 (Located in the fuse and fusible link box)].
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 8.
2.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector.
3. Turn ignition switch ON.
4. Press the A/C switch.
5. Press the front blower control "+" switch to maximum speed.
6. Check voltage between front blower motor harness connector
M62 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 3.
3.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front blower motor relay.
3. Check voltage between front blower motor relay harness con-
nector E22 terminals 5, 7 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
AWIIA0242ZZ
Fuses are good.
2 - Ground
: Battery voltage
WJIA1331E
5 - Ground
: Battery voltage
7 - Ground
: Battery voltage
WJIA1634E
2010 Pathfinder
HAC-46
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
4.
CHECK FRONT BLOWER MOTOR RELAY
Turn ignition switch OFF.
Check front blower motor relay. Refer to
HAC-150, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace front blower motor relay.
5.
CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) CIRCUIT FOR OPEN
Check continuity between front blower motor relay harness connec-
tor E22 terminals 3, 6 and front blower motor harness connector
M62 terminal 2.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect variable blower control harness connector.
2. Check continuity between front blower motor relay harness con-
nector E22 (A) terminals 3, 6 and variable blower control har-
ness connector M122 (B) terminal 4.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK FRONT BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between front blower motor relay harness con-
nector E22 terminal 1 and ground.
Is the inspection result normal?
YES
>> Repair front blower motor ground circuit or connector.
NO
>> Repair harness or connector.
8.
REPLACE FUSES
Replace fuses.
Does the fuse blow?
YES
>> • If fuse blows without activating the front blower motor, repair short between fuse and front
blower motor relay.
• If fuse blows activating the front blower motor, GO TO 9.
NO
>> Inspection End.
9.
CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
3, 6 - 2
: Continuity should exist.
WJIA1333E
3, 6 - 4
: Continuity should exist.
AWIIA0243ZZ
1 - Ground
: Battery voltage
WJIA0504E
2010 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-47
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
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M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector, front blower motor
relay and variable blower control connector.
3. Check continuity between variable blower control harness con-
nector M122 terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair harness or connector.
10.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-150, "Front Blower Motor Component Inspection"
Is the inspection result normal?
YES
>> Replace variable blower control (front). Refer to
VTL-14, "Removal and Installation"
NO
>> Replace front blower motor. Refer to
VTL-12, "Removal and Installation"
11.
CHECK FRONT BLOWER MOTOR
Check front blower motor. Refer to
HAC-48, "Front Blower Motor Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Replace front blower motor. Refer to
VTL-12, "Removal and Installation"
12.
CHECK BLOWER MOTOR GROUND CIRCUIT
1. Disconnect variable blower control (front) connector.
2. Check continuity between front blower motor harness connector
M62 (B) terminal 1 and variable blower control harness connec-
tor M122 (A) terminal 2.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair harness or connector.
13.
CHECK VARIABLE BLOWER CONTROL POWER SUPPLY CIRCUIT FOR OPEN
1. Disconnect front blower motor relay.
2. Check continuity between front blower motor relay harness con-
nector E22 (A) terminals 3, 5 and variable blower control har-
ness connector M122 (B) terminal 4.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair harness or connector.
14.
CHECK VARIABLE BLOWER CONTROL GROUND CIRCUIT
4 - Ground
: Continuity should not exist.
AWIIA0177ZZ
1 - 2
: Continuity should exist.
AWIIA0179ZZ
3 - 4
: Continuity should exist.
AWIIA0243ZZ
2010 Pathfinder
HAC-48
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Check continuity between variable blower control harness connector
M122 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Repair harness or connector.
15.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT
1. Reconnect all disconnected component connectors.
2. Disconnect A/C auto amp. connector.
3. Turn ignition switch ON.
4. Press the blower (+) switch to maximum speed.
5. Check voltage between A/C auto amp. harness connector M49
terminal 13 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> GO TO 16.
16.
CHECK VARIABLE BLOWER CONTROL SIGNAL CIRCUIT FOR OPEN
1. Disconnect variable blower control connector.
2. Check continuity between A/C auto amp. harness connector
M49 (B) terminal 13 and variable blower control harness con-
nector M122 (A) terminal 3.
Is the inspection result normal?
YES
>> Replace variable blower control (front). Refer to
.
NO
>> Repair harness or connector.
Front Blower Motor Component Inspection
INFOID:0000000005256930
COMPONENT INSPECTION
Front Blower Motor Relay
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
13 - Ground
: Approx. 4.5V
AWIIA1129ZZ
13 - 3
: Continuity should exist.
AWIIA0178ZZ
2010 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-49
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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HAC
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Check continuity between terminals 6-7 and 3-5 by supplying 12
volts to terminal 1 and ground to terminal 2 of relay.
Front Blower Motor
Confirm smooth rotation of the blower motor.
• Ensure that there are no foreign particles inside the blower unit.
• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that
the motor operates freely and quietly.
Rear Blower Motor Description
INFOID:0000000005256931
SYSTEM DESCRIPTION
Component Parts
Rear blower speed control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Rear air control (front)
• Rear air control (rear)
• Variable blower control (rear)
• Rear blower motor
• Rear blower motor relay
LJIA0068E
WJIA1508E
2010 Pathfinder
HAC-50
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
System Operation
Rear Blower Control
When the rear blower control dial (front) REAR CTRL switch is pressed (indicator on), it allows the rear air
control (rear) to control the rear blower motor speed. If the REAR CTRL switch is off (indicator off), the rear air
control (front) controls the rear blower motor speed regardless of the rear air control (rear) position.
Rear Blower Motor Component Function Check
INFOID:0000000005256932
SYMPTOM:
• Rear blower motor does not operate from the rear air control (front) and the rear air control (rear).
• Rear blower motor operates from rear air control (front) only.
• Rear blower motor operates from rear air control (rear) only.
• Rear blower motor speed does not match the rear air control (front) speed selected.
• Rear blower motor speed does not match the rear air control (rear) speed selected.
• Rear blower motor operates in high all the time when controlled from the rear air control (front).
• Rear blower motor operates in high all the time when controlled from the rear air control (rear).
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REAR AIR CONTROL (FRONT)
1. Press AUTO switch.
2. Turn the rear air control (front) blower control dial to the lowest speed and check for rear blower operation
(REAR CTRL indicator off).
3. Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.
Does the rear blower motor operate correctly?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REAR AIR CONTROL (REAR)
1. Press the REAR CTRL switch (indicator on) on the rear air control (front) to send control of the rear blower
motor back the rear air control (rear).
2. Turn the rear air control (rear) blower control dial to the lowest speed and check for rear blower operation.
3. Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.
Does the rear blower motor operate correctly?
YES
>> • Rear blower motor does not operate at any speed from the rear air control (front). Refer to
51, "Rear Air Control (Front) Diagnosis Procedure #1"
.
• Rear blower motor operates in high speed all the time or does not match the rear air control
(front) speed selected. Refer to
HAC-52, "Rear Air Control (Rear) Diagnosis Procedure #2"
NO
>> • Rear blower motor does not operate from the rear air control (front) and the rear air control
HAC-53, "Rear Air Control (Rear) Diagnosis Procedure #3"
3.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REAR AIR CONTROL (REAR)
AWIIA0181GB
2010 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-51
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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1. Press the REAR CTRL switch (indicator on) on the rear air control (front) to send control of the rear blower
motor back the rear air control (rear).
2. Turn the rear air control (rear) blower control dial to the lowest speed and check for rear blower operation.
3. Continue checking that rear blower speed increases as the rear blower control dial is rotated clockwise.
Does the rear blower motor operate correctly?
YES
>> GO TO 4.
NO
>> Check rear air control (rear). Refer to
HAC-56, "Rear Air Control (Rear) Diagnosis Procedure #4"
.
4.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 5.
5.
RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
HAC-5, "Operational Check (Front)"
.
Does another symptom exist?
YES
>> Refer to
HAC-4, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
.
NO
>> Inspection End.
Rear Air Control (Front) Diagnosis Procedure #1
INFOID:0000000005256933
Regarding Wiring Diagram information, refer to
TROUBLE DIAGNOSIS PROCEDURE
1.
CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY
1. Disconnect rear air control (front) harness connector.
2. Turn ignition switch ON.
3. Check voltage between rear air control (front) harness connec-
tor R2 terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK REAR AIR CONTROL (FRONT) FRONT AUX BLOWER POT REFERENCE VOLTAGE
1. Disconnect rear air control (front) harness connector.
2. Turn ignition switch ON.
3. Check voltage between rear air control (front) harness connec-
tor R2 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT
Battery voltage should exist.
AWIIA0253ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
6
Ground
5V
AWIIA0252ZZ
2010 Pathfinder
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