Nissan Pathfinder (2009 year). Instruction — part 457
BLOWER MOTOR CONTROL SYSTEM
HAC-51
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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A
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HAC
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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
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 - 2
: Continuity should exist.
AWIIA0179ZZ
3 - 4
: Continuity should exist.
AWIIA0243ZZ
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
13 - Ground
: Approx. 4.5V
AWIIA1129ZZ
2009 Pathfinder
HAC-52
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
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:0000000003935900
COMPONENT INSPECTION
Front Blower Motor Relay
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:0000000003935901
SYSTEM DESCRIPTION
Component Parts
Rear blower speed control system components are:
• A/C auto amp.
13 - 3
: Continuity should exist.
AWIIA0178ZZ
LJIA0068E
WJIA1508E
2009 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-53
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
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M
A
B
HAC
N
O
P
• 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
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:0000000003935902
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
54, "Rear Air Control (Front) Diagnosis Procedure #1"
.
AWIIA0181GB
2009 Pathfinder
HAC-54
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
• Rear blower motor operates in high speed all the time or does not match the rear air control
(front) speed selected. Refer to
HAC-55, "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-56, "Rear Air Control (Rear) Diagnosis Procedure #3"
3.
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
>> GO TO 4.
NO
>> Check rear air control (rear). Refer to
HAC-59, "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:0000000003935903
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
2009 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-55
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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J
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A
B
HAC
N
O
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Check continuity between rear air control (front) harness connector
R2 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
Rear Air Control (Rear) Diagnosis Procedure #2
INFOID:0000000003935904
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
>> GO TO 4.
3.
CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between rear air control (front) harness con-
nector R2 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace rear air control (front). Refer to
.
NO
>> Repair harness or connector.
4.
CHECK REAR AIR CONTROL (FRONT) BLOWER POT CIRCUIT FOR OPEN
Continuity should exist.
AWIIA0254ZZ
Battery voltage should exist.
AWIIA0253ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
6
Ground
5V
AWIIA0252ZZ
Continuity should exist.
AWIIA0254ZZ
2009 Pathfinder
HAC-56
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between A/C auto amp. harness connector
M50 (A) terminal 38 and rear air control (front) harness connec-
tor R2 (B) terminal 6.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
Rear Air Control (Rear) Diagnosis Procedure #3
INFOID:0000000003935905
TROUBLE DIAGNOSIS PROCEDURE
1.
CHECK REAR AIR CONTROL (FRONT)
1.
Disconnect rear air control (front) connector.
2.
Turn ignition switch ON.
3.
Press AUTO switch.
Does rear blower motor operate in high speed?
YES
>> GO TO 17.
NO
>> GO TO 2.
2.
CHECK REAR BLOWER MOTOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect rear blower motor harness connector.
3.
Turn ignition switch ON.
4.
Press AUTO switch.
5.
Rotate rear air control (front) blower speed control dial to maxi-
mum speed (REAR CTRL indicator off).
6.
Check voltage between rear blower motor harness connector
B201 terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 9.
3.
CHECK VARIABLE BLOWER CONTROL (REAR) POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect variable blower control (rear) connector.
3.
Turn ignition switch ON.
4.
Check voltage between variable blower control connector B133
terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED SIGNAL CIRCUIT FOR SHORT
Continuity should exist.
AWIIA0244ZZ
Battery voltage should exist.
AWIIA0255ZZ
Battery voltage should exist.
AWIIA0245ZZ
2009 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-57
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check voltage between variable blower control (rear) harness con-
nector B133 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 8.
5.
CHECK VARIABLE BLOWER CONTROL (REAR) GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between variable blower control (rear) harness
connector B133 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK REAR BLOWER MOTOR
Check rear blower motor. Refer to
HAC-60, "Rear Blower Motor And Relay Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace rear blower motor. Refer to
VTL-12, "Removal and Installation"
.
7.
CHECK VARIABLE BLOWER CONTROL (REAR) BLOWER MOTOR GROUND CIRCUIT
Check continuity between rear blower motor connector B501 (B) ter-
minal 1 and variable blower control (rear) connector B133 (A) termi-
nal 2.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
8.
CHECK VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between A/C auto amp. harness connector
M49 (A) terminal 12 and variable blower control (rear) harness
connector B133 (B) terminal 3.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
9.
CHECK FUSES
Check 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)].
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Variable blower control: B133
3
Ground
4.5 V
AWIIA0246ZZ
Continuity should exist.
AWIIA0247ZZ
Continuity should exist.
AWIIA0248ZZ
Continuity should exist.
AWIIA0249ZZ
2009 Pathfinder
HAC-58
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 14.
10.
CHECK REAR BLOWER MOTOR RELAY
Check rear blower motor relay. Refer to
HAC-60, "Rear Blower Motor And Relay Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace rear blower motor relay.
11.
CHECK REAR BLOWER MOTOR CIRCUIT BETWEEN REAR BLOWER MOTOR AND FUSE BLOCK (J/
B)
1.
Turn ignition switch OFF.
2.
Disconnect fuse block (J/B) M3 harness connector.
3.
Check continuity between fuse block (J/B) harness connector
M3 (A) terminal 3N and 8N and rear blower motor harness con-
nector B501 (B) terminal 2.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair harness or connector.
12.
CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between fuse block (J/B) harness connector M3
terminal 7N and ground.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair harness or connector.
13.
CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT FOR OPEN
1.
Turn ignition switch ON.
2.
Check voltage between rear blower motor relay harness con-
nector J-1 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace fuse block (J/B).
NO
>> Repair harness or connector.
14.
REPLACE FUSE
1.
Turn ignition switch OFF.
2.
Replace fuses.
3.
Reconnect all disconnected parts.
4.
Turn ignition switch ON.
5.
Activate the rear blower motor from the rear air control (front).
Does the fuse blow?
YES
>> GO TO 15.
Continuity should exist.
AWIIA0250ZZ
Continuity should exist.
LJIA0102E
Battery voltage should exist.
AWIIA1192ZZ
2009 Pathfinder
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