Nissan Pathfinder (2008 year). Manual — part 439
HAC-56
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
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-59, "Rear Blower Motor And Relay Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace rear blower motor. Refer to
VTL-13, "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
BLOWER MOTOR CONTROL SYSTEM
HAC-57
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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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-59, "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 terminal 3N and 8N and rear blower motor harness connec-
tor B501 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.
WJIA0504E
HAC-58
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
NO
>> Inspection End.
15.
CHECK REAR BLOWER MOTOR
Check rear blower motor. Refer to
HAC-59, "Rear Blower Motor And Relay Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace rear blower motor. Refer to
VTL-13, "Removal and Installation"
.
16.
CHECK REAR BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1.
Turn ignition switch OFF.
2.
Disconnect fuse block (J/B) M3 harness connector and variable
blower control (rear).
3.
Check continuity between rear blower motor harness connector
B501 terminal 2 and ground.
Is the inspection result normal?
YES
>> Replace variable blower control (rear). Refer to
.
NO
>> Repair harness or connector.
17.
CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY
Check voltage between rear air control (front) harness connector R2
terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> Repair harness or connector.
18.
CHECK A/C AUTO AMP. FRONT AUX BLOWER POT CIRCUIT FOR SHORT
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. harness connector M50.
3.
Check continuity between rear air control (front) harness con-
nector R2 terminal 6 and ground.
Is the inspection result normal?
YES
>> Replace rear air control (front) Refer to
.
NO
>> Repair harness or connector.
Rear Air Control (Rear) Diagnosis Procedure #4
INFOID:0000000001430754
TROUBLE DIAGNOSIS PROCEDURE
1.
CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT REFERENCE VOLTAGE
1.
Turn ignition switch OFF.
Continuity should not exist.
AWIIA0251ZZ
Battery voltage should exist.
AWIIA0253ZZ
Continuity should not exist.
AWIIA0252ZZ
BLOWER MOTOR CONTROL SYSTEM
HAC-59
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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2.
Disconnect rear air control (rear) harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between rear air control (rear) harness connector
M208 terminal 6 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 3.
2.
CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check continuity between rear air control (rear) harness connec-
tor M208 terminal 1 and ground.
OK or NG
OK
>> Replace rear air control (rear). Refer to
.
NG
>> Repair harness or connector.
3.
CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT FOR SHORT
1.
Turn ignition switch OFF.
2.
Check continuity between rear air control (rear) harness connec-
tor M208 terminal 6 and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK REAR AIR CONTROL (REAR) REAR AUX BLOWER POT BETWEEN A/C AUTO AMP. AND REAR
AIR CONTROL REAR
1.
Disconnect A/C auto amp. harness connector.
2.
Check continuity between A/C auto amp. harness connector
M50 (A) terminal 52 and rear air control (rear) harness connec-
tor M208 (B) terminal 6.
OK or NG
OK
>> Replace A/C auto amp. Refer to
NG
>> Repair harness or connector.
Rear Blower Motor And Relay Component Inspection
INFOID:0000000001366722
COMPONENT INSPECTION
Rear Blower Motor Relay
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (rear): M208
6
Ground
5V
AWIIA0252ZZ
Continuity should exist.
AWIIA0254ZZ
Continuity should not exist.
AWIIA0252ZZ
Continuity should exist.
AWIIA0256ZZ
HAC-60
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
Check circuit continuity between terminals by supplying 12 volts and
ground to coil side terminals of relays.
Rear Blower Motor
Check that there are no foreign particles inside the intake unit.
Apply 12 volts to terminal 2 and ground to terminal 1 and ensure that
the blower motor rotates freely and quietly.
WJIA0973E
LJIA0115E
REAR AIR CONTROL SYSTEM
HAC-61
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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REAR AIR CONTROL SYSTEM
Rear Air Control System Description
INFOID:0000000001366723
SYSTEM DESCRIPTION
Component Parts
Rear air control system components are:
• A/C auto amp.
• Rear air control (front)
• Rear air control (rear)
• Air mix door motor (rear)
System Operation
Rear Air Control
When the REAR CTRL indicator is off the rear air control (front) will control all rear blower motor speeds and
the rear temperature/mode operations. When the REAR CTRL switch is pressed (indicator on), the rear air
control (rear) will control all the rear blower motor speeds and the rear temperature/mode operations.
Rear Air Control Component Function Check
INFOID:0000000001366724
SYMPTOM:
• Temperature cannot be adjusted from the rear air control.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (FRONT) OPERATIONAL CHECK
1.
Press AUTO switch (rear air controls only operate when front blower is on).
2.
Turn the rear blower motor to maximum speed from the rear air control (front).
3.
Turn rear air control (front) temperature/mode control dial clockwise and then counterclockwise (REAR
CTRL indicator off).
4.
Check for hot air at rear floor discharge air outlets in the maximum heat position and cold air at rear roof
discharge air outlets in the maximum cold position.
Does the rear air control (front) operate properly?
YES
>> GO TO 2.
NO
>> Check rear air control (front). Refer to
HAC-62, "Rear Air Control (Front) Diagnosis Procedure"
.
2.
CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) OPERATIONAL CHECK
1.
Press the REAR CTRL switch on rear air control (front) to send control to the rear air control (rear).
2.
Turn the rear blower motor to maximum speed from the rear air control (rear).
3.
Turn rear air control (rear) temperature/mode control dial slowly clockwise and then counterclockwise
(REAR CTRL indicator on).
WJIA2102E
HAC-62
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
4.
Check for hot air at rear floor discharge air outlets in the maximum heat position and cold air at rear roof
discharge air outlets in the maximum cold position.
Does the rear air control (rear) operate properly?
YES
>> GO TO 3.
NO
>> Check rear air control (rear). Refer to
HAC-64, "Rear Air Control (Rear) Diagnosis Procedure"
.
3.
CHECK FOR ANY SYMPTOMS
Perform a complete operational check (rear) for any symptoms.
Does another symptom exist?
YES
>> Refer to
HAC-4, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
.
NO
>> System OK.
4.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 5.
5.
CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) OPERATIONAL CHECK
Perform rear air control operation diagnosis to check for any codes. Refer to
.
Are any symptoms present?
YES
>> Refer to
HAC-106, "Symptom Matrix Chart"
.
NO
>> System OK.
Rear Air Control (Front) Diagnosis Procedure
INFOID:0000000001366725
DIAGNOSTIC PROCEDURE FOR REAR AIR CONTROL (FRONT)
SYMPTOM:
• Temperature/mode operation is malfunctioning.
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) REFERENCE VOLTAGE
Check voltage between rear air control (front) harness connector R2
terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 6.
3.
CHECK REAR AIR CONTROL (FRONT) AUX TEMP POT VOLTAGE
Battery voltage should exist.
AWIIA0253ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
3
Ground
4.5V
AWIIA0257ZZ
REAR AIR CONTROL SYSTEM
HAC-63
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Check voltage between rear air control (front) harness connector R2
terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 7.
4.
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
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK REAR AIR CONTROL (FRONT) REFERENCE GROUND CIRCUIT
Check continuity between rear air control (front) harness connector
R2 terminal 8 and ground.
Is the inspection result normal?
YES
>> Replace rear air control (front). Refer to
.
NO
>> GO TO 8.
6.
CHECK REAR AIR CONTROL (FRONT) REFERENCE VOLTAGE CIRCUIT
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 28 and rear air control (front) harness connec-
tor R2 (B) terminal 3.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
7.
CHECK REAR AIR CONTROL (FRONT) AUX TEMP POT CIRCUIT
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (front): R2
7
Ground
4.5V
AWIIA0258ZZ
Continuity should exist.
AWIIA0254ZZ
Continuity should exist.
AWIIA0259ZZ
Continuity should exist.
AWIIA0260ZZ
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