Nissan Pathfinder (2011 year). Manual — part 447
INTAKE DOOR MOTOR
HAC-39
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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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:0000000006243641
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).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-87, "Intake Sensor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000006243642
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
1.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector M49 and the intake door motor harness connector M58.
3. Check continuity between A/C auto amp. harness connector M49 terminals 21, 22 and the intake door
motor harness connector M58 terminals 1, 6.
4. Check continuity between A/C auto amp. harness connector M49 terminals 21, 22 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace harness as necessary.
2.
CHECK A/C AUTO AMP. FOR INTAKE AIR DOOR MOTOR POWER AND GROUND
WJIA1107E
Connector
Terminal
Connector
Terminal
Continuity
M49
21
M58
6
Yes
22
1
Connector
Terminal
—
Continuity
M49
21
Ground
No
22
2011 Pathfinder
HAC-40
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. 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?
YES
>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the
intake air door motor. Refer to
VTL-26, "Removal and Installation"
.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
21
22
Self-diagnostic mode (opening)
Battery voltage
22
21
Self-diagnostic mode (closing)
Battery voltage
2011 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-41
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000006243643
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
2011 Pathfinder
HAC-42
< DTC/CIRCUIT 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:0000000006243644
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.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-42, "Front Blower Motor Diagnosis Procedure"
Front Blower Motor Diagnosis Procedure
INFOID:0000000006243645
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
WJIA0441E
WJIA1111E
2011 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-43
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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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
2011 Pathfinder
HAC-44
< DTC/CIRCUIT 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-46, "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
2011 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-45
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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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-46, "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-46, "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
2011 Pathfinder
HAC-46
< DTC/CIRCUIT 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:0000000006243646
COMPONENT INSPECTION
Front Blower Motor Relay
1 - Ground
: Continuity should exist.
AWIIA0180ZZ
13 - Ground
: Approx. 4.5V
AWIIA1129ZZ
13 - 3
: Continuity should exist.
AWIIA0178ZZ
2011 Pathfinder
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