Nissan Pathfinder (2012 year). Manual — part 414
HAC-34
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
NO
>> Repair or replace harness as necessary.
6.
CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL
1. Reconnect A/C auto amp. harness connectors.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.
4. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
7.
CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL
1. Reconnect the air mix door motor (driver) harness connector M147.
2. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (driver) for binding or mechanical failure. If air mix door (driver) moves freely,
replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Replace air mix door motor (driver). Refer to
VTL-30, "Removal and Installation"
Air Mix Door Motor (Passenger) Component Function Check
INFOID:0000000007356357
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.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-39, "Intake Door Motor Diagnosis Procedure"
Air Mix Door Motor (Passenger) Diagnosis Procedure
INFOID:0000000007356358
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5V
Connector
Terminal
—
Voltage (Approx.)
M49
6
Ground
0V
Connector
Terminal
—
Voltage (Approx.)
M49
6
Ground
0.2 to 4.8V
August 2012
2012 Pathfinder
AIR MIX DOOR MOTOR
HAC-35
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)
1.
CHECK AIR MIX DOOR MOTOR (PASSENGER) POSITION BALANCED RESISTOR (PBR) FEEDBACK
VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT, check "PAS MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32
°
C
(90
°
F) and 18
°
C (60
°
F).
Is the inspection result normal?
YES
>> • Air mix door motor (passenger) is OK.
• Inspect air mix door (passenger) for mechanical failure and repair if necessary. If air mix door
(passenger) is OK, refer to
HAC-112, "Component Function Check"
for insufficient cooling or
HAC-120, "Component Function Check"
for insufficient heating.
NO
>> GO TO 2.
2.
CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector M49 and the air mix door motor (passenger) harness
connector M143.
3. Check continuity between A/C auto amp. harness connector M49 terminals 2, 14 and the air mix door
motor (passenger) harness connector M143 terminals 5, 6.
4. Check continuity between A/C auto amp. harness connector M49 terminals 2, 14 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (PASSENGER) POWER AND GROUND
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial (passenger) to 32
°
C (90
°
F).
4. Check voltage between A/C auto amp. harness connector M49 terminal 2 and terminal 14 while rotating
temperature control dial (passenger) to 18
°
C (60
°
F) and back to 32
°
C (90
°
F).
Is the inspection result normal?
YES
>> GO TO 4.
Monitor Item
Condition
Results
PAS MIX FDBCK
Rotate temperature control dial (passenger) be-
tween 32
°
C (90
°
F) and 18
°
C (60
°
F)
Voltage varies between 0.2 and 4.8V.
Connector
Terminal
Connector
Terminal
Continuity
M49
14
M143
6
Yes
2
5
Connector
Terminal
—
Continuity
M49
14
Ground
No
2
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
2
14
Rotate temperature control dial (pas-
senger) to 18
°
C (60
°
F)
Battery voltage
14
2
Rotate temperature control dial (pas-
senger) to 32
°
C (90
°
F)
Battery voltage
August 2012
2012 Pathfinder
HAC-36
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
4.
CHECK AIR MIX DOOR MOTOR (PASSENGER) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connectors M49 and M50.
3. Check continuity between A/C auto amp. harness connector M49 terminal 3 and M50 terminal 28 and air
mix door motor (passenger) harness connector M143 terminal 1, 3.
4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between A/C auto amp. harness connector M50 terminal 29 and air mix door motor (pas-
senger) harness connector M143 terminal 2.
2. Check continuity between A/C auto amp. harness connector M50 terminal 29 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
6.
CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL
1. Reconnect A/C auto amp. harness connectors.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.
4. Check voltage between A/C auto amp. harness connector M50 terminal 29 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
Connector
Terminal
Connector
Terminal
Continuity
M49
3
M143
3
Yes
M50
28
1
Connector
Terminal
—
Continuity
M49
3
Ground
No
M50
28
Connector
Terminal
Connector
Terminal
Continuity
M50
29
M143
2
Yes
Connector
Terminal
—
Continuity
M50
29
Ground
No
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M50
28
M49
3
5V
Connector
Terminal
—
Voltage (Approx.)
M50
29
Ground
0V
August 2012
2012 Pathfinder
AIR MIX DOOR MOTOR
HAC-37
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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HAC
N
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P
7.
CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL
1. Reconnect the air mix door motor (passenger) harness connector M143.
2. Check voltage between A/C auto amp. harness connector M50 terminal 29 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door (passenger) for binding or mechanical failure. If air mix door (passenger)
moves freely, replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
NO
>> Replace the air mix door motor (passenger). Refer to
VTL-30, "Removal and Installation"
Connector
Terminal
—
Voltage (Approx.)
M50
29
Ground
0.2 to 4.8V
August 2012
2012 Pathfinder
HAC-38
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
System Description
INFOID:0000000007356359
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, FOOT or OFF switches are
pushed, the A/C auto amp. sets the intake door at the fresh position.
Intake Door Control Specification
AWIIA0144GB
AWIIA0145GB
August 2012
2012 Pathfinder
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:0000000007356360
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:0000000007356361
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
August 2012
2012 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-27, "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
August 2012
2012 Pathfinder
BLOWER MOTOR CONTROL SYSTEM
HAC-41
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
N
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BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000007356362
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
August 2012
2012 Pathfinder
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