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Nissan Pathfinder (2012 year). Manual - part 414

HAC-34

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

>> Repair or replace harness as necessary.

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.

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

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"

>> 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

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.

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.

>> 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

M49

Connector

Terminal

—

Voltage (Approx.)

M49

Ground

Connector

Terminal

—

Voltage (Approx.)

M49

Ground

0.2 to 4.8V

August 2012

2012 Pathfinder

AIR MIX DOOR MOTOR

HAC-35

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)

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

HAC-21,

"CONSULT Function (HVAC)"

3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32

(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.

>> GO TO 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.

>> Repair or replace harness as necessary.

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

Voltage varies between 0.2 and 4.8V.

Connector

Terminal

Connector

Terminal

Continuity

M49

M143

Yes

Connector

Terminal

—

Continuity

M49

Ground

Connector

Terminals

Condition Voltage

(Approx.)

(+) (-)

M49

Rotate temperature control dial (pas-

senger) to 18

C (60

Battery voltage

Rotate temperature control dial (pas-

senger) to 32

C (90

Battery voltage

August 2012

2012 Pathfinder

HAC-36

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

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.

>> Repair or replace harness as necessary.

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.

>> Repair or replace harness as necessary.

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.

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

Connector

Terminal

Connector

Terminal

Continuity

M49

M143

Yes

M50

Connector

Terminal

—

Continuity

M49

Ground

M50

Connector

Terminal

Connector

Terminal

Continuity

M50

M143

Yes

Connector

Terminal

—

Continuity

M50

Ground

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-)

M50

M49

Connector

Terminal

—

Voltage (Approx.)

M50

Ground

August 2012

2012 Pathfinder

AIR MIX DOOR MOTOR

HAC-37

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

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"

>> Replace the air mix door motor (passenger). Refer to

VTL-30, "Removal and Installation"

Connector

Terminal

—

Voltage (Approx.)

M50

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]

HAC

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

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.

>> 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.

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.

>> Repair or replace harness as necessary.

CHECK A/C AUTO AMP. FOR INTAKE AIR DOOR MOTOR POWER AND GROUND

WJIA1107E

Connector

Terminal

Connector

Terminal

Continuity

M49

M58

Yes

Connector

Terminal

—

Continuity

M49

Ground

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"

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

Connector

Terminals

Condition Voltage

(Approx.)

(+) (-)

M49

Self-diagnostic mode (opening)

Battery voltage

Self-diagnostic mode (closing)

Battery voltage

August 2012

2012 Pathfinder

BLOWER MOTOR CONTROL SYSTEM

HAC-41

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

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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