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Nissan Pathfinder (2011 year). Manual - part 445

DIAGNOSIS SYSTEM (BCM)

HAC-23

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

AIR CONDITIONER
AIR CONDITIONER : CONSULT-III Function (BCM - AIR CONDITIONER)

INFOID:0000000006710644

DATA MONITOR

Monitor Item [Unit]

Description

IGN ON SW [On/Off]

Indicates condition of ignition switch ON position.

FAN ON SIG [On/Off]

Indicates condition of fan switch.

AIR COND SW [On/Off]

Indicates condition of A/C switch.

2011 Pathfinder

HAC-24

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

SELF-DIAGNOSIS FUNCTION

SELF-DIAGNOSIS FUNCTION

A/C Auto Amp. Self-Diagnosis

INFOID:0000000006243629

A/C SYSTEM SELF-DIAGNOSIS FUNCTION

The self-diagnosis function is built into the A/C auto amp. to quickly locate the cause of malfunctions.

DESCRIPTION

The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to

applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-

ature display area. Refer to

HAC-25, "A/C System Self-Diagnosis Code Chart"

SELF-DIAGNOSTIC MODE

NOTE:

Radio must be OFF.

1. Turn the ignition switch ON.

2. On the A/C and AV switch assembly, press the "SETTING" but-

ton and twist the volume knob clockwise and counterclockwise

until the Self-Diagnosis screen shows on the display.

3. Scroll down to "Confirmation/Adjustment" and press the

"ENTER" button.

4. Scroll down to "Climate Control" and press the "ENTER" button.

5. The fan bars will flash on the display during the self-test, and

then the fault codes will display in the ambient temperature area.

They will continue scrolling until diagnostic mode is exited.

6. Exit by pressing the "BACK" button on A/C and AV switch

assembly until display returns to its normal operation screen.

HVAC system will be OFF or by turning the ignition switch OFF.

The self-diagnostic system diagnoses sensors, CAN system, and battery voltage on A/C auto amp. Refer to

applicable sections (items) for details. Fault codes (if any are present) will be displayed in the ambient temper-

ature display area. Refer to

HAC-25, "A/C System Self-Diagnosis Code Chart"

A/C and AV Switch Assembly Self-Diagnosis

INFOID:0000000006243630

A/C and AV switch assembly self-diagnosis function

The ON/OFF operation (continuity) of each switch in the A/C and AV switch assembly can be checked.

Self-diagnosis mode

AWNIA0098ZZ

AWIIA0081ZZ

2011 Pathfinder

SELF-DIAGNOSIS FUNCTION

HAC-25

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

• Press the “BACK” switch and the “UP” switch within 10 seconds

after turning the ignition switch from OFF to ACC and hold them for

3 seconds or more. Then the buzzer sounds, all indicators of the

preset switch illuminate, and the self-diagnosis mode starts.

• The continuity of each switch and control dials (A/C and AV switch

assembly only) at the ON position can be checked by pressing

each switch and turning each control dial. The buzzer sounds and

LED's will illuminate if the switch is normal.

Finishing self-diagnosis mode

Self-diagnosis mode is canceled when turning the ignition switch OFF.

A/C System Self-Diagnosis Code Chart

INFOID:0000000006243631

SELF-DIAGNOSTIC CODE CHART

AWIIA0171GB

Code No.

Reference page

EE changed by calibration

VTL-7, "Removal and Installation"

Battery voltage out of range

CHG-9, "Diagnosis Procedure"

Passenger air mix door open/short/out of limits

HAC-34, "Air Mix Door Motor (Passenger) Diagnosis Proce-
dure"

Driver air mix door open/short

HAC-32, "Air Mix Door Motor (Driver) Diagnosis Procedure"

In-vehicle sensor circuit out of range (low)

HAC-82, "In-Vehicle Sensor Diagnosis Procedure"

In-vehicle sensor circuit out of range (high)

Air mix door motor (rear) circuit failure

HAC-57, "Rear Air Control Component Function Check"

Ambient sensor circuit short

HAC-79, "Ambient Sensor Diagnosis Procedure"

Ambient sensor circuit open

Intake door motor open

HAC-39, "Intake Door Motor Diagnosis Procedure"

Intake door motor short

Optical sensor (Driver) circuit open or short

HAC-85, "Optical Sensor Diagnosis Procedure"

Optical sensor (Passenger) circuit open or short

Intake sensor circuit short

HAC-164, "Intake Sensor Diagnosis Procedure"

Intake sensor circuit open

CAN bus fault

LAN-14, "Trouble Diagnosis Flow Chart"

BCM message missing

Intake door motor circuit malfunction

HAC-39, "Intake Door Motor Diagnosis Procedure"

Stuck button

VTL-7, "Removal and Installation"

Mode door motor circuit malfunction

HAC-27, "Mode Door Motor (Front) Component Function
Check"

2011 Pathfinder

HAC-26

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

DTC/CIRCUIT DIAGNOSIS

MODE DOOR MOTOR

System Description

INFOID:0000000006243632

SYSTEM DESCRIPTION

Component Parts

Mode door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Mode door motor (front)

• PBR (built into mode door motor)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/C auto amp. by means of the mode

door motor (front). When a mode door position is selected on the A/C auto amp., voltage is applied to one cir-

cuit of the mode door motor (front) while ground is applied to the other circuit, causing the mode door motor

(front) to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one

has ground applied to it. The A/C auto amp. monitors the mode door position by measuring the voltage signal

on the PBR circuit.

In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position

based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature

selected by the driver or passenger.

Mode Door Control Specification

COMPONENT DESCRIPTION

Mode Door Motor (Front)

AWIIA0092GB

AWIIA0093GB

2011 Pathfinder

MODE DOOR MOTOR

HAC-27

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

The mode door motor (front) is attached to the heater & cooling unit

assembly. It rotates so that air is discharged from the outlet as indi-

cated by the A/C auto amp. Motor rotation is conveyed to a link

which activates the mode door.

Mode Door Motor (Front) Component Function Check

INFOID:0000000006243633

INSPECTION FLOW

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR

1. Press mode switch four times and then press the

(DEF) switch. Each position indicator should change

shape (on display).

2. Confirm that discharge air comes out according to the air distribution table. Refer to

HAC-18, "Discharge

Air Flow (Front)"

NOTE:

Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH

when FOOT (

), DEF (

) or D/F (

) is selected.

Is the inspection result normal?

YES

>> Inspection End.

>> Go to diagnosis procedure. Refer to

HAC-27, "Mode Door Motor (Front) Diagnosis Procedure"

Mode Door Motor (Front) Diagnosis Procedure

INFOID:0000000006243634

Regarding Wiring Diagram information, refer to

HAC-95, "Wiring Diagram - Automatic"

SYMPTOM:

• Air outlet does not change.

• Mode door motor does not operate normally.

CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE

1. Turn ignition switch ON.

2. Using CONSULT-III, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to

HAC-21,

"CONSULT-III Function (HVAC)"

3. Observe "MODE FDBCK" voltage while cycling A/C auto amp. mode switch through all modes.

Is the inspection result normal?

YES

>> • Mode door motor is OK.

• Inspect mode door for mechanical failure. Refer to

VTL-27, "Removal and Installation"

>> GO TO 2.

CHECK MODE 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 mode door motor harness connector

M142.

3. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 and the mode door

motor harness connector M142 terminals 5, 6.

WJIA1084E

Monitor Item

Condition

Results

MODE FDBCK

Cycle mode switch through all modes, D/F

(

), VENT (

), B/L (

), and FOOT(

)

Voltage varies between D/F (

) and VENT (

), and

between VENT (

) and B/L (

2011 Pathfinder

HAC-28

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

4. Check continuity between A/C auto amp. harness connector M49 terminals 19, 20 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair or replace harness as necessary.

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

1. Reconnect A/C auto amp. harness connector.

2. Turn ignition switch ON.
3. Press the mode switch to the D/F (

) mode.

4. Check voltage between A/C auto amp. harness connector M49 terminal 19 and terminal 20 while pressing

the mode switch to the VENT (

), and then the B/L (

) mode.

Is the inspection result normal?

YES

>> GO TO 4.

>> Replace A/C auto amp.. Refer to

VTL-7, "Removal and Installation"

CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connectors.

3. Check continuity between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28 and the

mode door motor harness connector M142 terminals 2, 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 M49 terminal 7 and mode door motor har-

ness connector M142 terminal 4.

Connector

Terminal

Connector

Terminal

Continuity

M49

M142

Yes

Connector

Terminal

—

Continuity

M49

Ground

Connector

Terminals

Condition Voltage

(Approx.)

(+) (-)

M49

D/F (

) mode to VENT (

) mode

Battery voltage

VENT (

) mode to B/L (

) mode

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M49

M142

Yes

M50 28

Connector

Terminal

—

Continuity

M49

Ground

M50

2011 Pathfinder

MODE DOOR MOTOR

HAC-29

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

2. Check continuity between A/C auto amp. harness connector M49 terminal 7 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 M49 terminal 7 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 mode door motor harness connector M142.

2. Check voltage between A/C auto amp. harness connector M49 terminal 7 and ground.

Is the inspection result normal?

YES

>> Inspect mode door for binding or mechanical failure. If mode door moves freely, replace A/C auto

amp.. Refer to

VTL-7, "Removal and Installation"

>> Replace the mode door motor. Refer to

VTL-27, "Removal and Installation"

Connector

Terminal

Connector

Terminal

Continuity

M49

M142

Yes

Connector

Terminal

—

Continuity

M49

Ground

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

2011 Pathfinder

HAC-30

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000006243635

SYSTEM DESCRIPTION

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Air mix door motors (driver, passenger, and rear)

• PBR (built-into air mix door motors)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The A/C auto amp. receives data from the temperature selected by the driver side, passenger side, and rear.

The A/C auto amp. then applies a voltage to one circuit of the appropriate air mix door motor, while ground is

applied to the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is

determined by which circuit has voltage applied to it, and which one has ground applied to it. The A/C auto

amp. monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.

In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the A/C auto amp. which

determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,

intake sensor, and the temperature selected by the driver and front and rear passengers.

Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new

door position data is returned to the A/C auto amp.

AWIIA0106GB

2011 Pathfinder

Content .. 443 444 445 446 ..