Nissan Pathfinder (2012 year). Manual - part 430

HAC-162

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

1. Reconnect BCM connector and front air control connector.

2. Turn ignition switch ON.

3. Turn A/C switch ON.

4. Check voltage between front air control harness connector M52

terminal 18 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-53, "Removal and Installation"

.

NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

BCS-53, "Removal

and Installation"

.

7.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace malfunctioning part(s).

8.

CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)

1. Reconnect BCM connector and front air control connector.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M52

terminal 10 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to 

BCS-53, "Removal

and Installation"

.

9.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1. Disconnect BCM connector and front air control connector.

2. Check continuity between BCM harness connector M18 terminal 27 and front air control harness connec-

tor M52 terminal 10.

3. Check continuity between BCM harness connector M18 terminal 27 and ground.

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air con-

trol connector

Terminal 

No.

M52

18

Ground

A/C switch: ON
Blower motor 
operates

0V

A/C switch: OFF

Battery voltage

WJIA1628E

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air 

control con-

nector

Terminal No.

M52

10

Ground

A/C switch: ON

Approx. 0V

A/C switch: 

OFF

Approx. 5V

WJIA1137E

27 - 10

: Continuity should exist.

August 2012

2012 Pathfinder

MAGNET CLUTCH

HAC-163

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair harness or connector.

10.

CHECK INTAKE SENSOR CIRCUITS

Check intake sensor. Refer to 

VTL-11, "Removal and Installation"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace intake sensor. Refer to 

VTL-11, "Removal and Installation"

.

11.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-53, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning part(s).

12.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage to terminal.
Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace magnet clutch. Refer to 

HA-40, "Removal and

Installation for Compressor Clutch"

.

13.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connector and A/C compressor (magnet clutch) connector.

3. Check continuity between IPDM E/R harness connector E119 terminal 11 and A/C compressor harness

connector F3 terminal 1.

4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and Installation of IPDM E/R"

.

NO

>> Repair harness or connector.

27 - ground

: Continuity should not exist.

WJIA1472E

11 – 1

: Continuity should exist.

11 – ground

: Continuity should not exist.

August 2012

2012 Pathfinder

HAC-164

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE SENSOR

INTAKE SENSOR

System Description

INFOID:0000000007356441

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor is located on top of the heater and cooling unit

assembly next to the A/C evaporator cover. It converts temperature

of air after it passes through the evaporator into a resistance value

which is then input to the front air control.

Intake Sensor Diagnosis Procedure

INFOID:0000000007356442

Regarding Wiring Diagram information, refer to 

HAC-172, "Wiring Diagram - Manual"

.

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. 

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1. Disconnect intake sensor connector.

2. Turn ignition switch ON.

3. Check voltage between intake sensor harness connector M146

terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

WJIA1155E

WJIA1156E

2 - Ground

: Approx. 5V

AWIIA0892ZZ

August 2012

2012 Pathfinder

INTAKE SENSOR

HAC-165

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between intake sensor harness connector

M146 (A) terminal 1 and front air control harness connector M52

(B) terminal 13.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

Refer to 

HAC-165, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace intake sensor. Refer to 

VTL-11, "Removal and Installation"

.

4.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and front air control harness connector M52

(A) terminal 12.

4. Check continuity between intake sensor harness connector

M146 (A) terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000007356443

COMPONENT INSPECTION

Intake Sensor

1 - 13

: Continuity should exist.

AWIIA0896ZZ

2 - 12

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0861ZZ

August 2012

2012 Pathfinder

HAC-166

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE SENSOR

After disconnecting intake sensor connector, measure resistance

between terminals 1 and 2 at sensor harness side, using the table

below.

If NG, replace intake sensor. Refer to 

VTL-11, "Removal and Installa-

tion"

.

Temperature 

°

C (

°

F)

Resistance k

Ω

−

15 (5)

209.0

−

10 (14)

160.0

−

5 (23)

123.0

0 (32)

95.8

5 (41)

74.9

10 (50)

58.9

15 (59)

46.7

20 (68)

37.3

25 (77)

30.0

30 (86)

24.2

35 (95)

19.7

40 (104)

16.1

45 (113)

13.2

WJIA1159E

August 2012

2012 Pathfinder

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-167

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000007356444

COMPONENT DESCRIPTION

Front Air Control

The front air control (1) has a built-in microcomputer which pro-

cesses information sent from various sensors needed for air condi-

tioner operation. The air mix door motor, mode door motor, intake

door motor, defroster door motor, blower motor and compressor are

then controlled.

The front air control is unitized with control mechanisms. When the

various switches and temperature dials are operated, data is input to

the front air control. 

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to

hot or any intermediate position by rotating the temperature dial.

Front Air Control Component Function Check

INFOID:0000000007356445

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1. Turn blower control dial to position 1-4, then press A/C switch.

2. Confirm that the compressor clutch engages (sound or visual inspection). 
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-167, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000007356446

Regarding Wiring Diagram information, refer to 

HAC-172, "Wiring Diagram - Manual"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA1197ZZ

WJIA1311E

August 2012

2012 Pathfinder

HAC-168

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

SYMPTOM: A/C system does not come on.

1.

CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Turn ignition switch ON.

4. Check voltage between front air control harness connector M52

terminals 6 and 19, and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to 

PG-72, "Terminal

Arrangement"

.

• If fuses are OK, check harness for open circuit. Repair or replace as necessary.

• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-

sary.

2.

CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Check continuity between front air control harness connector

M52 terminal 20 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

WJIA1461E

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Front air 

control 

connector

Terminal No.

M52

6 

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

M52

19 

Battery 
voltage

Battery 
voltage

Battery 
voltage

AWIIA0863ZZ

20 - Ground

: Continuity should exist.

AWIIA0864ZZ

August 2012

2012 Pathfinder

AIR CONDITIONER CONTROL

HAC-169

< ECU DIAGNOSIS INFORMATION >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS INFORMATION

AIR CONDITIONER CONTROL

System Description 

INFOID:0000000007356447

The front air control provides regulation of the vehicle's interior temperature. The system is based on the posi-

tion of the front air controls temperature switch selected by the driver. This is done by utilizing a microcom-

puter, also referred to as the front air control, which receives input signals from the following two sensors:

• Intake sensor

• PBR (position balanced resistor)

The front air control uses these signals (including the set position of the temperature switch) to control:

• Outlet air volume

• Air temperature

• Air distribution

System Operation

INFOID:0000000007356448

AIR MIX DOOR CONTROL

The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature

control dial.

BLOWER SPEED CONTROL

Blower speed is controlled based on front blower switch settings.

When blower switch is turned, the blower motor starts and increases air flow volume each time the blower

switch is turned counterclockwise, and decreases air flow volume each time the blower switch is turned coun-

terclockwise.

When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-

ing.

INTAKE DOORS CONTROL

The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.

MODE DOOR CONTROL

The mode door is controlled by the position of the mode dial.

DEFROSTER DOOR CONTROL

The defroster door is controlled by the defroster dial set to defroster.

MAGNET CLUTCH CONTROL

When the A/C switch is pressed, or the mode dial is turned to the defroster position, the front air control out-

puts a compressor ON signal to BCM.

The BCM then sends a compressor ON signal to ECM, via CAN communication line.

WJIA1293E

August 2012

2012 Pathfinder