Nissan Frontier D40. Manual - part 734

MAGNET CLUTCH

HAC-39

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

•

WITHOUT CONSULT-III

GO TO 8.

NO

>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.

2.

CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL

Check A/C compressor ON/OFF signal. Refer to 

HAC-15, "CONSULT-III Function (BCM - AIR CONDI-

TIONER)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 8.

3.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to 

EC-394, "Diagnosis Procedure"

 (QR25DE) or 

EC-878, "Diagnosis

Procedure"

 (VQ40DE).

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace refrigerant pressure sensor. Refer to 

HA-38, "Removal and Installation for Refrigerant

Pressure Sensor"

.

4.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to 

BCS-21, "AIR CONDITIONER : CONSULT-III Function (BCM - AIR CON-

DITIONER)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 5.

5.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and front air control connector.

3.

Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M50 (B) termi-
nal 5.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

A/C SW ON

: AIR COND SW ON

A/C SW OFF

: AIR COND SW OFF

BLOWER CONTROL DIAL 
ON

: FAN ON SIG ON

BLOWER CONTROL DIAL 
OFF

: FAN ON SIG OFF

A

B

Connector

Terminal Connector

Terminal 

Continuity

BCM: M18

28 

Front air control: 

M50

5

Yes

AWIIA0418ZZ

HAC-40

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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 M50
terminal 5 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-54, "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-54, "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.

Turn ignition switch ON.

2.

Check voltage between front air control harness connector M50
terminal 4 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-54, "Removal

and Installation"

.

9.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air con-

trol connector

Terminal 

No.

M50

5

Ground

A/C switch: ON
Blower motor 
operates

0V

A/C switch: OFF

Battery voltage

AWIIA0419ZZ

Terminals

Condition

Voltage

(Approx.)

(+)

(-)

Front air 

control con-

nector

Terminal No.

M50

4

Ground

A/C switch: ON

0V

A/C switch: 

OFF

Battery voltage

AWIIA0417ZZ

MAGNET CLUTCH

HAC-41

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and front air control connector.

3.

Check continuity between BCM harness connector M18 terminal
27 and front air control harness connector M50 terminal 4.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair harness or connector.

10.

CHECK INTAKE SENSOR CIRCUITS

Check intake sensor. Refer to 

HAC-43, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace intake sensor. Refer to 

VTL-8, "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-54, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning part(s).

12.

CHECK MAGNET CLUTCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/C compressor connector.

3.

Check for operation sound when applying battery voltage to A/C
compressor terminal 1.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace magnet clutch. Refer to 

HA-30, "Removal and

Installation for Compressor Clutch"

.

13.

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

1.

Disconnect IPDM E/R connector.

2.

Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-33, "Removal and

Installation of IPDM E/R"

.

NO

>> Repair harness or connector.

27 - 4

: Continuity should exist.

AWIIA0416ZZ

WJIA1472E

11 – 1

: Continuity should exist.

WJIA1470E

HAC-42

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE SENSOR

INTAKE SENSOR

System Description

INFOID:0000000005275891

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:0000000005275892

Regarding Wiring Diagram information, refer to 

HAC-50, "Wiring Diagram - Air Conditioner Control - With

VBC"

.

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

AWIIA0433GB

2 - Ground

: Approx. 5V

WJIA1278E