Nissan Pathfinder. Manual - part 717

DOOR MOTOR COMMUNICATION CIRCUIT

HAC-129

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.

NO

>> Repair harness or connector.

HAC-130

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

FRONT BLOWER MOTOR

FRONT BLOWER MOTOR

Diagnosis Procedure

INFOID:0000000009176867

Regarding Wiring Diagram information, refer to 

HAC-49, "Wiring Diagram"

.

1.

CHECK FUSE

1. Turn ignition switch OFF.

2. Check 15A fuses [Nos. 17 and 27, located in fuse block (J/B)]. 

NOTE:

Refer to 

PG-81, "Terminal Arrangement"

. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit. 

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY

1. Disconnect front blower motor connector.

2. Turn ignition switch ON.

3. Check voltage between front blower motor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

CHECK FRONT BLOWER MOTOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between front blower motor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector. 

4.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT

1. Disconnect A/C auto amp. connector. 

2. Check continuity between front blower motor harness connector and A/C auto amp. harness connector. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair the harness or connector.

5.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL

+

−

Voltage

Front blower motor

Connector

Terminal

M112

4

Ground

Battery voltage

Front blower motor

—

Continuity

Connector

Terminal

M112

1

Ground

Yes

Front blower motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M112

3

M50

18

Yes

FRONT BLOWER MOTOR

HAC-131

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Reconnect front blower motor connector and A/C auto amp. connector. 

2. Turn ignition switch ON.

3. Operate MODE switch to set air outlet to VENT. 

4. Change fan speed from Lo to Hi, and check duty ratios between front blower motor harness connector

and ground by using an oscilloscope. 

NOTE:

Calculate drive signal duty ratio as shown in the figure.

T2 = Approx. 1.6 ms

Is the inspection result normal?

YES

>> Replace front blower motor. Refer to 

VTL-20, "FRONT BLOWER MOTOR : Removal and Installa-

tion"

.

NO

>> Replace A/C auto amp. Refer to 

HAC-157, "Removal and Installation"

.

6.

CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between fuse block (J/B) harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector. 

7.

CHECK FRONT BLOWER RELAY

Check front blower motor relay. Refer to 

HAC-131, "Component Inspection (Front Blower Motor Relay)"

.

Is the inspection result normal?

YES

>> Repair harness or connector between front blower motor and fuse block (J/B).

NO

>> Replace front blower relay.

Component Inspection (Front Blower Motor)

INFOID:0000000009176868

1.

CHECK FRONT BLOWER MOTOR

1. Connect battery voltage to terminal 1 of front blower motor.

2. Connect ground to terminal 2 of front blower motor.
Does the front blower fan operate?

YES

>> Intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace front blower motor. Refer to 

VTL-20, "FRONT BLOWER MOTOR : Removal and Installa-

tion"

.

Component Inspection (Front Blower Motor Relay)

INFOID:0000000009176869

1.

CHECK BLOWER RELAY

Front blower motor

Condition

Duty ratio

(Approx.)

Connector

Terminal

Fan speed (manual)

VENT mode

M112

3

1st

25 %

2nd

33 %

3rd

41 %

4th

51 %

5th

61 %

6th

69 %

7th

81 %

JPLIA1210GB

Fuse block (J/B)

—

Continuity

Connector

Terminal

M68

13R

Ground

Yes

HAC-132

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

FRONT BLOWER MOTOR

1. Turn ignition switch OFF. 

2. Remove front blower motor relay. 

3. Check continuity between front blower motor relay terminals 3

and 5 when voltage is supplied between terminals 1 and 2. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace front blower motor relay.

Terminals

Voltage

Continuity

3

5

ON

Yes

OFF

No

JSIIA1551ZZ