Nissan Pathfinder. Manual - part 720

REAR BLOWER MOTOR

HAC-141

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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5.

CHECK REAR BLOWER MOTOR RESISTOR 2 GROUND CIRCUIT

1. Disconnect rear blower motor resistor 2 connector.

2. Check continuity between rear blower motor resistor 2 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK BLOWER MOTOR FEEDBACK SIGNAL

1. Reconnect rear blower motor resistor 2 connector.

2. Turn ignition switch ON.

3. Turn fan control to 1st speed.

4. Check voltage between auto amp. harness connector and ground.

Is the inspection result normal?

YES

>> Replace auto amp.

NO

>> Repair harness or connector.

7.

CHECK POWER VOLTAGE OF BLOWER RELAY

1. Turn ignition switch OFF.

2. Remove blower relay.

3. Turn ignition switch ON.

4. Check voltage between rear blower relay connector terminals and ground.

Is the inspection result normal

YES

>> Check rear blower motor relay. Refer to 

HAC-142, "Component Inspection (Rear Blower Motor

Relay)"

.

NO

>> Repair harness or connector.

8.

CHECK CIRCUIT CONTINUITY BETWEEN BLOWER MOTOR AND REAR BLOWER MOTOR RESISTOR

2

1. Turn ignition switch OFF.

2. Disconnect rear blower motor resistor 2 connector.

3. Check continuity between blower motor harness connector and rear blower motor resistor 2 harness con-

nector.

Rear blower motor resistor 2

—

Continuity

Connector

Terminal

B133

3

Ground

Yes

(+)

(

−)

Condition

Voltage

(Approx.)

Auto amp.

Connector

Terminal

M50

32

Ground

Blower speed: 1st

(Blower motor operating)

10 V

(+)

(

−)

Voltage

(Approx.)

Rear blower relay

Connector

Terminal

M108

1

Ground

Battery voltage

3

6

HAC-142

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

REAR BLOWER MOTOR

Is the inspection result normal?

YES

>> Replace blower motor.

NO

>> Repair harness or connector.

9.

CHECK REAR BLOWER MOTOR RESISTOR 2

Check rear blower motor resistor 2. Refer to 

HAC-142, "Component Inspection (Rear Blower Motor Resistor)"

.

Is the inspection result normal?

YES

>> Replace auto amp.

NO

>> Replace rear blower motor resistor 2.

Component Inspection (Rear Blower Motor)

INFOID:0000000009176878

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 (Rear Blower Motor Relay)

INFOID:0000000009176879

1.

CHECK REAR BLOWER RELAY

1. Remove rear blower relay. Refer to 

PG-82, "Terminal Arrangement"

.

2. Check continuity between rear blower relay terminals 3 and 5,

then 6 and 7 when voltage is supplied between terminals 1 and

2. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace rear blower relay.

Component Inspection (Rear Blower Motor Resistor)

INFOID:0000000009176880

1.

CHECK FAN CONTROL AMP.

1. Turn ignition switch OFF.

2. Remove rear blower motor resistor. Refer to 

HAC-167, "Removal and Installation - Rear Blower Motor

Resistor 1"

 or 

HAC-167, "Removal and Installation - Rear Blower Motor Resistor 2"

.

3. Check continuity between the rear blower motor resistor terminals using analog circuit tester.

Blower motor

Rear blower motor resistor 2

Continuity

Connector

Terminal

Connector

Terminal

B134

2

B133

1

Yes

Terminal

Voltage

Continuity

3

5

ON

Yes

OFF

No

6

7

ON

Yes

OFF

No

JMIIA1869ZZ

Terminal

Continuity

(+)

(

−)

3

2

Yes

2

3

No

REAR BLOWER MOTOR

HAC-143

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

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HAC

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P

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace rear blower motor resistor. Refer to 

HAC-167, "Removal and Installation - Rear Blower

Motor Resistor 1"

 or 

HAC-167, "Removal and Installation - Rear Blower Motor Resistor 2"

.

HAC-144

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

SYMPTOM DIAGNOSIS

FRONT AUTOMATIC AIR CONDITIONING SYSTEM

Diagnosis Chart By Symptom

INFOID:0000000009176881

NOTE:

Perform the self-diagnoses with CONSULT before performing the symptom diagnosis. If DTC is detected, per-

form the corresponding diagnosis.

Symptom

Corresponding malfunction part

Reference

• Front air conditioning does not activate.
• Front air conditioning cannot be controlled.
• Operation status of air conditioning is not indicated 

on display.

• A/C auto amp. ignition power supply 

circuit

• Front A/C control (A/C auto amp.)

HAC-112, "A/C AUTO AMP. : Diag-
nosis Procedure"

• Air outlet does not change.
• Mode door motor (front) does not operate normal-

ly.

• Circuit between mode door motor 

(front) and A/C auto amp. 

• Mode door motor (front) control link-

age

• Mode door motor (front)
• A/C auto amp.

HAC-115, "MODE DOOR MOTOR 
(FRONT) : Diagnosis Procedure"

• Discharge air temperature of driver side does not 

change.

• Air mix door motor (driver side) does not operate 

normally.

• Circuit between air mix door motor 

(driver side) and A/C auto amp. 

• Air mix door motor (driver side) in-

stallation condition

• Air mix door motor (driver side)
• A/C auto amp.

HAC-112, "AIR MIX DOOR MO-
TOR (DRIVER SIDE) : Diagnosis 
Procedure"

• Discharge air temperature of passenger side does 

not change.

• Air mix door motor (passenger side) does not op-

erate normally.

• Circuit between air mix door motor 

(passenger side) and A/C auto amp. 

• Air mix door motor (passenger side) 

installation condition

• Air mix door motor (passenger side)
• A/C auto amp.

HAC-113, "AIR MIX DOOR MO-
TOR (PASSENGER SIDE) : Diag-
nosis Procedure"

• Intake door does not change.
• Intake door motor does not operate normally.

• Circuit between intake door motor 

and A/C auto amp. 

• Intake door motor control linkage
• Intake door motor
• A/C auto amp.

HAC-117, "INTAKE DOOR MOTOR 
: Diagnosis Procedure"

All door motors do not operate normally.

• Each door motor power supply and 

ground circuit

• A/C auto amp.

HAC-126, "Diagnosis Procedure"

Front blower motor operation is malfunctioning.

• Power supply system of front blower 

motor

• Circuit between front blower motor 

and A/C auto amp.

• Front blower motor
• A/C auto amp.

HAC-130, "Diagnosis Procedure"

Compressor does not operate.

• Circuit between magnet clutch and 

IPDM E/R

• Magnet clutch
• IPDM E/R (A/C relay)
• Circuit between ECM and refriger-

ant pressure sensor

• Refrigerant pressure sensor
• CAN communication circuit
• A/C auto amp.

HAC-133, "Diagnosis Procedure"