Nissan Altima L32. Manual - part 817

HAC-42

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

NO

>> Repair as necessary.

7.

 CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to 

HAC-53, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Repair as necessary.

8.

 CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to 

HAC-56, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 9

NO

>> Repair as necessary.

9.

 CHECK INTAKE SENSOR CIRCUIT

Perform diagnostic procedure for the intake sensor circuit. Refer to 

HAC-59, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 10

NO

>> Repair as necessary.

10.

 RECHECK FOR SYMPTOMS 

Perform a complete operational check and check for any symptoms. Refer to 

HAC-5, "Description and Condi-

tions"

.

Does another symptom exist?

YES

>> Repair as necessary.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

Diagnosis Procedure

INFOID:0000000004498211

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSIS PROCEDURE FOR BLOWER MOTOR

SYMPTOM: Blower motor operation is malfunctioning under starting

blower speed control.

1.

CHECK POWER SUPPLY FOR BLOWER MOTOR

1. Disconnect fuse block (J/B) connector.

2. Press ignition switch ON.

3. Check voltage between fuse block (J/B) harness connector E6

terminal P6 and ground.

Is the inspection result normal?

YES

>> GO TO 2

AWIIA0045GB

Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

E6 - 6P

Body ground

12V

AWIIA0614ZZ

BLOWER MOTOR

HAC-43

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Check power supply circuit and 15A fuses [Nos. 21 and 22, located in the fuse block (J/B)].

• If OK, check for open circuit in wiring harness.

Repair or replace as necessary.

• If OK, check fuses and check wiring harness for possible open or short circuit.

• If OK, GO TO 5

2.

CHECK BODY GROUND CIRCUIT FOR BLOWER MOTOR

1. Disconnect blower motor connector.

2. Press ignition switch OFF.

3. Check continuity between blower motor harness connector M31

terminal 1 and ground.

Is the inspection result normal?

YES

>> Reconnect blower motor harness connector and GO TO

3

NO

>> Repair harness or connector.

3.

CHECK BLOWER MOTOR CONTROL CIRCUIT BETWEEN BLOWER MOTOR AND FRONT AIR CON-

TROL

1. Disconnect front air control harness connector.

2. Check continuity between blower motor harness connector M31

(A) terminal 3 and front air control harness connector M37 (B)

terminal 1.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair harness or connector.

4.

CHECK POWER SUPPLY FOR FRONT AIR CONTROL

1. Press ignition switch ON.

2. Check voltage between front air control harness connector M37

terminals 39, 19, 40 and ground.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

2. Confirm that blower motor operation is normal.

NO

>> • Check for open circuit in wiring harness.

Repair or replace as necessary.

• If OK, replace fuse and check wiring harness for short circuit.

Repair or replace an necessary.

5.

CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR RELAY

Terminal

Continuity

Connector - Terminal

Body ground

Yes

M31-1

AWIIA0611ZZ

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M31-3

M37-1

AWIIA0612ZZ

Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

12V

M37-39

M37-19

M37-40

AWIIA0613ZZ

HAC-44

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR

1. Connect fuse block (J/B) connector.

2. Press ignition switch ON.

3. Turn blower motor control dial to any speed except OFF.

4. Check voltage between fuse block (J/B) E6 terminal 6P and

ground.

Is the inspection result normal?

YES

>> GO TO 9

NO

>> GO TO 6

6.

CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR RELAY FOR AN OPEN

1. Press ignition switch OFF.

2. Disconnect BCM harness connector M19.

3. Disconnect fuse block (J/B) connector.

4. Check continuity between BCM harness connector M19 (A) ter-

minal 90 and fuse block (J/B) harness connector E6 (B) terminal

6P.

Is the inspection result normal?

YES

>> GO TO 7

NO

>> Repair harness or connector.

7.

CHECK BLOWER FAN SWITCH SIGNAL FOR VOLTAGE

1. Disconnect BCM harness connector M18.

2. Press ignition switch ON.

3. Check voltage between BCM harness connector M18 terminal

55 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-96, "Removal and Installa-

tion"

.

NO

>> GO TO 8

8.

CHECK BLOWER FAN SWITCH SIGNAL CIRCUIT FOR AN OPEN

1. Press ignition switch OFF.

2. Disconnect front air control harness connector.

3. Check continuity between BCM harness connector M18 (A) ter-

minal 55 and front air control harness connector M37 (B) termi-

nal 24.

6P - Ground

: Battery Voltage

AWIIA0615ZZ

Terminal

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

Yes

M19-90

E6 - 6P

AWIIA0616ZZ

Terminal

Voltage (V)

(Approx.)

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

M18-55

Ground

12V

AWIIA0617ZZ

Terminal

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

Yes

M18 - 55

M37 - 24

AWIIA0618ZZ

BLOWER MOTOR

HAC-45

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

NO

>> Repair harness or connector.

9.

CHECK FRONT BLOWER MOTOR RELAY GROUND

1. Press ignition switch OFF.

2. Disconnect fuse block (J/B) harness connector M5.

3. Check continuity between fuse block (J/B) harness connector

M5 terminal 7M and ground.

Is the inspection result normal?

YES

>> Replace front blower motor relay.

NO

>> Repair harness or connector.

Terminal

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

Yes

M5 - 7M

Ground

AWIIA0619ZZ