Nissan Altima L32. Manual - part 838

HAC-126

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

BLOWER MOTOR

BLOWER MOTOR

Description

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SYSTEM DESCRIPTION

Component Parts

Fan speed control system components are:

• Front air control

• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)

System Operation

Component Function Check

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INSPECTION FLOW

1.

 CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - FRONT BLOWER

1. Rotate the blower control dial clockwise. Blower should operate. 

2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are

checked.

Can a symptom be duplicated?

YES

>> GO TO 3.

 NO

>> GO TO 2.

2.

 PERFORM COMPLETE OPERATIONAL CHECK

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

HAC-155,

"Symptom Matrix Chart"

.

Is the inspection result normal?

YES

>> Refer to 

HAC-155, "Symptom Matrix Chart"

.

NO

>> System OK. 

3.

 CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

 CHECK BLOWER MOTOR OPERATION 

Check and verify blower motor operates in all speeds. 
Does blower motor operate in all speeds?

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BLOWER MOTOR

HAC-127

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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YES

>> GO TO 5.

NO

>> Refer to 

HAC-127, "Diagnosis Procedure"

.

5.

 RECHECK FOR SYMPTOMS 

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

HAC-155,

"Symptom Matrix Chart"

.

Does another symptom exist?

YES

>> Repair as necessary.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

Diagnosis Procedure

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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.

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

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Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

E6 - 6P

Body ground

12V

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HAC-128

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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, 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

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Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M31-3

M37-1

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Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

12V

M37-39

M37-40

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BLOWER MOTOR

HAC-129

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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. 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. Press ignition switch ON.

2. Disconnect BCM harness connector M18.

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 Installation"

.

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.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

6P - Ground

: Battery Voltage

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Terminal

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

Yes

M19-90

E6 - 6P

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Terminal

Voltage (V)

(Approx.)

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

12V

M18-55

Ground

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Terminal

Continuity 

(+)

(-)

Connector - Terminal

Connector - Terminal

Yes

M18 - 55

M37 - 24

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