Nissan Titan. Manual - part 381

AIR MIX DOOR MOTOR

HAC-29

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

2. Using CONSULT, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-17,

"CONSULT Function (HVAC)"

.

3. Observe "DVR MIX FDBACK" voltage while rotating temperature control dial (driver) between 32

°C (90°F)

and 18

°C (60°F).

Is the inspection result normal?

YES

>> • Air mix door motor (driver) is OK.

• Inspect air mix door (driver) for mechanical failure and repair if necessary. If air mix door (driver)

is OK, refer to 

HAC-83, "Component Function Check"

 for insufficient cooling or 

HAC-91, "Com-

ponent Function Check"

 for insufficient heating.

NO

>> GO TO 2.

2.

CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M49 (A) and

the air mix door motor (driver) harness connector M147 (B).

3. Check continuity between front air control harness connector

M49 (A) terminals 17, 18 and the air mix door motor (driver) har-

ness connector M147 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M49 terminals 17, 18 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR (DRIVER) POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.

3. Rotate temperature control dial (driver) to 32

°C (90°F).

4. Check voltage between front air control harness connector M49

terminal 17 and terminal 18 while rotating temperature control

dial (driver) to 18

°C (60°F) and back to 32°C (90°F).

Is the inspection result normal?

Monitor Item

Condition

Results

DVR MIX FDBCK

Rotate temperature control dial (driver) be-

tween 32

°C (90°F) and 18°C (60°F)

Voltage varies with dial rotation between 0.2 and 4.8 

volts.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M49

17

M147

1

Yes

18

6

Connector

Terminal

—

Continuity

M49

17

Ground

No

18

AWIIA0377ZZ

AWIIA0374ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M49

17

18

While rotating temperature control 

dial (driver) from 32

°C (90°F) to 18°C 

(60

°F)

Battery voltage

18

17

While rotating temperature control 

dial (driver) from 18

°C (60°F) to 32°C 

(90

°F)

Battery voltage

AWIIA0373ZZ

HAC-30

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

YES

>> GO TO 4.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

4.

CHECK AIR MIX DOOR MOTOR (DRIVER) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connectors.

3. Check continuity between front air control harness connector

M49 (C) terminal 3, connector M50 (A) terminal 28 and air mix

door motor (driver) harness connector M147 (B) terminals 3, 2.

4. Check continuity between front air control harness connector

M49 (C) terminal 3, M50 (A) terminal 28 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness as necessary.

5.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between front air control harness connector

M49 (A) terminal 6 and air mix door motor (driver) harness con-

nector M147 (B) terminal 4.

2. Check continuity between front air control harness connector

M49 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness as necessary.

6.

CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK

SIGNAL 

A and C

B

Continuity

Connector

Terminal

Connector

Terminal

M49 (C)

3

M147

2

Yes

M50 (A)

28

3

Connector

Terminal

—

Continuity

M49 (C)

3

Ground

No

M50 (A)

28

AWIIA0393ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

M49

6

M147

4

Yes

AWIIA0384ZZ

Connector

Terminal

—

Continuity

M49

6

Ground

No

AWIIA0383ZZ

AIR MIX DOOR MOTOR

HAC-31

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Reconnect front air control harness connectors.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector M49

(B) terminal 3, and M50 (A) terminal 28.

4. Check voltage between front air control harness connector M49

terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and

Installation"

.

7.

CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor (driver) harness connector

M147.

2. Check voltage between front air control harness connector M49

terminal 6 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door (driver) for binding or mechanical

failure. If air mix door (driver) moves freely, replace front

air control. Refer to 

VTL-8, "Removal and Installation"

.

NO

>> Replace air mix door motor (driver). Refer to 

VTL-20, "Removal and Installation"

.

Air Mix Door Motor (Passenger) Component Function Check

INFOID:0000000009882454

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial (passenger) clockwise until 32

°C (90°F) is displayed.

2. Check for hot air at discharge air outlets.

>> GO TO 2.

2.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1. Turn the temperature control dial (passenger) counterclockwise until 18

°C (60°F) is displayed.

2. Check for cold air at discharge air outlets.
Can a symptom be duplicated?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-32, "Air Mix Door Motor (Passenger) Diagnosis Proce-

dure"

.

A

B

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5 Volts

AWIIA0813ZZ

Connector

Terminal

—

Voltage (Approx.)

M49

6

Ground

0 Volts

AWIIA0382ZZ

Connector

Terminal

—

Voltage (Approx.)

M49

6

Ground

0.2 to 4.8 Volts

AWIIA0382ZZ

HAC-32

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

Air Mix Door Motor (Passenger) Diagnosis Procedure

INFOID:0000000009882455

Regarding Wiring Diagram information, refer to 

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

.

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (PASSENGER)

1.

CHECK AIR MIX DOOR MOTOR (PASSENGER) POSITION BALANCED RESISTOR (PBR) FEEDBACK

VOLTAGE
1. Turn ignition switch ON.

2. Using CONSULT, check "PAS MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to 

HAC-17,

"CONSULT Function (HVAC)"

.

3. Observe "PAS MIX FDBCK" voltage while rotating temperature control dial (passenger) between 32

°C

(90

°F) and 18°C (60°F).

Is the inspection result normal?

YES

>> • Air mix door motor (passenger) is OK.

• Inspect air mix door (passenger) for mechanical failure and repair if necessary. If air mix door

(passenger) is OK, refer to 

HAC-83, "Component Function Check"

 for insufficient cooling or

HAC-91, "Component Function Check"

 for insufficient heating.

NO

>> GO TO 2.

2.

CHECK AIR MIX DOOR MOTOR (PASSENGER) CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M49 (A) and

the air mix door motor (passenger) harness connector M143 (B).

3. Check continuity between front air control harness connector

M49 (A) terminals 2, 14 and the air mix door motor (passenger)

harness connector M143 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M49 terminals 2, 14 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR (PASSENGER) POWER AND GROUND 

Monitor Item

Condition

Results

PAS MIX FDBCK

Rotate temperature control dial (passenger) be-

tween 32

°C (90°F) and 18°C (60°F)

Voltage varies between 0.2 and 4.8 volts.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M49

14

M143

1

Yes

2

6

Connector

Terminal

—

Continuity

M49

14

Ground

No

2

AWIIA0389ZZ

AWIIA0386ZZ