Nissan Titan. Manual - part 380

 

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Nissan Titan. Manual - part 380

 

 

MODE DOOR MOTOR

HAC-25

< DTC/CIRCUIT 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

>> 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 7 and mode door motor harness connector

M142 (B) terminal 2.

2. Check continuity between front air control harness connector

M49 terminal 7 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 

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 7 and ground.

Connector

Terminal

—

Continuity

M49 (C)

3

Ground

No

M50 (A)

28

A

B

Continuity

Connector

Terminal

Connector

Terminal

M49

7

M142

2

Yes

AWIIA0371ZZ

Connector

Terminal

—

Continuity

M49

7

Ground

No

AWIIA0370ZZ

A

B

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5 Volts

AWIIA0813ZZ

HAC-26

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR MOTOR

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 mode door motor harness connector M142.

2. Check voltage between front air control harness connector M49

terminal 7 and ground.

Is the inspection result normal?

YES

>> Inspect mode door for binding or mechanical failure. If

mode door moves freely, replace front air control. Refer

to 

VTL-8, "Removal and Installation"

.

NO

>> Replace the mode door motor. Refer to 

VTL-19,

"Removal and Installation"

.

Connector

Terminal

—

Voltage (Approx.)

M49

7

Ground

0 Volts

AWIIA0369ZZ

Connector

Terminal

—

Voltage (Approx.)

M49

7

Ground

0.2 to 4.8 Volts

AWIIA0369ZZ

AIR MIX DOOR MOTOR

HAC-27

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AIR MIX DOOR MOTOR

System Description

INFOID:0000000009882451

SYSTEM DESCRIPTION

SYMPTOM:

• Discharge air temperature does not change.

• Air mix door motor does not operate.

SYSTEM DESCRIPTION

Component Parts

Air mix door control system components are:

• Front air control

• Air mix door motors (driver, passenger)

• PBR (built-into air mix door motors)

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

The front air control receives data from the temperature selected by the driver side, passenger side, and rear.

The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is

applied to the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is

determined by which circuit has voltage applied to it, and which one has ground applied to it. The front air con-

trol monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.

In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the front air control which

determines the proper position based on inputs from the in-vehicle sensor, ambient sensor, optical sensor,

intake sensor, and the temperature selected by the driver and front and rear passengers.

Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new

door position data is returned to the front air control

AWIIA0372GB

HAC-28

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR MOTOR

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors

The driver (1) and passenger (2) air mix door motors are attached to

the front heater & cooling unit assembly. These motors rotate so that

the air mix door is opened or closed to a position set by the front air

control. Motor rotation is then conveyed through a shaft and the air

mix door position is then fed back to the front air control by the PBR

built into the air mix door motors.

Air Mix Door Motor (Driver) Component Function Check

INFOID:0000000009882452

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial (driver) 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 (driver) 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-28, "Air Mix Door Motor (Driver) Diagnosis Procedure"

.

Air Mix Door Motor (Driver) Diagnosis Procedure

INFOID:0000000009882453

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.

1.

CHECK AIR MIX DOOR MOTOR (DRIVER) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLT-

AGE
1. Turn ignition switch ON.

WJIA0435E

AWIIA0109ZZ

 

 

 

 

 

 

 

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