Nissan Titan. Manual - part 405

INTAKE DOOR MOTOR

HAC-125

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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INTAKE DOOR MOTOR

System Description

INFOID:0000000009882522

SYSTEM DESCRIPTION

SYMPTOM:

• Intake door motor does not operate normally.

• Intake door does not change.

SYSTEM DESCRIPTION

Component Parts

Intake door control system components are:

• Front air control

• Intake door motor (PRB built into the intake door motor)

• Ambient sensor

• Intake sensor

System Operation

The intake door control determines the intake door position based on the position of the recirculation switch.

When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and

recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the

opposite direction, again allowing fresh air into the cabin.

Intake Door Control Specification

COMPONENT DESCRIPTION

Intake door motor

The intake door motor is attached to the intake unit. It rotates so that

air is drawn from inlets set by the front air control. Motor rotation is

conveyed to a lever which activates the intake door.

Intake Door Motor Component Function Check

INFOID:0000000009882523

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (

)

1. Press the vent mode switch (

).

2. Press REC (

) switch. The REC (

)indicator should illuminate.

3. Press REC (

) switch again. The REC (

) indicator should go out.

4. Listen for intake door position change (you should hear blower sound change slightly).

WJIA0436E

WJIA0552E

HAC-126

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

INTAKE DOOR MOTOR

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-126, "Intake Door Motor Diagnosis Procedure"

.

Intake Door Motor Diagnosis Procedure

INFOID:0000000009882524

Regarding Wiring Diagram information, refer to 

HAC-155, "Wiring Diagram - Manual With 2 Control Dial Sys-

tem"

.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

SYMPTOM:

• Intake door does not change.

• Intake door motor does not operate normally.

1.

CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M180 (A) and

the intake door motor harness connector M58 (B).

3. Check continuity between front air control harness connector

M180 (A) terminals 21, 22 and the intake door motor harness

connector M58 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M180 terminals 21, 22 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

2.

CHECK FRONT AIR CONTROL FOR INTAKE AIR DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector

M180 terminal 21 and terminal 22 while placing the HVAC sys-

tem into self-diagnostic mode.

Is the inspection result normal?

YES

>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the

intake air door motor. Refer to 

VTL-18, "Removal and Installation"

.

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M180

21

M58

6

Yes

22

1

Connector

Terminal

—

Continuity

M180

21

Ground

No

22

AWIIA0401ZZ

AWIIA0398ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M180

21

22

Self-diagnostic mode (opening)

Battery voltage

22

21

Self-diagnostic mode (closing)

Battery voltage

AWIIA0397ZZ

DEFROSTER DOOR MOTOR CIRCUIT

HAC-127

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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DEFROSTER DOOR MOTOR CIRCUIT

System Description

INFOID:0000000009882525

SYSTEM DESCRIPTION

Component Parts

Defroster door control system components are:

• Front air control

• Defroster door motor

• Position balanced resistor (PBR) (Built into defroster door motor)

• Ambient sensor

• Intake sensor

System Operation

The front air control determines defroster door position based on the position of the defroster switch. When the

defroster switch is depressed, the defroster door motor rotates directing air to the defroster ducts. When any

mode other than defroster is selected, the defroster motor rotates in the opposite direction closing off air flow

to the defroster ducts.

COMPONENT DESCRIPTION

Defroster door motor 

The defroster door motor is attached to the front heater & cooling

unit assembly. The front air control sends a voltage to rotate to the

defroster door directing the air flow either to the defroster ducts, or to

the floor ducts, depending on which way the voltage and ground are

applied to the motor leads. Motor rotation is conveyed to a lever

which activates the defroster door.

Defroster Door Motor Component Function Check

INFOID:0000000009882526

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DEFROSTER DOOR

1. Select vent (

) mode.

2. Press the defrost switch (

). Defroster indicator should illuminate. 

3. Listen for defroster door position change (blower sound should change slightly).
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-127, "Defroster Door Motor Diagnosis Procedure"

Defroster Door Motor Diagnosis Procedure

INFOID:0000000009882527

Regarding Wiring Diagram information, refer to 

HAC-155, "Wiring Diagram - Manual With 2 Control Dial Sys-

tem"

.

SYMPTOM:

• Defroster door does not change.

• Defroster door motor does not operate normally.

WJIA0592E

HAC-128

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

DEFROSTER DOOR MOTOR CIRCUIT

1.

CHECK DEFROSTER DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE

1. Turn ignition switch ON.

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

HAC-111, "CON-

SULT Function (HVAC)"

.

3. Observe "DEF FDBCK" voltage while cycling front air control mode switch through all modes and pressing

DEF switch.

Is the inspection result normal?

YES

>> • Defroster door motor is OK.

• Inspect defroster door for mechanical failure. Refer to 

VTL-17, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK DEFROSTER DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the front air control harness connector M180 (A) and

the defroster door motor harness connector M144 (B).

3. Check continuity between front air control harness connector

M180 (A) terminals 23, 24 and the defroster door motor harness

connector M144 (B) terminals 1, 6.

4. Check continuity between front air control harness connector

M180 terminals 23, 24 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

CHECK FRONT AIR CONTROL FOR DEFROSTER DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.
3. Press the mode switch to the VENT (

) mode. 

4. Check voltage between front air control harness connector

M180 terminal 23 and terminal 24 while pressing the defroster
switch (

). 

Is the inspection result normal?

YES

>> GO TO 4.

Monitor Item

Condition

Results

DEF FDBCK

Cycle mode switch through all modes, D/F 

(

), VENT (

), B/L (

), FOOT(

), and 

press DEF (

)

Voltage varies between 0.2 and 4.8 volts.

A

B

Continuity

Connector

Terminal

Connector

Terminal

M180

23

M144

1

Yes

24

6

Connector

Terminal

—

Continuity

M180

23

Ground

No

24

AWIIA0406ZZ

AWIIA0403ZZ

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M180

23

24

Following defroster switch (

) on

Battery voltage

24

23

Following defroster switch (

) off

Battery voltage

AWIIA0404ZZ