Nissan Titan. Manual - part 403

MODE DOOR MOTOR

HAC-117

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

• Mode door motor does not operate normally.

1.

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

1. Turn ignition switch ON.

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

HAC-111,

"CONSULT Function (HVAC)"

.

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

Is the inspection result normal?

YES

>> • Mode door motor is OK.

• Inspect mode door for mechanical failure. Refer to 

VTL-19, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK MODE 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 mode door motor harness connector M142 (B).

3. Check continuity between front air control harness connector

M180 (A) terminals 19, 20 and the mode door motor harness

connector M142 (B) terminals 5, 6.

4. Check continuity between front air control harness connector

M180 terminals 19, 20 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness as necessary.

3.

CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND 

1. Reconnect front air control harness connector.

2. Turn ignition switch ON.
3. Press the mode switch to the D/F (

) mode. 

4. Check voltage between front air control harness connector

M180 terminal 19 and terminal 20 while pressing the mode
switch to the VENT (

), and then the B/L (

) mode. 

Is the inspection result normal?

YES

>> GO TO 4.

Monitor Item

Condition

Results

MODE FDBCK

Cycle mode switch through all modes, D/F 

(

), VENT (

), B/L (

), and FOOT(

)

Voltage varies between D/F (

) and VENT (

), and 

between VENT (

) and B/L (

).

A

B

Continuity

Connector

Terminal

Connector

Terminal

M180

19

M142

5

Yes

20

6

Connector

Terminal

—

Continuity

M180

19

Ground

No

20

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Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M180

19

20

D/F (

) mode to VENT (

) mode

Battery voltage

20

19

VENT (

) mode to B/L (

) mode

Battery voltage

AWIIA0360ZZ

HAC-118

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

MODE DOOR MOTOR

NO

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

4.

CHECK MODE DOOR MOTOR 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

M180 (C) terminal 3, and M181 (A) terminal 28 and the mode

door motor harness connector M142 (B) terminals 1, 3.

4. Check continuity between front air control harness connector

M180 (C) terminal 3, M181 (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

M180 (A) terminal 7 and mode door motor harness connector

M142 (B) terminal 2.

2. Check continuity between front air control harness connector

M180 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 

A and C

B

Continuity

Connector

Terminal

Connector

Terminal

M180 (C)

3

M142

3

Yes

M181 (A)

28

1

Connector

Terminal

—

Continuity

M180 (C)

3

Ground

No

M181 (A)

28

AWIIA0368ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

M180

7

M142

2

Yes

AWIIA0371ZZ

Connector

Terminal

—

Continuity

M180

7

Ground

No

AWIIA0370ZZ

MODE DOOR MOTOR

HAC-119

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

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F

G

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A

B

HAC

N

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1. Reconnect front air control harness connectors.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector

M180   (B) terminal 3, and M181 (A) terminal 28.

4. Check voltage between front air control harness connector

M180 terminal 7 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 mode door motor harness connector M142.

2. Check voltage between front air control harness connector

M180 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"

.

A

B

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M181

28

M180

3

5 Volts

Connector

Terminal

—

Voltage (Approx.)

M180

7

Ground

0 Volts

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Connector

Terminal

—

Voltage (Approx.)

M180

7

Ground

0.2 to 4.8 Volts

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HAC-120

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

AIR MIX DOOR MOTOR

AIR MIX DOOR MOTOR

System Description

INFOID:0000000009882519

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 motor

• Position balanced resistor (PBR) (built-into air mix door motors)

• 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.

Air Mix Door Control Specification

COMPONENT DESCRIPTION

Air Mix Door Motors

The air mix door motor (1) is attached to the front heater & cooling

unit assembly. The motor rotates 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

motor.

Air Mix Door Motor Component Function Check

INFOID:0000000009882520

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1. Turn the temperature control dial clockwise to maximum hot.

2. Check for hot air at discharge air outlets.

WJIA0435E

AWIIA1391ZZ