Nissan Tiida C11. Manual - part 863

HAC-116

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

INTAKE DOOR MOTOR

Perform diagnostic procedure for the intake sensor circuit. Refer to 

HAC-139, "Intake Sensor Diagnosis Pro-

cedure"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair as necessary.

8.

 CHECK AIR MIX DOOR MOTOR PBR CIRCUIT

Perform diagnostic procedure for the air mix door motor PBR circuit. Refer to 

HAC-112, "Air Mix Door Motor

Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair as necessary.

9.

 RECHECK FOR SYMPTOMS 

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

HAC-87, "Operational Check"

.

Does another symptom exist?

YES

>> Repair as necessary.

NO

>> Replace front air control. Refer to .

Intake Door Motor Diagnosis Procedure

INFOID:0000000001547413

SYMPTOM:

• Intake door does not change.
• Intake door motor does not operate normally.

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR

1.

CHECK POWER SUPPLY FOR INTAKE DOOR MOTOR 

1.

Turn ignition switch ON.

2.

Check voltage between intake door motor harness connector
M89 terminal 5, 6 and 6, 5.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to XX.

NO

>> GO TO 2.

2.

CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND INTAKE DOOR MOTOR 

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector M51.

3.

Disconnect intake door motor connector M89.

4.

Check continuity between front air control harness connector
M51 (A) terminal 27, 36 and intake door motor harness connec-
tor M89 (B) terminal 5, 6.

Is the inspection result normal?

YES

>> Replace front air control. Refer to XX.

Terminals

Condition

Voltage

(Approx.)

Connector

Terminal 

 (+)

 (

−

)

Intake door motor: M89

5 6 

FRE 

→

 REC

12 V

6 5 

REC 

→

 FRE

SJIA0957E

A

B

Continuity

Connector

Terminal

Connector

Terminal

Front air control: 

M51

27

Intake door motor: 
M89

5

Yes

36

6

SJIA0955E

INTAKE DOOR MOTOR

HAC-117

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Repair harness or connector.

HAC-118

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

BLOWER MOTOR CONTROL SYSTEM

BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000001547417

SYSTEM DESCRIPTION

Component Parts

Fan speed control system components are:

• Front air control
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
• Intake sensor

System Operation

Automatic Mode

In the automatic mode, the blower motor speed is calculated by the front air control based on input from in-
vehicle sensor, sunload sensor, intake sensor and ambient sensor.
The blower motor is applied voltage ranges from approximately 3.0 volts (lowest speed) to 12 volts (highest
speed).
The control blower speed (in the range of 3.0 to 12V), front air control supplies a gate voltage to the power
transistor. Based on this voltage, front air control controls voltage supplied to the blower motor.

Starting Fan Speed Control

Start up from COLD SOAK Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 56

°

C, the blower will not operate for

a short period of time (up to 150 seconds). The exact start delay time varies depending on the ambient and
engine coolant temperature.
In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
56

°

C, at which time the blower speed will increase to the objective speed.

Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the A/C switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).

Blower Speed Compensation

Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower

AWIIA0296GB

BLOWER MOTOR CONTROL SYSTEM

HAC-119

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

low speed is usual low speed (approx. 4.0V). During high sunload conditions, front air control causes the
blower speed to increase (approx. 6.5V).

Fan Speed Control Specification

Front Blower Motor Component Function Check

INFOID:0000000001569475

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1.

Press blower motor switch UP. Blower motor should operate on low speed. The fan indicator should have
one blade illuminated.

2.

Press blower motor switch UP, and continue checking blower motor speed and fan indicator until all
speeds are checked.

Can the symptom be duplicated?

YES

>> GO TO 2.

NO

>> Perform a complete operational check. Refer to 

HAC-87, "Operational Check"

.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS.

Perform the self-diagnostic function. Refer to 

HAC-98, "Front Air Control Self-Diagnosis"

.

Are any self-diagnosis codes present?

YES

>> Repair as necessary.

NO

>> GO TO 4.

4.

 CHECK AMBIENT SENSOR CIRCUIT

Perform diagnostic procedure for the ambient sensor circuit. Refer to 

HAC-130, "Ambient Sensor Diagnosis

Procedure"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair as necessary.

5.

 CHECK IN-VEHICLE SENSOR CIRCUIT

Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to 

HAC-133, "In-Vehicle Sensor Diagno-

sis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair as necessary.

6.

 CHECK SUNLOAD SENSOR CIRCUIT

Perform diagnostic procedure for the sunload sensor circuit. Refer to 

HAC-136, "Sunload Sensor Diagnosis

Procedure"

.

Is the inspection result normal?

AWIIA0297GB