2007 NISSAN TIIDA Service Repair Manual

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Page 3449 of 5883

NISSAN TIIDA 2007 Service Repair Manual 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".

Page 3450 of 5883

NISSAN TIIDA 2007 Service Repair Manual INTAKE DOOR MOTOR
HAC-117
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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NO >> Repair harness or connector.

Page 3451 of 5883

NISSAN TIIDA 2007 Service Repair Manual HAC-118
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DescriptionINFOID:0000000001547417
SYSTEM DESCRIPTION
Component Parts
Fa

HAC-118
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DescriptionINFOID: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

Page 3452 of 5883

NISSAN TIIDA 2007 Service Repair Manual BLOWER MOTOR CONTROL SYSTEM
HAC-119
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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low speed is usual low speed (approx. 4.0V). During high sunload condition

Page 3453 of 5883

NISSAN TIIDA 2007 Service Repair Manual HAC-120
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
YES >> GO TO 7.
NO >> Repair as necessary.
7. CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for

Page 3454 of 5883

NISSAN TIIDA 2007 Service Repair Manual BLOWER MOTOR CONTROL SYSTEM
HAC-121
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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1. Turn ignition switch OFF.
2. Connect front blower motor connector M62.

Page 3455 of 5883

NISSAN TIIDA 2007 Service Repair Manual HAC-122
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
BLOWER MOTOR CONTROL SYSTEM
3. Change the blower motor speed from Lo to Hi, and confirm the duty ratios between variable blower control

Page 3456 of 5883

NISSAN TIIDA 2007 Service Repair Manual BLOWER MOTOR CONTROL SYSTEM
HAC-123
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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1. Turn ignition switch OFF.
2. Disconnect front air control connector M50

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