2007 NISSAN TIIDA front

INTAKE DOOR MOTOR
HAC-231
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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1. Turn ignition switch OFF.
2. Disconnect front air control harness connector.
3. Disconnect intake door motor harness connector.
4. Check continuity between front air control harness connector (A)
and intake door motor harness connector (B).
OK or NG
OK >> Replace front air control. Refer to XXXX
NG >> Repair harness or connector.
AB
Continuity
Connector Terminal Connector Terminal
Front air control:
M8531
Intake door motor:
M685
Ye s
32 6
SJIA0959E

HAC-232
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System DescriptionINFOID:0000000001547339
SYSTEM DESCRIPTION
Component Parts
Blower motor 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 Blower Motor 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
AWIIA0341GB

BLOWER MOTOR CONTROL SYSTEM
HAC-233
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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low speed is usual low speed (approx. 4.0V). During high sunload conditions, the front air control causes the
blower motor speed to increase (approx. 6.5V).
Blower Motor Speed Control Specification
Front Blower Motor Component Function CheckINFOID:0000000001547340
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Turn the blower control dial. Blower motor should operate.
2. Rotate the blower control dial clockwise, and continue checking blower speed and fan symbol until all
speeds are checked.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-202, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to HAC-201, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS.
Set in Self-diagnostic mode. Refer to HAC-213, "
Front Air Control Self-Diagnosis".
Are any self-diagnosis codes present?
YES >> Repair as necessary.
NO >> GO TO 5.
5. CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the ambient sensor circuit. Refer to HAC-244, "
Ambient Sensor Diagnosis
Procedure".
YES or NO
YES >> GO TO 6.
NO >> Repair as necessary.
6. CHECK IN-VEHICLE SENSOR CIRCUIT
Perform diagnostic procedure for the in-vehicle sensor circuit. Refer to HAC-247, "
In-Vehicle Sensor Diagno-
sis Procedure".
YES or NO
YES >> GO TO 7.
NO >> Repair as necessary.
AWIIA0297GB

HAC-234
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
BLOWER MOTOR CONTROL SYSTEM
7. CHECK SUNLOAD SENSOR CIRCUIT
Perform diagnostic procedure for the sunload sensor circuit. Refer to HAC-250, "
Sunload Sensor Diagnosis
Procedure".
YES or NO
YES >> GO TO 8.
NO >> Repair as necessary.
8. CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to HAC-253, "
Intake Sensor Diagnosis Pro-
cedure".
YES or NO
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-202, "
Operational Check".
Does another symptom exist?
YES >> Repair as necessary.
NO >> Replace front air control. Refer to XXXX.
Front Blower Motor Diagnosis ProcedureINFOID:0000000001547341
SYMPTOM: Front blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Front blower motor operation is malfunctioning.
1.CHECK POWER SUPPLY FOR FRONT BLOWER MOTOR
1. Disconnect front blower motor connector.
2. Turn ignition switch ON.
3. Rotate blower control dial to maximum speed.
4. Check voltage between front blower motor harness connector
M62 terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> Check power supply circuit and 15A fuses (Nos. 15 and 17), located in the fuse block.
 If fuses are OK, check harness for open circuit. Repair or replace if necessary.
 If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2.CHECK CIRCUIT POWER SUPPLY FOR VARIABLE BLOWER CONTROL
AWIIA0344GB
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Front blower mo-
tor: M621 Battery voltage
SJIA0794E

BLOWER MOTOR CONTROL SYSTEM
HAC-235
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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1. Turn ignition switch OFF.
2. Connect front blower motor connector.
3. Disconnect variable blower control connector.
4. Turn ignition switch ON.
5. Check voltage between variable blower control harness connec-
tors M91 (A) terminal 1, and M90 (B) terminal 6 and ground.
Is the inspection result normal
YES >> GO TO 3.
NO >>  Terminal 1 - Ground: Repair harness or connector.
 Terminal 6 - Ground: GO TO 5.
3.CHECK GROUND CIRCUIT FOR VARIABLE BLOWER CONTROL
1. Turn ignition switch OFF.
2. Check continuity between variable blower control harness con-
nector M91 terminal 2 and ground.
Is the inspection result normal
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK BLOWER MOTOR
1. Disconnect front blower motor connector.
2. Check continuity between front blower motor terminals.
Is the inspection result normal
YES >> GO TO 5.
NO >> Replace blower motor. Refer to XXXX.
5.CHECK CIRCUIT CONTINUITY BETWEEN FRONT BLOWER MOTOR AND VARIABLE BLOWER CON-
TROL
Check continuity between front blower motor harness connector
M62 (A) terminal 2 and variable blower control harness connector
M90 (B) terminal 6.
Is the inspection result normal
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Variable blower control: M911 Battery voltage
Variable blower control: M906 Ground Battery voltage
AWIIA0286ZZ
Connector Terminal
GroundContinuity
Variable blower control:
M912Yes
AWIIA0299ZZ
Terminals Continuity
12 Yes
SJIA0798E
AB
Continuity
Connector Terminal Connector Terminal
Front blower mo-
tor: M622Variable blower
control: M906Yes
AWIIA0302ZZ

HAC-236
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
BLOWER MOTOR CONTROL SYSTEM
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND VARIABLE BLOWER CONTROL
1. Disconnect front air control connector.
2. Check continuity between front air control harness connector
M85 (A) terminal 21 and variable blower control harness con-
nector M90 (B) terminal 4.
Is the inspection result normal
YES >> Replace variable blower control. Refer to XXXX
NO >> Repair harness or connector.
7.CHECK FOR FRONT AIR CONTROL OUTPUT 2
1. Reconnect the front blower motor and the variable blower con-
trol.
2. Turn ignition switch ON.
3. Check output signal between front air control harness connector
M85 terminal 21 and ground.
Is the inspection result normal
YES >> Replace front air control. Refer to XXXX.
NO >> Replace variable blower control. Refer to XXXX.
Front Blower Motor Component InspectionINFOID:0000000001547342
COMPONENT INSPECTION
Front Blower Motor
Confirm smooth rotation of the blower motor (1).
 Ensure that there are no foreign particles inside the A/C unit
assembly.
AB
Continuity
Connector Terminal Connector Terminal
Front air control:
M8521Variable blower
control: M904Yes
AWIIA0560ZZ
Te r m i n a l s
ConditionVo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground Front air
control:
M8521Blower
speed: 1st
SJIA0887E
ZJIA0863J
SJIA0735E

HAC-238
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
MAGNET CLUTCH
MAGNET CLUTCH
System DescriptionINFOID:0000000001547352
SYSTEM DESCRIPTION
Front air control controls compressor operation by intake air temperature and signal from ECM.
Low Temperature Protection Control
Front air control will turn compressor ON or OFF as determined by a signal detected by intake sensor.
When intake air temperatures are higher than 3.5°C (38°F), the com-
pressor turns ON. The compressor turns OFF when intake air tem-
peratures are lower than 2°C (36°F).
Magnet Clutch Component Function CheckINFOID:0000000001547353
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1. Turn ignition switch ON.
2. Press the A/C switch.
3. Turn mode control dial to vent mode ( ). Confirm that the compressor clutch engages (sound or visual
inspection). (Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.PERFORM COMPLETE OPERATIONAL CHECK
Perform a complete operational check and check for any symptoms. Refer to HAC-202, "
Operational Check".
Can a symptom be duplicated?
YES >> Refer to HAC-201, "How to Perform Trouble Diagnosis For Quick And Accurate Repair".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS.
Set in Self-diagnostic mode. Refer to HAC-213, "
Front Air Control Self-Diagnosis".
Are any self-diagnosis codes present?
YES >> Repair as necessary.
NO >> GO TO 5.
5. CHECK AMBIENT SENSOR CIRCUIT
Perform diagnostic procedure for the mode door motor. Refer to HAC-244, "
Ambient Sensor Diagnosis Proce-
dure".
YES or NO
YES >> GO TO 6.
NO >> Repair as necessary.
SJIA0802E

MAGNET CLUTCH
HAC-239
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
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6. CHECK INTAKE SENSOR CIRCUIT
Perform diagnostic procedure for the intake sensor circuit. Refer to HAC-253, "
Intake Sensor Diagnosis Pro-
cedure".
YES or NO
YES >> GO TO 7.
NO >> Repair as necessary.
7. RECHECK FOR SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to HAC-202, "
Operational Check".
Does another symptom exist?
YES >> Repair as necessary.
NO >> Replace front air control. Refer to XXXX.
Magnet Clutch Diagnosis ProcedureINFOID:0000000001547354
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.CHECK INTAKE SENSOR CIRCUIT
Refer to HAC-253, "
Intake Sensor Diagnosis Procedure".
Is the inspection result normal
YES >> GO TO 2.
NO >> Malfunctioning intake sensor: Refer to XX.
2.PERFORM AUTO ACTIVE TEST
Refer to XX.
Does the magnet clutch operate?
YES >>  WITH CONSULT-III
GO TO 6.
 WITHOUT CONSULT-III
GO TO 7.
NO >> GO TO 3.
3.CHECK POWER SUPPLY FOR MAGNET CLUTCH
AWIIA0342GB