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
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
MA
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 CheckINFOID: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

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 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. 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 .
Front Blower Motor Diagnosis ProcedureINFOID:0000000001547419
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 M62.
2. Turn ignition switch ON.
3. 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 (J/B)].
 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
AWIIA0298GB
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
Front blower motor:
M621 Battery voltage
SJIA0794E

BLOWER MOTOR CONTROL SYSTEM
HAC-121
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Connect front blower motor connector M62.
3. Disconnect variable blower control connectors M90, M91.
4. Turn ignition switch ON.
5. Check voltage between variable blower control harness connec-
tor M91 (A) terminal 1, 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 FOR FRONT AIR CONTROL OUTPUT
1. Reconnect variable blower control connector M91.
2. Turn ignition switch ON.
Te r m i n a l s
Vo l ta g e
(Approx.) (+)
(−)
Connector Terminal
AVariable blower con-
trol: M911
Ground Battery voltage
BVariable blower con-
trol: M906
AWIIA0286ZZ
Connector Terminal
GroundContinuity
Variable blower control:
M912Yes
AWIIA0299ZZ
AWIIA0300ZZ

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
harness connector M90 terminal 4 and ground using an oscilloscope. Usual terminal 4 drive signal duty
ratios are shown in the table below.
Is the inspection result normal?
YES >> GO TO 5.
NO >>  Blower motor speed is stuck at speed 4: GO TO 7.
 Blower motor speed is stuck at speed 1: GO TO 8.
5.CHECK FRONT BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect front blower motor connector M62.
3. Check continuity between front blower motor terminals.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace front blower motor. Refer to XX.
6.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?
YES >> GO TO 7.
NO >> Repair harness or connector.
7.CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND VARIABLE BLOWER CONTROL
AWIIA0488ZZ
Terminal Continuity
12 Yes
SJIA0798E
AB
Continuity
Connector Terminal Connector Terminal
Front blower mo-
tor: M622Variable blower
control: M906Yes
AWIIA0302ZZ

BLOWER MOTOR CONTROL SYSTEM
HAC-123
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect front air control connector M50.
3. Check continuity between front air control harness connector
M33 (A) terminal 15 and variable blower control harness con-
nector M64 (B) terminal 8.
Is the inspection result normal?
YES >> Replace variable blower control Refer to XX.
NO >> Repair harness or connector.
8.CHECK FOR FRONT AIR CONTROL OUT PUT 2
1. Turn ignition switch OFF.
2. Disconnect front air control connector M50.
3. Turn ignition switch ON.
4. Check output signal between front air control harness connector
M50 terminal 15 and ground.
Is the inspection result normal?
YES >> Replace front air control. Refer to XX.
NO >> Replace variable blower control. Refer to XX.
Front Blower Motor Component InspectionINFOID:0000000001547420
COMPONENT INSPECTION
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:
M5015Variable blower
control: M904Yes
AWIIA0303ZZ
Te r m i n a l s
ConditionVol tag e
(Approx.) (+) (−)
Connector Terminal
Ground Front air
control:
M5015Blower mo-
tor speed:
1st
SJIA0801E
ZJIA0863J
SJIA0735E

HAC-124
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
MAGNET CLUTCH
MAGNET CLUTCH
System DescriptionINFOID:0000000001547430
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:0000000001569476
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - A/C SWITCH
1. Press the AUTO switch and A/C switch.
2. The A/C switch indicator will illuminate. Confirm that the compressor clutch engages (sound or visual
inspection).
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-diagnosis 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 INTAKE SENSOR CIRCUIT
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 6.
NO >> Repair as necessary.
SJIA0802E

MAGNET CLUTCH
HAC-125
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
6. 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 XX.
Magnet Clutch Diagnosis ProcedureINFOID:0000000001547432
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-139, "
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-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
1. Turn ignition switch OFF.
2. Disconnect compressor connector F3.
3. Start the engine.
4. Press AUTO switch and A/C switch ON.
5. Check voltage between compressor harness connector F3 ter-
minal 1 and ground.
AWIIA0304GB
Te r m i n a l s
Voltag e
(Approx.) (+) (−)
Connector Terminal
Ground
Compressor: F3 1 12V
SJIA0743E

HAC-126
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
MAGNET CLUTCH
Is the inspection result normal?
YES >> Replace A/C compressor. Refer to XX-XX, "*****".
NO >> Check 10A fuse (No. 42), located in the IPDM E/R.
 If fuse is OK, GO TO 4.
 If fuse is NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
4.CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?
OK >> GO TO 5.
NO >> Replace A/C compressor. Refer to XX-XX, "*****"
.
5.CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector E43.
3. Check continuity between compressor harness connector F3 (A)
terminal 1 and IPDM E/R harness connector E43 (B) terminal
11 .
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to XX-XX, "*****".
NO >> Repair harness or connector.
6.CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to HAC-97, "
CONSULT-III Function (BCM)".
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 7.
7.CHECK CIRCUIT CONTINUITY BETWEEN FRONT AIR CONTROL AND BCM.
1. Turn ignition switch OFF.
2. Disconnect front air control harness connector M50.
3. Disconnect BCM harness connector M19.
4. Check continuity between front air control harness connector
M33 (A) terminal 13 and BCM harness connector M19 (B) termi-
nal 61.
5. Check continuity between front air control harness connector M33 (A) terminal 13 and ground.
RJIA2005E
ABContinuity
Connector Terminal Connector Terminal
Ye s
Compressor:
F31IPDM E/R:
E4311
AWIIA0305ZZ
A/C SW ON : AIR COND SW ON
A/C SW OFF : AIR COND SW OFF
AB
Continuity
Connector Terminal Connector Terminal
Front air control:
M5013 BCM: M19 61 Yes
AWIIA0565ZZ

MAGNET CLUTCH
HAC-127
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair harness or connector.
8.CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL)
1. Reconnect front air control harness connector M50 and BCM
harness connector M19.
2. Turn ignition switch ON.
3. Confirm compressor ON signal between front air control harness
connector M50 terminal 13 and ground.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace front air control. Refer to XX.
9.CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-III
1. Start the engine.
2. Check the voltage of refrigerant pressure sensor. Refer to XX-XX, "*****"
.
WITHOUT CONSULT-III
1. Start the engine.
2. Check voltage between ECM harness connector F11 and
ground.
Is the inspection result normal?
YES >>  WITH CONSULT-III
GO TO 10.
 WITHOUT CONSULT-III
GO TO 11.
NO >> Refer to XX-XX, "*****"
.
10.CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to HAC-97, "
CONSULT-III Function (BCM)".
A
GroundContinuity
Connector Terminal
Front air control:
M5013 No
Te r m i n a l s
ConditionVo l ta g e
(Approx.) (+) (-)
Connector Terminal
Ground Front air
control:
M5013A/C switch:
ON
(Blower mo-
tor oper-
ates.)
AWIIA0486ZZ
ZJIA0584J
Te r m i n a l s
ConditionVo l ta g e
(Approx.) (+)
(-)
Connector Terminal
ECM: F1141 without
dieselGroundA/C switch: ON
(Blower motor
operates.)1-4V
78 with diesel
AWIIA0562ZZ