2007 NISSAN TIIDA front

PTC HEATER CONTROL SYSTEM
HAC-149
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector E60.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector E60
terminal 2 and ground.
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 21.
19.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector M51.
3. Check continuity between ambient sensor harness connector
E60 (A) terminal 1 and front air control harness connector M51
(B) terminal 33.
Is the inspection result normal?
YES >> GO TO 20.
NO >> Repair harness or connector.
20.CHECK AMBIENT SENSOR
Refer to HAC-151, "
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component Inspection".
Is the inspection result normal?
YES >> 1. Replace front air control. Refer to XX.
2. Go to self-diagnosis HAC-213, "
Front Air Control Self-Diagnosis" and perform self-diagnosis
STEP-2. Confirm that code No. 20 is displayed.
NO >> 1. Replace ambient sensor. Refer to XX.
2. Go to self-diagnosis HAC-213, "
Front Air Control Self-Diagnosis" and perform self-diagnosis
STEP-2. Confirm that code No. 20 is displayed.
21.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector M51.
3. Check continuity between ambient sensor harness connector
E60 (A) terminal 2 and front air control harness connector M51
(B) terminal 30.
4. Check continuity between ambient sensor harness connector
E34 (A) terminal 2 and ground.
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
Ambient sensor:
E6025V
AWIIA0307ZZ
AB
Continuity
Connector Terminal Connector Terminal
Ambient sensor:
E601Front air control:
M5133 Yes
AWIIA0308ZZ
AB
Continuity
Connector Terminal Connector Terminal
Ambient sensor:
E602Front air control:
M5130 Yes
AWIIA0309ZZ

HAC-150
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
Is the inspection result normal?
YES >> 1. Replace front air control. Refer to XX.
2. Go to self-diagnosis HAC-213, "
Front Air Control Self-Diagnosis" and perform self-diagnosis
STEP-2. Confirm that code No. 20 is displayed.
NO >> Repair harness or connector.
22.CHECK ENGINE RPM SIGNAL (MANUAL TRANSMISSION)
1. Reconnect PTC control unit.
2. Start the engine.
3. Check voltage between PTC control unit harness connector
M84 terminal 4 and ground.
Is the inspection result normal
YES >> GO TO 24.
NO >> GO TO 23.
23.CHECK CONTINUITY OF ENGINE RPM CIRCUIT BETWEEN FRONT AIR CONTROL AND PTC CON-
TROL UNIT (MANUAL TRANSMISSION)
1. Turn ignition switch OFF.
2. Disconnect ECM and PTC control unit connector.
3. Check continuity between PTC control unit harness connector
M84 (A) terminal 4 and ECM harness connector F10 (B) termi-
nal 13.
4. Check continuity between PTC control unit harness connector
M84 (A) terminal 4 and ground.
Is the inspection result normal
YES >> Replace ECM. Refer to XX.
NO >> Repair harness or connector.
24.CHECK BCM INPUT (FAN ON) SIGNAL
A
GroundContinuity
Connector Terminal
Ambient sensor:
E602No
Te r m i n a l s
Vo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC control unit: M84 4 4.2V
SJIA0924E
AB
Continuity
Connector Terminal Connector Terminal
PTC control unit: M84 4 ECM: F10 13 Yes
A
GroundContinuity
Connector Terminal
PTC control unit: M84 4 No
SJIA0925E

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-163
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component DescriptionINFOID:0000000001547446
COMPONENT DESCRIPTION
Front Air Control
The front air control has a built-in microcomputer which processes information sent from various sensors
needed for air conditioner operation. The air mix door motor, mode door motor, intake door motor, blower
motor and compressor are then controlled.
The front air control is unitized with control mechanisms. Signal from various switches and Potentio Tempera-
ture Control (PTC) are directly entered into front air control.
Self-diagnostic functions are also built into front air control to provide quick check of malfunctions in the auto
air conditioner system.
Potentio Temperature Control (PTC)
The PTC is built into the front air control. It can be set at an interval of 1°C (34°F) in the 18°C (64°F) to 32°C
(90°F) temperature range by turning temperature control switch. The set temperature is displayed.
Front Air Control Component Function CheckINFOID:0000000001547447
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE
1. Press the AUTO switch and A/C switch.
2. Display should indicate AUTO. 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 a 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.CHECK POWER AND GROUND CIRCUIT
Check main power supply and ground circuit. Refer to HAC-163, "
Front Air Control Power and Ground Diag-
nosis Procedure".
Is the inspection result normal?
YES >> System OK.
NO >> Replace Front air control. Refer to XX.
Front Air Control Power and Ground Diagnosis ProcedureINFOID:0000000001547448
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
AWIIA0289GB

HAC-164
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
1.CHECK POWER SUPPLY CIRCUIT FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector M50.
3. Check voltage between front air control harness connector M50
terminal 1, 7, 17 and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check 10A fuses [Nos. 2, 13 and 16, 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 GROUND CIRCUIT FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Check continuity between front air control harness connector
M50 terminal 10 and ground.
Is the inspection result normal?
YES >> Replace front air control. Refer to XX.
NO >> Repair or replace harness.
Terminals Ignition switch position
(+)
(-) OFF ACC ON
Connector Terminal
Front air control:
M501
GroundBattery
voltageBattery
voltageBattery
voltage
7Approx.
0VApprox.
0VBattery
voltage
17Approx.
0VApprox.
0VBattery
voltage
SJIA0786E
Connector Terminal
GroundContinuity
Front air control:
M5010 Yes
SJIA0787E

AIR CONDITIONER CONTROL
HAC-165
< ECU DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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ECU DIAGNOSIS
AIR CONDITIONER CONTROL
Front Air Control Terminals Reference ValuesINFOID:0000000001547449
Measure voltage between each terminal and ground by following terminals and reference value for front air
control.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR FRONT AIR CONTROL
AWIIA0502ZZ
Te r m i n a l
No.Wire
colorItemIgnition
switchConditionVo l ta g e
(V)
1 LG Power supply for BAT OFF-
Battery voltage
3RPower supply for intake door
PBR (5V output)ON - Approx. 5
4BREngine coolant temperature
sensor signalONAt idle (after warming up, ap-
prox. 80°C)
CAUTION:
The wave forms vary de-
pending on coolant tempera-
ture.
5 B Illumination ground ON - Approx. 0
7 R Power supply for IGN 2 OFF - Battery voltage
9 V PTC Heater ON/OFF signal ON Full Hot switch ON Approx. 12
10 B Ground ON - Approx. 0
12 P Blower motor ON signal ON FAN speed: 1st step (manual)
13 O Compressor ON signal ONA/C switch: ON
(Blower motor operates.)
SKIB3651J
ZJIA0583J
ZJIA0584J

INSUFFICIENT COOLING
HAC-185
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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INSUFFICIENT COOLING
Component Function CheckINFOID:0000000001547452
SYMPTOM: Insufficient cooling
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Press the AUTO switch.
2. Turn temperature control dial (driver) counterclockwise until 16° C (60° F) is displayed.
3. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to HAC-87, "
Operational Check".
Does another symptom exist?
YES >> Refer to HAC-184, "SymptomMatrixChart".
NO >> System OK.
3.CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
4.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis Refer to HAC-98, "
Front Air Control Self-Diagnosis".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Refer to HAC-104, "
A/C System Self-Diagnosis Code Chart".
5.CHECK DRIVE BELTS
Check compressor belt tension. Refer to XX-XX, "*****"
.
Is the inspection result normal?
OK >> GO TO 6.
NG >> Adjust or replace compressor belt. Refer to XX-XX, "*****"
.
6.CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation. Refer to XX-XX, "*****"
Does air mix door operate correctly?
YES >> GO TO 7.
NO >> Check air mix door motor circuit. Refer to HAC-112, "
Air Mix Door Motor Diagnosis Procedure" or
XX-XX, "*****"
.
7.CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation. Refer to XX-XX, "*****"
.
Does cooling fan motor operate correctly?
YES >> GO TO 8.
NO >> Check cooling fan motor. Refer to XX-XX, "*****"
.
8.CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/
recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.
>> GO TO 9.

HAC-192
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
INSUFFICIENT COOLING
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes be-
comes negative. Air conditioning system does
not function and does not cy-
clically cool the compart-
ment air.
 The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.Refrigerant does not discharge
cyclically.
↓
Moisture is frozen at expan-
sion valve outlet and inlet.
↓
Water is mixed with refrigerant. Drain water from refrigerant
or replace refrigerant.
 Replace liquid tank.
AC354A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
Liquid tank or front/rear side of
expansion valve’s pipe is frost-
ed or dewed.High-pressure side is closed
and refrigerant does not flow.
↓
Expansion valve or liquid tank
is frosted.Leave the system at rest until
no frost is present. Start it
again to check whether or not
the malfunction is caused by
water or foreign particles.
 If water is the cause, initially
cooling is okay. Then the wa-
ter freezes causing a block-
age. Drain water from
refrigerant or replace refrig-
erant.
 If due to foreign particles, re-
move expansion valve and
remove the particles with dry
and compressed air (not
shop air).
 If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
 Replace liquid tank.
 Check oil for contamination.
AC362A

INSUFFICIENT HEATING
HAC-193
< SYMPTOM DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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INSUFFICIENT HEATING
Component Function CheckINFOID:0000000001547457
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Press the AUTO switch.
2. Turn the temperature control dial (driver) clockwise until 32° C (90° F) is displayed.
3. Check for hot air at discharge air outlets.
Can this symptom be duplicated?
YES >> GO TO 2.
NO >> Perform complete system 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 self-diagnosis. Refer to HAC-98, "
Front Air Control Self-Diagnosis".
Is the inspection results normal?
YES >> GO TO 4.
NO >> Refer to HAC-197, "
Self-Diagnosis".
4.CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to XX-XX, "*****"
.
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to XX-XX, "*****"
.
4. Check for air in cooling system.
>> GO TO 5.
5.CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Check the air mix door motor circuit. Refer to HAC-112, "
Air Mix Door Motor Diagnosis Proce-
dure".
6.CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair all disconnected or leaking air ducts.
7.CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
Is the inspection result normal?
YES >> Hot inlet hose and a warm outlet hose: GO TO 8.
NO >> Both hoses warm: GO TO 9.
8.CHECK ENGINE COOLANT SYSTEM
Check engine control temperature sensor. Refer to XX-XX, "*****"
.
Is the inspection result normal?