NISSAN TIIDA 2007 Service Repair Manual

HAC-28
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
MAGNET CLUTCH
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. While pressing the A/C switch, check continuity between front
air control terminals 1 and 8.
OK or NG
OK >> GO TO 16.
NG >> Replace front air control. Refer to XX.
16.CHECK FRONT AIR CONTROL GROUND CIRCUIT
Check continuity between front air control harness connector M33
terminal 8 and ground.
OK or NG
OK >> GO TO 17.
NG >> Repair harness or connector.
17.CHECK INTAKE SENSOR
Refer to HAC-31, "
Intake Sensor Component Inspection".
OK or NG
OK >> GO TO 18.
NG >> Repair or replace as necessary.
18.CHECK CAN COMMUNICATION
Check CAN communication. Refer to LAN-22, "Trouble Diagnosis Flow Chart".
BCM – ECM
 ECM – IPDM E/R
OK or NG
OK >> Replace BCM. Refer to BCS-57, "Removal and Installation of BCM".
NG >> Repair or replace malfunctioning part(s).
19.CHECK DEFROST A/C SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Press the defrost A/C switch.
NOTE:
The defrost A/C switch is located on back side of the front air
control.
4. Check continuity between BCM harness connector M19 terminal
49 and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-57, "Removal and Installation of BCM".
NG >> GO TO 20.
20.CHECK CIRCUIT CONTINUITY BETWEEN DEFROST A/C SWITCH AND BCM 1 - 8 :Continuity should exist
SJIA0756E
8 - Ground :Continuity should exist
SJIA0758E
49 - Ground :Continuity should exist
AWIIA0450ZZ

MAGNET CLUTCH
HAC-29
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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1. Disconnect defrost A/C switch connector.
2. Check continuity between BCM harness connector M19 (A) ter-
minal 49 and defrost A/C switch harness connector M49 (B) ter-
minal 15.
OK or NG
OK >> GO TO 21.
NG >> Repair harness or connector.
21.CHECK CIRCUIT CONTINUITY BETWEEN DEFROST A/C SWITCH AND GROUND
Check continuity between A/C defrost switch harness connector
M49 terminal 16 and ground.
OK or NG
OK >> Replace defrost A/C switch.
NG >> Repair harness or connector.49 - 15 :Continuity should exist
AWIIA0451ZZ
16 - Ground :Continuity should exist
WJIA2255E

HAC-30
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
INTAKE SENSOR
INTAKE SENSOR
Component InspectionINFOID:0000000001675415
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor (1) is located on the A/C unit. It converts tempera-
ture of air after it passes through the evaporator (2) into a resistance
value which is then input to the BCM.
Intake Sensor Diagnosis ProcedureINFOID:0000000001675416
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted.
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector M42
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND BCM
ZJIA0798J
AWIIA0452GB
Te r m i n a l s
Vo l ta g e
(Approx.) (+) (−)
Connector Terminal
Ground
Intake sensor: M42 1 5V
SJIA0825E

INTAKE SENSOR
HAC-31
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between intake sensor harness connector M42
(A) terminal 2 and BCM harness connector M18 (B) terminal 35.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK INTAKE SENSOR
Refer to HAC-31, "
Intake Sensor Component Inspection".
OK or NG
OK >> Replace BCM. Refer to BCS-57, "Removal and Installation of BCM".
NG >> Replace intake sensor. Refer to XX.
4.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between intake sensor harness connector M42
(A) terminal 1 and BCM harness connector M19 (B) terminal 45.
4. Check continuity between intake sensor harness connector M42
(A) terminal 1 and ground.
OK or NG
OK >> Replace BCM. Refer to BCS-57, "Removal and Installation of BCM".
NG >> Repair harness or connector.
Intake Sensor Component InspectionINFOID:0000000001675417
COMPONENT INSPECTION
Intake Sensor
AB
Continuity
Connector Terminal Connector Terminal
Intake sensor: M42 2 BCM: M18 35 Yes
AWIIA0453ZZ
AB
Continuity
Connector Terminal Connector Terminal
Intake sensor: M42 1 BCM: M19 45 Yes
A
GroundContinuity
Connector Terminal
Intake sensor: M42 1 No
AWIIA0454ZZ

HAC-32
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
INTAKE SENSOR
After disconnecting intake sensor connector M42, measure resis-
tance between terminals 1 and 2 at sensor side, using the table
below.
If NG, replace intake sensor. Refer to XXXX.
Temperature °C (°F) Resistance kΩ
−15 (5) 12.34
−10 (14) 9.62
−5 (23) 7.56
0 (32) 6.00
5 (41) 4.80
10 (50) 3.87
15 (59) 3.15
20 (68) 2.57
25 (77) 2.12
30 (86) 1.76
35 (95) 1.47
40 (104) 1.23
45 (113) 1.04
SJIA0828E

PTC HEATER CONTROL SYSTEM
HAC-33
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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PTC HEATER CONTROL SYSTEM
PTC HEATER (300 WATT)
PTC HEATER (300 WATT) : PTC Heater System DescriptionINFOID:0000000001674171
SYSTEM DESCRIPTION
The PTC heater system is controlled by ambient temperature, water temperature, FAN ON signal and temper-
ature control dial. Hot air is supplied to a discharge air outlet by PTC heater that generates heat electrically
even when engine coolant temperature is low.
Component Parts
PTC heater system components are:
 PTC control unit
 PTC heater
PTC relay-1
 Water temperature sensor
 Full hot switch
 Ambient sensor
System Operation
PTC heater system starts when all the following conditions are met:
 Less than 35 minutes after ignition switch ON.
 Blower control dial ON (Blower motor operates.) and temperature control dial full hot position (Full hot switch
ON).
 Ambient temperature is lower than 0°C (32°F).
 Engine coolant temperature is lower than 65°C (149°F) (condition
1), or when it becomes lower than 60°C (140°F) again (condition 2)
on startup.
 Engine speed is more than 1100 rpm and after a lapse of more
than 10 seconds.
PTC heater system stops when any of the following conditions is
met:
 More than 35 minutes later after ignition switch ON.
 Blower control dial OFF (Blower motor OFF) and/or temperature
control dial except full hot position (Full hot switch OFF).
 Ambient temperature is higher than 0°C (32°F).
 Engine coolant temperature is higher than 65°C (149°F).
 When engine speed becomes less than 800 rpm.
SJIA0968E
AWIIA0354GB

HAC-34
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
PTC HEATER (300 WATT) : PTC Heater Component Description
INFOID:0000000001674172
COMPONENT DESCRIPTION
PTC Control Unit
The PTC control unit is attached on the A/C unit assembly. It controls
PTC heater by ambient temperature, water temperature, FAN ON
signal and temperature control dial.
PTC Heater
The PTC heater is attached on the A/C unit assembly. It generates
heat electrically.
Ambient Sensor
The ambient sensor is attached on the radiator core support upper. It
detects ambient temperature and converts it into a resistance value
which is then input into the PTC control unit.
Water Temperature Sensor
The water temperature sensor is attached on heater pipe. It detects
water temperature and converts it into a resistance value which is
then input in to PTC control unit.
Full Hot Switch
SJIA0906E
SJIA0907E
AWIIA0600ZZ
SJIA0908E

PTC HEATER CONTROL SYSTEM
HAC-35
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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The full hot switch is attached on the A/C unit assembly. When the
temperature control dial at full hot position, and then full hot switch
turned ON.
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Diagnosis ProcedureINFOID:0000000001674173
DIAGNOSTIC PROCEDURE FOR PTC SYSTEM
SYMPTOM: PTC heater system operation is malfunction.
1.CHECK POWER SUPPLY FOR PTC RELAY-1
1. Turn ignition switch ON.
2. Check voltage between PTC relay-1 harness connector E61 ter-
minals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> Check power supply circuit and 10A fuse and 40A fusible link (No. 2 and I, located in the fuse
block). Refer to XX.
 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 PTC RELAY-1
1. Turn ignition switch OFF.
2. Check PTC relay-1. Refer to HAC-41, "
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the inspection result normal
YES >> GO TO 3.
NO >> Replace PTC relay-1. Refer to XX.
3.CHECK PTC RELAY-1 OUTPUT CIRCUIT
1. Disconnect ambient sensor, PTC heater and water temperature
sensor connectors.
2. Turn temperature control dial clockwise until full hot position.
3. Turn mode control dial to foot position.
4. Start the engine.
5. Turn blower control dial to maximum speed.
6. Check resistance between PTC relay-1 harness connector E61
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 5.
SJIA0909E
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-1: E612
3
SJIA0913E
Connector Terminal
GroundContinuity
PTC relay-1: E61 1 Yes
AWIIA0455ZZ

HAC-36
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
NO >> GO TO 4.
4.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Disconnect PTC control unit connector.
3. Check continuity between PTC control unit harness connector
M84 (A) terminal 2 and PTC relay-1 harness connector E61 (B)
terminal 1.
Is the inspection result normal
YES >> GO TO 5.
NO >> GO TO 7.
5.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND PTC HEATER
1. Disconnect PTC heater connector.
2. Check continuity between PTC relay-1 harness connector E61
(A) terminal 5 and PTC heater harness connector M66 (B) termi-
nal 1.
Is the inspection result normal
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK PTC HEATER GROUND CIRCUIT
Check continuity between PTC heater harness connector M66 termi-
nal 2 and ground.
Is the inspection result normal
YES >> Replace PTC heater. Refer to XX.
NO >> Repair harness or connector.
7.CHECK POWER SUPPLY VOLTAGE FOR PTC CONTROL UNIT
1. Turn ignition switch ON.
2. Check voltage between PTC control unit harness connector
M84 terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 8.
AB
Continuity
Connector Terminal Connector Terminal
PTC control unit: M84 2PTC relay-1:
E611Yes
AWIIA0456ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-1:
E615 PTC heater: M66 1 Yes
SJIA0915E
Connector Terminal
GroundContinuity
PTC heater:
M662Yes
SJIA0916E
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC control unit: M84 1
SJIA0911E

PTC HEATER CONTROL SYSTEM
HAC-37
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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NO >> Repair harness or connector.
8.CHECK GROUND CIRCUIT FOR PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Check continuity between PTC control unit harness connector
M84 terminal 7 and ground.
Is the inspection result normal
YES >> GO TO 9.
NO >> Repair harness or connector.
9.CHECK FULL HOT CIRCUIT BETWEEN PTC CONTROL UNIT AND GROUND
1. Reconnect PTC control unit and PTC relay-1 connector.
2. Turn ignition switch ON.
3. Check voltage between full hot switch harness connector M65
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 12.
NO >> GO TO 10.
10.CHECK CIRCUIT CONTINUITY BETWEEN FULL HOT SWITCH AND PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Disconnect full hot switch and PTC control unit connector.
3. Check continuity between full hot switch harness connector M65
(A) terminal 1, 2 and PTC control unit harness connector M84
(B) terminal 3, 8.
4. Check continuity between full hot switch harness connector M65 (A) terminal 1, 2 and ground.
Is the inspection result normal
YES >> GO TO 11.
NO >> Repair harness or connector.
11 .CHECK FULL HOT SWITCH
Connector Terminal
GroundContinuity
PTC control unit: M84 7 Yes
SJIA0912E
Te r m i n a l s
ConditionVol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
PTC control
unit: M651Temperature control dial:
Full hot position.0V
Temperature control dial:
Except full hot position.5V
AWIIA0457ZZ
AB
Continuity
Connector Terminal Connector Terminal
Full hot switch:
M651
PTC control unit:
M843
Ye s
28
(+) (-) Continuity
Connector Terminal
Ground Yes
Full hot switch: M651
2
AWIIA0458ZZ