NISSAN TIIDA 2007 Service Repair Manual

HAC-148
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
Check continuity between water temperature sensor harness con-
nector M64 (A) terminal 2 and PTC control unit harness connector
M84 (B) terminal 8.
Is the inspection result normal
YES >> GO TO 16.
NO >> Repair harness or connector.
16.CHECK VOLTAGE BETWEEN PTC CONTROL UNIT AND GROUND
1. Turn ignition switch ON.
2. Check voltage between PTC heater harness connector M84 ter-
minal 10 and ground.
Is the inspection result normal
YES >> 1. If equipped with manual transmission, GO TO 22.
2. If equipped with automatic transmission, GO TO 24.
NO >> GO TO 17.
17.CHECK CIRCUIT CONTINUITY BETWEEN PTC CONTROL UNIT AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control and PTC control unit connector.
3. Check continuity between PTC control unit harness connector
M84 (A) terminal 10 and front air control harness connector M85
(B) terminal 9.
4. Check continuity between PTC control unit harness connector
M84 (A) terminal 10 and ground.
Is the inspection result normal
YES >> GO TO 18.
NO >> Repair harness or connector.
18.CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
AB
Continuity
Connector Terminal Connector Terminal
Water temperature
sensor: M642PTC control unit:
M848Yes
SJIA0923E
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground 5V
PTC control unit: M84 10
AWIIA0521ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC control unit: M84 10Front air control:
M859Yes
A
GroundContinuity
Connector Terminal
PTC control unit: M84 10 No
AWIIA0525ZZ

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

PTC HEATER CONTROL SYSTEM
HAC-151
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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1. Turn blower control dial to "1" position.
2. Confirm fan on signal between PTC control unit harness con-
nector M84 terminal 11 and ground using oscilloscope.
Is the inspection result normal
YES >> Replace PTC control unit.
NO >> GO TO 25.
25.CHECK CIRCUIT CONTINUITY BETWEEN BCM AND PTC CONTROL UNIT
1. Turn ignition switch OFF.
2. Disconnect BCM connector and PTC control unit connector.
3. Check continuity between BCM harness connector M19 (A) ter-
minal 50 and PTC control unit harness connector M84 (B) ter-
minal 11.
4. Check continuity between PTC control unit harness connector
M84 (A) terminal 11 and ground.
Is the inspection result normal
YES >> Replace BCM. Refer to XX.
NO >> Repair harness or connector.
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component Inspection
INFOID:0000000001682709
COMPONENT INSPECTION
Ambient Sensor
Te r m i n a l s
Vo l ta g e
(Approx.) (+)
(-)
Connector Terminal
PTC control
unit: M8411 Ground
AWIIA0460ZZ
ZJIA0583J
AB
Continuity
Connector Terminal Connector Terminal
BCM: M19 50PTC control unit:
M8411 Ye s
A
GroundContinuity
Connector Terminal
PTC control unit: M84 11 No
AWIIA0461ZZ

HAC-152
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
After disconnecting ambient sensor (1) connector E60, measure
resistance between terminals 1 and 2 at sensor side, using the table
below.
If NG, replace ambient sensor. Refer to XX.
Water Temperature Sensor
After disconnecting water temperature sensor connector M64, mea-
sure resistance between terminals 1 and 2 at sensor side, using the
table below.
If NG, replace water temperature sensor.
Full Hot Switch
Temperature °C (°F) Resistance kΩ
−15 (5) 12.73
−10 (14) 9.92
−5 (23) 7.80
0 (32) 6.19
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
45 (113) 1.07
AWIIA0603ZZ
Temperature °C (°F) Resistance kΩ
−20 (−4) 31.62
−10 (14) 17.47
0 (32) 10.09
10 (50) 6.05
20 (68) 3.76
30 (86) 2.41
40 (104) 1.59
50 (122) 1.08
60 (140) 0.75
70 (158) 0.53
80 (176) 0.38
90 (194) 0.28
100 (212) 0.21
SJIA0929E

PTC HEATER CONTROL SYSTEM
HAC-153
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After disconnecting full hot switch connector M65, check continuity
between terminals 1 and 2 at switch side.
If NG, replace full hot switch.
PTC relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace PTC relay.
PTC HEATER (1500 WATT)
PTC HEATER (1500 WATT) : System DescriptionINFOID:0000000001682723
SYSTEM DESCRIPTION
The PTC heater system is controlled by ambient temperature, water temperature, FAN ON signal. 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
Terminals Condition Continuity
12Temperature control dial: Full hot
positionYe s
Temperature control dial: Except full
hot positionNo
SJIA0930E
Condition Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
SJIA0931E

HAC-154
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
 PTC heater
PTC relays
 Ambient sensor
 Blower relay
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.)
 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.
 Fan control dial OFF (Blower motor 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.
PTC HEATER (1500 WATT) : Component DescriptionINFOID:0000000001682724
COMPONENT DESCRIPTION
PTC Control Unit
SJIA0968E
ALIIA0133GB

PTC HEATER CONTROL SYSTEM
HAC-155
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The PTC control unit is attached on the A/C unit assembly. It controls
PTC heater by ambient temperature, and FAN ON signal.
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.
PTC HEATER (1500 WATT) : PTC Heater (1500 Watt) Diagnosis Procedure
INFOID:0000000001682725
DIAGNOSTIC PROCEDURE FOR PTC SYSTEM
SYMPTOM: PTC heater system operation is malfunction.
1.CHECK POWER SUPPLY FOR BLOWER RELAY
1. Turn ignition switch ON.
2. Disconnect blower relay.
3. Check voltage between blower relay harness connector J-1 ter-
minals 1, 5, and ground.
Is the inspection result normal
YES >> GO TO 2.
NO >> Repair harness or connector.
SJIA0906E
ALIIA0132ZZ
AWIIA0600ZZ
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
Blower relay: J-11
5
WJIA1783E

HAC-156
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
PTC HEATER CONTROL SYSTEM
2.CHECK BLOWER RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower relay harness connector J-1
terminal 2 and ground.
Is the inspection result normal
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK BLOWER RELAY
1. Turn ignition switch OFF.
2. Check blower relay. Refer to XX-XX, "*****"
.
Is the inspection result normal
YES >> GO TO 4.
NO >> Replace blower relay.
4.CHECK POWER SUPPLY FOR PTC RELAY-1
1. Turn ignition switch OFF.
2. Reconnect blower relay.
3. Turn ignition switch ON.
4. Check voltage between PTC relay-1 harness connector E61 ter-
minals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 5.
NO >> Check power supply circuit and 10A and 40A fuse (No. 16 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.
5.CHECK POWER SUPPLY FOR PTC RELAY-2
Check voltage between PTC relay-2 harness connector E62 termi-
nals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 6.
NO >> Check power supply circuit and 80A fuse (N, 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.
Connector Terminal
GroundContinuity
Blower relay: J-1 2 Yes
WJIA2264E
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-2: E612
3
AWIIA0466ZZ
Te r m i n a l s
Voltag e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-2: E622
3
AWIIA0466ZZ

PTC HEATER CONTROL SYSTEM
HAC-157
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
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6.CHECK POWER SUPPLY FOR PTC RELAY-3
Check voltage between PTC relay-3 harness connector E61 termi-
nals 2, 3, and ground.
Is the inspection result normal
YES >> GO TO 5.
NO >> Check power supply circuit and 80A fuse (P, located in the fuse block). Refer to XX-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.
7.CHECK PTC RELAYS
1. Turn ignition switch OFF.
2. Check PTC relay. Refer to XX-XX, "*****"
.
Is the inspection result normal
YES >> GO TO 6.
NO >> Replace inoperative PTC relay.
8.CHECK PTC RELAY-1 GROUND CIRCUIT
1. Disconnect ambient sensor, and PTC heater connectors.
2. Turn temperature control dial clockwise until full hot position.
3. Turn mode control dial to foot position.
4. Start the engine (1,000 RPM minimum).
5. Turn blower control dial to low speed.
6. Check continuity between PTC relay-1 harness connector E61
terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 10.
NO >> GO TO 9.
9.CHECK CIRCUIT CONTINUITY BETWEEN PTC RELAY-1 AND BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between PTC relay-1 harness connector E61
(A) terminal 1 and BCM harness connector M19 (B) terminal 64.
Is the inspection result normal
YES >> Replace BCM. Refer to XXXX.
NO >> Repair harness or connector.
10.CHECK PTC RELAY-2 GROUND CIRCUIT
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground Battery voltage
PTC relay-3: E632
3
AWIIA0466ZZ
Connector Terminal
GroundContinuity
PTC relay-1: E61 1 Yes
AWIIA0455ZZ
AB
Continuity
Connector Terminal Connector Terminal
PTC relay-1: E61 1 BCM: M19 64 Yes
AWIIA0467ZZ