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![NISSAN TIIDA 2007 Service Repair Manual 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. Disc NISSAN TIIDA 2007 Service Repair Manual 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. Disc](/manual-img/5/57395/w960_57395-3368.png)
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
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NO >> Repair harness or connector.
8.CHECK GROUND CIRCUIT FOR PTC CONTROL UNIT
1. Tur NISSAN TIIDA 2007 Service Repair Manual PTC HEATER CONTROL SYSTEM
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NO >> Repair harness or connector.
8.CHECK GROUND CIRCUIT FOR PTC CONTROL UNIT
1. Tur](/manual-img/5/57395/w960_57395-3369.png)
PTC HEATER CONTROL SYSTEM
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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
Page 3371 of 5883
![NISSAN TIIDA 2007 Service Repair Manual HAC-38
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
Check full hot switch. Refer to HAC-41, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the in NISSAN TIIDA 2007 Service Repair Manual HAC-38
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
Check full hot switch. Refer to HAC-41, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the in](/manual-img/5/57395/w960_57395-3370.png)
HAC-38
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
Check full hot switch. Refer to HAC-41, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component
Inspection".
Is the inspection result normal
YES >> Replace the PTC control unit. Refer to XX.
NO >> Replace full hot switch. Refer to XX.
12.CHECK VOLTAGE BETWEEN WATER TEMPERATURE SENSOR AND GROUND
Check voltage between water temperature sensor harness connec-
tor M64 terminal 1 and ground.
Is the inspection result normal
YES >> GO TO 14.
NO >> GO TO 13.
13.CHECK CIRCUIT CONTINUITY BETWEEN WATER TEMPERATURE SENSOR AND PTC CONTROL
UNIT
1. Turn ignition switch OFF.
2. Disconnect PTC control unit.
3. Check continuity between water temperature sensor harness
connector M64 (A) terminal 1 and PTC control unit harness con-
nector M84 (B) terminal 9.
4. Check continuity between water temperature sensor harness
connector M64 (A) terminal 1 and ground.
Is the inspection result normal
YES >> Replace PTC control unit. Refer to XX.
NO >> Repair harness or connector.
14.CHECK WATER TEMPERATURE SENSOR
Refer to HAC-41, "
PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component Inspection".
Is the inspection result normal
YES >> GO TO 15.
NO >> Replace water temperature sensor. Refer to XX.
15.CHECK CIRCUIT CONTINUITY BETWEEN WATER TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (−)
Connector Terminal
Ground 5V
Water temperature sensor:
M641
SJIA0920E
AB
Continuity
Connector Terminal Connector Terminal
Water temperature
sensor: M641PTC control
unit: M849Yes
A
Continuity
Connector Terminal
Water temperature sensor: M64 1 Ground No
SJIA0921E
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PTC HEATER CONTROL SYSTEM
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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 AMBIENT TEMPERATURE SENSOR AND GROUND
1. Reconnect PTC control unit connector.
2. Turn ignition switch ON.
3. Check voltage between ambient temperature sensor harness
connector M60 terminal 4 and ground.
Is the inspection result normal
YES >> GO TO 18.
NO >> GO TO 17.
17.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND PTC CONTROL
UNIT
1. Turn ignition switch OFF.
2. Check continuity between ambient temperature sensor harness
connector M60 (A) terminal 4 and PTC control unit harness con-
nector M84 (B) terminal 10.
3. Check continuity between ambient temperature sensor harness
connector E60 (A) terminal 4 and ground.
Is the inspection result normal
YES >> Replace PTC control unit. Refer to XXXX.
NO >> Repair harness or connector.
18.CHECK AMBIENT TEMPERATURE SENSOR
Refer to HAC-245, "
Ambient Sensor Component Inspection".
Is the inspection result normal
YES >> GO TO 19.
NO >> Replace ambient temperature sensor. Refer to XX.
AB
Continuity
Connector Terminal Connector Terminal
Water temperature
sensor: M642PTC control unit:
M848Yes
SJIA0923E
Te r m i n a l s
Vol tag e
(Approx.) (+) (−)
Connector Terminal
Ground
Ambient temperature sen-
sor: M6045V
AWIIA0462ZZ
AB
Continuity
Connector Terminal Connector Terminal
Ambient temperature
sensor: E604PTC control
unit: M8410 Yes
A
GroundContinuity
Connector Terminal
Ambient temperature sensor: E60 4 No
AWIIA0463ZZ
Page 3373 of 5883
![NISSAN TIIDA 2007 Service Repair Manual HAC-40
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
19.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Check continuity between ambient te NISSAN TIIDA 2007 Service Repair Manual HAC-40
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
19.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Check continuity between ambient te](/manual-img/5/57395/w960_57395-3372.png)
HAC-40
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
19.CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT TEMPERATURE SENSOR AND PTC CONTROL
UNIT
Check continuity between ambient temperature sensor harness con-
nector M60 (A) terminal 3 and PTC control unit harness connector
M84 (B) terminal 8.
Is the inspection result normal
YES >> 1. If equipped with manual transmission, GO TO 20.
2. If equipped with automatic transmission, GO TO 22.
NO >> Repair harness or connector.
20.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 22.
NO >> GO TO 21.
21.CHECK CONTINUITY OF ENGINE RPM CIRCUIT BETWEEN FRONT AIR CONNTROL 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.
22.CHECK BCM INPUT (FAN ON) SIGNAL
AB
Continuity
Connector Terminal Connector Terminal
Ambient temperature
sensor: M643PTC control unit:
M848Yes
AWIIA0464ZZ
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
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2. Confirm fan on signal between PTC cont](/manual-img/5/57395/w960_57395-3373.png)
PTC HEATER CONTROL SYSTEM
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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 23.
23.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:0000000001674174
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
Page 3375 of 5883
HAC-42
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
PTC HEATER CONTROL SYSTEM
After disconnecting ambient sensor connector E60, measure resis-
tance between terminals 3 and 4 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. Refer to XX.
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
AWIIA0601ZZ
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
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PTC HEATER CONTROL SYSTEM
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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. Refer to XX.
PTC relay-1
Check continuity between terminal Nos. 3 and 5.
If NG, replace PTC relay-1. Refer to XX.
PTC HEATER (1500 WATT)
PTC HEATER (1500 WATT) : System DescriptionINFOID:0000000001682730
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
Connector Terminals Condition Continuity
Full hot switch:
M6512Temperature 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