2007 NISSAN TIIDA Electrical control unit

PTC HEATER CONTROL SYSTEM
HAC-43
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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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

PTC HEATER CONTROL SYSTEM
HAC-45
< COMPONENT DIAGNOSIS >[MANUAL AIR CONDITIONER]
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D
E
F
G
H
J
K
L
MA
B
HAC
N
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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:0000000001682732
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

PTC HEATER CONTROL SYSTEM
HAC-143
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
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PTC HEATER (300 WATT) : PTC Heater Component DescriptionINFOID:0000000001682707
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.
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
The full hot switch is attached on the A/C unit assembly. When the
temperature control dial at full hot position, then full hot switch is
turned ON.
Ambient Sensor
SJIA0906E
SJIA0907E
SJIA0908E
SJIA0909E

PTC HEATER CONTROL SYSTEM
HAC-153
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
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

PTC HEATER CONTROL SYSTEM
HAC-155
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
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

PTC HEATER CONTROL SYSTEM
HAC-257
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
PTC HEATER (300 WATT) : PTC Heater Component DescriptionINFOID:0000000001548106
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.
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
The full hot switch is attached on the A/C unit assembly. When the
temperature control dial at full hot position, then full hot switch is
turned ON.
Ambient Sensor
SJIA0906E
SJIA0907E
SJIA0908E
SJIA0909E

PTC HEATER CONTROL SYSTEM
HAC-267
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
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:0000000001679705
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

PTC HEATER CONTROL SYSTEM
HAC-269
< COMPONENT DIAGNOSIS >[AUTO AIR CONDITIONER (W/NAVI)]
C
D
E
F
G
H
J
K
L
MA
B
HAC
N
O
P
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:0000000001679707
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