Nissan Tiida C11. Instruction — part 872
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 k
Ω
−
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 k
Ω
−
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
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
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 Description
INFOID: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
1
2
Temperature control dial: Full hot
position
Yes
Temperature control dial: Except full
hot position
No
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 Description
INFOID:0000000001682724
COMPONENT DESCRIPTION
PTC Control Unit
SJIA0968E
ALIIA0133GB
PTC HEATER CONTROL SYSTEM
HAC-155
< COMPONENT DIAGNOSIS >
[AUTO AIR CONDITIONER (W/O NAVI)]
C
D
E
F
G
H
J
K
L
M
A
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
Terminals
Voltage
(Approx.)
(+)
(
−
)
Connector
Terminal
Ground
Battery voltage
Blower relay: J-1
1
5
WJIA1783E
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