Nissan Tiida C11. Manual - 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