Nissan Tiida C11. Manual - part 844

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

A

B

Continuity

Connector

Terminal

Connector

Terminal

Ambient temperature 

sensor: M64

3

PTC control unit: 

M84

8

Yes

AWIIA0464ZZ

Terminals

Voltage

(Approx.)

(+)

(

−

)

Connector

Terminal

Ground

PTC control unit: M84

4

4.2V

SJIA0924E

A

B

Continuity

Connector

Terminal

Connector

Terminal

PTC control unit: M84

4

ECM: F10

13

Yes

A

Ground

Continuity

Connector

Terminal

PTC control unit: M84

4

No

SJIA0925E

PTC HEATER CONTROL SYSTEM

HAC-41

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

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A

B

HAC

N

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P

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

Terminals

Voltage

(Approx.)

(+)

(-)

Connector

Terminal

PTC control 

unit: M84

11

Ground

AWIIA0460ZZ

ZJIA0583J

A

B

Continuity

Connector

Terminal

Connector

Terminal

BCM: M19

50

PTC control unit: 

M84

11

Yes

A

Ground

Continuity

Connector

Terminal

PTC control unit: M84

11

No

AWIIA0461ZZ

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 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

AWIIA0601ZZ

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-43

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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. 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 Description

INFOID: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: 

M65

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