Nissan Tiida C11. Manual - part 870

HAC-144

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

PTC HEATER CONTROL SYSTEM

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 front air control.

PTC HEATER (300 WATT) : PTC Heater (300 Watt) Diagnosis Procedure

INFOID:0000000001682708

DIAGNOSTIC PROCEDURE FOR PTC SYSTEM

SYMPTOM: PTC heater system operation is malfunction.

1.

CHECK POWER SUPPLY FOR PTC RELAY-1

1.

Turn ignition switch ON.

2.

Check voltage between PTC relay-1 harness connector E61 ter-
minals 2, 3, and ground.

Is the inspection result normal

YES

>> GO TO 2.

NO

>>

Check power supply circuit and 10A fuse (No. 2) and 40A fusible link (No. I), located in the fuse
and fusible link box.

• If fuses are OK, check harness for open circuit. Repair or replace if necessary.
• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.

2.

CHECK PTC RELAY-1

1.

Turn ignition switch OFF.

2.

Check PTC relay-1. Refer to 

HAC-151, "PTC HEATER (300 WATT) : PTC Heater (300 Watt) Component

Inspection"

.

Is the inspection result normal

YES

>> GO TO 3.

NO

>> Replace PTC relay-1. Refer to XX.

3.

CHECK PTC RELAY-1 OUTPUT CIRCUIT

1.

Disconnect ambient sensor, PTC heater and water temperature
sensor connectors.

2.

Turn temperature control dial clockwise until full hot position.

3.

Turn mode control dial to foot position.

4.

Start the engine.

5.

Turn blower control dial to maximum speed.

6.

Check continuity between PTC relay-1 harness connector E61
terminal 1 and ground.

Is the inspection result normal

YES

>> GO TO 5.

AWIIA0600ZZ

Terminals

Voltage

(Approx.)

(+)

(

−

)

Connector

Terminal

Ground

Battery voltage

PTC relay-1: E61

2

3

SJIA0913E

Connector

Terminal

Ground

Continuity

PTC relay-1: E61

1

Yes

AWIIA0455ZZ

PTC HEATER CONTROL SYSTEM

HAC-145

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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.

A

B

Continuity

Connector

Terminal

Connector

Terminal

PTC control unit: M84

2

PTC relay-1: 

E61

1

Yes

AWIIA0456ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

PTC relay-1: 

E61

5

PTC heater: M66

1

Yes

SJIA0915E

Connector

Terminal

Ground

Continuity

PTC heater: 

M66

2

Yes

SJIA0916E

Terminals

Voltage

(Approx.)

(+)

(

−

)

Connector

Terminal

Ground

Battery voltage

PTC control unit: M84

1

SJIA0911E

HAC-146

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

PTC HEATER CONTROL SYSTEM

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

Ground

Continuity

PTC control unit: M84

7

Yes

SJIA0912E

Terminals

Condition

Voltage

(Approx.)

(+)

(

−

)

Connector

Terminal

Ground

Full hot switch: 

M65

1

Temperature control dial: 
Full hot position.

0V

Temperature control dial: 
Except full hot position.

5V

AWIIA0457ZZ

A

B

Continuity

Connector

Terminal

Connector

Terminal

Full hot switch: 

M65

1

PTC control unit: 

M84

3

Yes

2

8

(+)

(-)

Continuity

Connector

Terminal

Ground

Yes

Full hot switch: M65

1

2

AWIIA0458ZZ

PTC HEATER CONTROL SYSTEM

HAC-147

< COMPONENT DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Check full hot switch. Refer to 

HAC-151, "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-151, "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

Terminals

Voltage

(Approx.)

(+)

(

−

)

Connector

Terminal

Ground

5V

Water temperature sensor: 

M64

1

SJIA0920E

A

B

Continuity

Connector

Terminal

Connector

Terminal

Water temperature 

sensor: M64

1

PTC control 

unit: M84

9

Yes

A

Continuity

Connector

Terminal

Water temperature sensor: M64

1

Ground

No

SJIA0921E