Nissan Qashqai (2007-2010). Manual - part 929

HAC-76

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

PTC HEATER

• BCM – IPDM E/R
• BCM  –  ECM
Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace malfunctioning part(s).

Component Inspection

INFOID:0000000001026740

PTC HEATER

The PTC heater (1) is attached to the A/C unit assembly.
It generates heat electrically.

PTC RELAY

Check continuity between terminal 3 and 5.

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Terminal

Condition

Continuity

3 and 5

12V direct current supply between terminal 1 and 2

Exist

No current supply

Not exist

PBIB0098E

OAT SENSOR

HAC-77

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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OAT SENSOR

Description

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COMPONENT DESCRIPTION

OAT (Outside Air Temperature) Sensor

The OAT sensor (1) is attached on the radiator core support. It
detects ambient temperature and converts it into a resistance value
which is then input into the auto amp.

OAT Sensor Circuit

AMBIENT TEMPERATURE INPUT PROCESS

The auto amp. includes a processing circuit for the OAT sensor input. However, when the temperature
detected by the OAT sensor increases quickly, the processing circuit retards the auto amp. function. It only
allows the auto amp. to recognize an ambient temperature increase of 0.33

°

C (0.6

°

F) per 100 seconds.

As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature has not changed, the temperature detected by the OAT sensor will increase. This is because the heat
from the engine compartment can radiate to the front bumper area, location of the OAT sensor.

Component Function Check

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1.

PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Refer to 

HAC-27, "Diagnosis Description"

, see No. 1 to 3.

21 or 

−

21 is displayed.

YES

>> Go to Diagnosis Procedure. Refer to 

HAC-77, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

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1.

CHECK VOLTAGE BETWEEN OAT SENSOR AND GROUND

1.

Disconnect OAT sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between OAT sensor harness connector E52 terminal 4 and ground.

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JPIIA0125GB

HAC-78

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

OAT SENSOR

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN OAT SENSOR AND AUTO AMP. 

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between OAT sensor harness connector E52 terminal 3 and auto amp. harness connec-
tor M53 terminal 26.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK OAT SENSOR

Refer to 

HAC-78, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace auto amp.

NO

>> Replace OAT sensor.

4.

CHECK CIRCUIT CONTINUITY BETWEEN OAT SENSOR AND AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between OAT sensor harness connector E52 terminal 4 and auto amp. harness connec-
tor M53 terminal 28.

4.

Check continuity between OAT sensor harness connector E52 terminal 4 and ground.

Is the inspection result normal?

YES

>> Replace auto amp.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000000954663

(+)

(

−

)

Voltage

OAT sensor

—

Connector

Terminal

E52

4

Ground

Approx. 5

OAT sensor

Auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E52

3

M53

26

Continuity should exist

OAT sensor

Auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E52

4

M53

28

Continuity should exist

OAT sensor

—

Continuity

Connector

Terminal

E52

4

Ground

Continuity should not exist

OAT SENSOR

HAC-79

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

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G

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HAC

N

O

P

After disconnecting OAT sensor (1) connector E52, measure resis-
tance between terminals 3 and 4 at sensor side. Refer to table
below.

If NG, replace OAT sensor.

Temperature 

°

C (

°

F)

Resistance k

Ω

−

30 (

−

22)

13.33

−

20 (

−

4)

7.89

−

10 (14)

4.80

0 (32)

6.19

5 (41)

1.81

10 (50)

1.16

20 (68)

0.77

30 (86)

0.52

40 (104)

0.36

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