Nissan Teana J32. Manual - part 699

U1010 CONTROL UNIT (CAN)

HAC-165

< COMPONENT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

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U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000003884737

Initial diagnosis of A/C auto amp.

DTC Logic

INFOID:0000000003884738

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000003884739

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

Is DTC “U1010” displayed?

YES

>> Replace A/C auto amp.

NO

>> INSPECTION END

DTC

Items

 (CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

U1010

CONTROL UNIT (CAN)

When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.

A/C auto amp.

HAC-166

< COMPONENT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

B257B, B257C AMBIENT SENSOR

B257B, B257C AMBIENT SENSOR

Description

INFOID:0000000003884740

COMPONENT DESCRIPTION

Ambient Sensor

• The ambient sensor (1) is installed behind left side of front bumper.
• It detects ambient temperature and converts it into a resistance

value which is then input into the A/C auto amp.

Ambient Sensor Circuit

AMBIENT TEMPERATURE INPUT PROCESS

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

°

C (0.6

°

F) per 100 sec-

onds.
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 ambient sensor increases. This is because the
heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.

DTC Logic

INFOID:0000000003884741

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

164, "DTC Logic"

 or 

HAC-165, "DTC Logic"

. 

• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [

−

44

°

C (

−

47

°

F)] and

adjusts the temperature control warmer. 

DTC CONFIRMATION PROCEDURE

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

JPIIA0898ZZ

JPIIA0612GB

DTC

Items

 (CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

B257B

AMB TEMP SEN (SHORT)

Detected temperature at ambient sensor 

−

44

°

C (

−

47

°

F) or less

• Ambient sensor
• A/C auto amp.
• Harness and connector

(Ambient sensor circuit is open, 
or there is a short in the circuit)

B257C

AMB TEMP SEN (OPEN)

Detected temperature at ambient sensor 
100

°

C (212

°

F) or more

B257B, B257C AMBIENT SENSOR

HAC-167

< COMPONENT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

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1.

Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2.

Check if any DTC is displayed in the self-diagnosis results. 

NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

164, "DTC Logic"

 or 

HAC-165, "DTC Logic"

. 

• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [

−

44

°

C (

−

47

°

F)] and

adjusts the temperature control warmer. 

Is DTC “B257B” or “B257C” displayed?

YES

>> Perform trouble diagnosis for the ambient sensor. Refer to 

HAC-167, "Diagnosis Procedure"

. 

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003884742

1.

CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND

1.

Disconnect ambient sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between ambient sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP. 

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK AMBIENT SENSOR

Check ambient sensor. Refer to 

HAC-168, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp.

NO

>> Replace ambient sensor.

4.

CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.

4.

Check continuity between ambient sensor harness connector and ground.

(+)

(

−

)

Voltage

Ambient sensor

—

Connector

Terminal

E337

1

Ground

Approx. 5 V

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E337

2

M50

37

Existed

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E337

1

M50

35

Existed

HAC-168

< COMPONENT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

B257B, B257C AMBIENT SENSOR

Is the inspection result normal?

YES

>> Replace A/C auto amp.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000003884743

1.

CHECK AMBIENT SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect ambient sensor connector. Refer to 

VTL-81, "Exploded View"

.

3.

Check resistance between ambient sensor terminals.

Is the inspection result normal?

YES

>> END.

NO

>> Replace ambient sensor.

Ambient sensor

—

Continuity

Connector

Terminal

E337

1

Ground

Not existed

Terminal

Condition

Resistance k

Ω

Temperature 

°

C (

°

F)

1

2

−

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