Infiniti Q45. Manual — part 128

TROUBLE DIAGNOSIS

ATC-107

C

D

E

F

G

H

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M

A

B

ATC

A/C Display is Malfunctioning

NJS0008T

DIAGNOSIS PROCEDURE

SYMPTOM: A/C display is not shown.

1.

CHECK CIRCUIT CONTINUITY BETWEEN AV AND NAVI C/U (AV C/U) AND AUTO AMP.

1.

Disconnect auto amp. connector and AV and NAVI C/U (AV C/U)
connector.

2.

Check continuity between AV and NAVI C/U harness connector
B29 terminals 37, 39 or AV C/U harness connector M77 termi-
nals 44, 45 and ground.

3.

Check continuity between AV and NAVI C/U harness connector
B29 terminals 37, 39 or AV C/U harness connector M77 termi-
nals 44, 45 and auto amp. harness connector M119 terminals 9,
20.

OK or NG

OK

>> GO TO 2.

NG

>>

●

Check harness between auto amp. and AV and NAVI
C/U or AV C/U.

●

Check connector housings for disconnected or loose
terminals.

2.

A/C–AV, AC–CLK COMMUNICATION SIGNAL CHECK

1.

Reconnect auto amp. connector.

2.

Turn the ignition switch ON.

3.

Check voltage between AV and NAVI C/U harness connector
B29 terminals 37, 39 or AV C/U harness connector M77 termi-
nals 44, 45 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Replace auto amp.

37, 39 – Ground

: Continuity should not exist.

44, 45 – Ground

: Continuity should not exist.

37, 44 – 9

: Continuity should exist.

39, 45 – 20

: Continuity should exist.

RJIA1576E

RJIA1577E

37, 39 – Ground

: Approx. 3.5 V or more

44, 45 – Ground

: Approx. 3.5 V or more

RJIA1578E

ATC-108

TROUBLE DIAGNOSIS

3.

A/C–AV, AC–CLK COMMUNICATION SIGNAL CHECK

1.

Turn ignition switch OFF.

2.

Reconnect AV and NAVI C/U (AV C/U) connector.

3.

Turn the ignition switch ON.

4.

Check voltage between AV and NAVI C/U harness connector
B29 terminals 37, 39 or AV C/U harness connector M77 termi-
nals 44, 45 and ground.

OK or NG

OK

>> Replace auto amp.

NG

>> Replace AV and NAVI C/U or AV C/U.

A/C Operation is Malfunctioning

NJS0008U

DIAGNOSIS PROCEDURE

SYMPTOM: A/C operation is not possible.

1.

CHECK CIRCUIT CONTINUITY BETWEEN AV AND NAVI C/U (AV C/U) AND AUTO AMP.

1.

Disconnect auto amp. connector and AV and NAVI C/U (AV C/U)
connector.

2.

Check continuity between AV and NAVI C/U harness connector
B29 terminals 38, 39 or AV C/U harness connector M77 termi-
nals 43, 45 and ground.

3.

Check continuity between AV and NAVI C/U harness connector
B29 terminals 38, 39 or AV C/U harness connector M77 termi-
nals 43, 45 and auto amp. harness connector M119 terminals
10, 20.

OK or NG

OK

>> GO TO 2.

NG

>>

●

Check harness for open or short between auto amp.
and AV and NAVI C/U or AV C/U.

●

Check connector housings for disconnected or loose
terminals.

37, 39 – Ground

:

AV-97, "Terminals and Refer-

ence Value for AV and NAVI Con-
trol Unit"

44, 45 – Ground

:

DI-120, "Terminals and Refer-

ence Value for AV Control Unit"

RJIA1580E

38, 39 – Ground

: Continuity should not exist.

43, 45 – Ground

: Continuity should not exist.

38, 43 – 10

: Continuity should exist.

39, 45 – 20

: Continuity should exist.

RJIA1579E

RJIA1581E

TROUBLE DIAGNOSIS

ATC-109

C

D

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F

G

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L

M

A

B

ATC

2.

AV–A/C, AC–CLK COMMUNICATION SIGNAL CHECK

1.

Connect auto amp. connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV and NAVI C/U harness connector
B29 terminal 38 or AV C/U harness connector M77 terminal 43
and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Replace auto amp.

3.

AV–A/C, AC–CLK COMMUNICATION SIGNAL CHECK

1.

Turn ignition switch OFF.

2.

Reconnect AV and NAVI C/U (AV C/U) connector.

3.

Turn the ignition switch ON.

4.

Check voltage between AV and NAVI C/U harness connector
B29 terminals 38, 39 or AV C/U harness connector M77 termi-
nals 43, 45 and ground.

OK or NG

OK

>> Replace auto amp.

NG

>> Replace AV and NAVI C/U or AV C/U.

38 – Ground

: Approx. 3.5 V or more

43 – Ground

: Approx. 3.5 V or more

RJIA1582E

38, 39 – Ground

:

AV-97, "Terminals and Refer-

ence Value for AV and NAVI
Control Unit"

43, 45 – Ground

:

DI-120, "Terminals and Refer-

ence Value for AV Control
Unit"

RJIA1583E

ATC-110

TROUBLE DIAGNOSIS

Ambient Sensor Circuit

NJS0008V

COMPONENT DESCRIPTION
Ambient Sensor

The ambient sensor is attached on the hood lock stay. It detects
ambient temperature and converts it into a resistance value which is
then input into the auto amp.

AMBIENT TEMPERATURE INPUT PROCESS

The auto amp. includes a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient 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 ambient sensor will increase. This is because the
heat from the engine compartment can radiate to the front grille area, location of the ambient sensor.

DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR

SYMPTOM: Ambient sensor circuit is open or shorted. (21 or

−

21 is

indicated on auto amp. as a result of performing self-diagnosis
STEP-2.)

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 E58
terminal 1 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

RJIA3201E

RHA051GA

1 – Ground

: Approx. 5 V

RJIA2017E