Infiniti F50. Manual — part 145
TROUBLE DIAGNOSIS
ATC-105
C
D
E
F
G
H
I
K
L
M
A
B
ATC
No A/C Display is Shown
EJS001YB
1.
CHECK CIRCUIT CONTINUITY BETWEEN AV (AND NAVI) CONTROL UNIT AND AUTO AMP.
1.
Disconnect auto amp. connector and AV and NAVI control unit
or AV control unit connector.
2.
Check continuity between AV and NAVI control unit harness
connector B29 terminals 37 (W), 39 (B) or AV control unit har-
ness connector M77 terminals 44 (W), 45 (B) and ground.
3.
Check continuity between AV and NAVI control unit harness
connector B29 terminals 37 (W), 39 (B) or AV control unit har-
ness connector M77 terminals 44 (W), 45 (B) and auto amp.
harness connector M119 terminals 9 (W), 20 (B).
OK or NG
OK
>> GO TO 2.
NG
>>
●
Check harness between auto amp. and AV and NAVI
control unit or AV control unit.
●
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 control unit harness con-
nector B29 terminals 37 (W), 39 (B) or AV control unit harness
connector M77 terminals 44 (W), 45 (B) 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. 3.5V or more
44, 45 – Ground
: Approx. 3.5V or more
RJIA1578E
ATC-106
TROUBLE DIAGNOSIS
3.
A/C–AV, AC–CLK COMMUNICATION SIGNAL CHECK
1.
Turn ignition switch OFF.
2.
Reconnect AV and NAVI control unit or AV control unit connec-
tor.
3.
Turn the ignition switch ON.
4.
Check voltage between AV and NAVI control unit harness con-
nector B29 terminals 37 (W), 39 (B) or AV control unit harness
connector M77 terminals 44 (W), 45 (B) and ground.
OK or NG
OK
>> Replace auto amp.
NG
>> Replace AV and NAVI control unit or AV control unit.
A/C Operation is not Possible.
EJS001YC
1.
CHECK CIRCUIT CONTINUITY BETWEEN AV (AND NAVI) CONTROL UNIT AND AUTO AMP.
1.
Disconnect auto amp. connector and AV and NAVI control unit
or AV control unit connector.
2.
Check continuity between AV and NAVI control unit harness
connector B29 terminals 38 (R), 39 (B) or AV control unit har-
ness connector M77 terminals 43 (R), 45 (B) and ground.
3.
Check continuity between AV and NAVI control unit harness
connector B29 terminals 38 (R), 39 (B) or AV control unit har-
ness connector M77 terminals 43 (R), 45 (B) and auto amp. har-
ness connector M119 terminals 10 (R), 20 (B).
OK or NG
OK
>> GO TO 2.
NG
>>
●
Check harness for open or short between auto amp.
and AV and NAVI control unit or AV control unit.
●
Check connector housings for disconnected or loose
terminals.
37, 39 – Ground
:
ence Value for AV and NAVI Con-
trol unit"
44, 45 – Ground
:
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-107
C
D
E
F
G
H
I
K
L
M
A
B
ATC
2.
AV–A/C, AC–CLK COMMUNICATION SIGNAL CHECK
1.
Connect auto amp. connector.
2.
Turn the ignition switch ON.
3.
Check voltage between AV and NAVI control unit harness con-
nector B29 terminal 38 (R) or AV control unit harness connector
M77 terminal 43 (R) 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.
Connect AV and NAVI control unit or AV control unit connector.
3.
Turn the ignition switch ON.
4.
Check voltage between AV and NAVI control unit harness con-
nector B29 terminals 38 (R), 39 (B) or AV control unit harness
connector M77 terminals 43 (R), 45 (B) and ground.
OK or NG
OK
>> Replace auto amp.
NG
>> Replace AV and NAVI control unit or AV control unit.
38 – Ground
: Approx. 3.5V or more
43 – Ground
: Approx. 3.5V or more
RJIA1582E
38, 39 – Ground
:
ence Value for AV and NAVI
Control unit"
43, 45 – Ground
:
ence Value for AV Control
Unit"
RJIA1583E
ATC-108
TROUBLE DIAGNOSIS
Ambient Sensor Circuit
EJS001YD
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 amplifier.
AMBIENT TEMPERATURE INPUT PROCESS
The automatic amplifier includes a processing circuit for the ambient sensor input. However, when the temper-
ature 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 cup of coffee after high speed driving. Although the actual ambient
temperature 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.
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (21 or
−
21 is
indicated on auto amp. As a result of conducting 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 (G/R) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
RJIA0243E
RHA051GA
1 – Ground
: Approx. 5V
RJIA0244E
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