Nissan Quest E52. Instruction — part 82
AV
U1243 FRONT DISPLAY UNIT
AV-207
< DTC/CIRCUIT DIAGNOSIS >
[BASE AUDIO WITH SEPARATE DISPLAY]
C
D
E
F
G
H
I
J
K
L
M
B
A
O
P
U1243 FRONT DISPLAY UNIT
DTC Logic
INFOID:0000000009652035
Diagnosis Procedure
INFOID:0000000009652036
1.
CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS
Check front display unit power supply and ground circuits. Refer to
AV-213, "FRONT DISPLAY UNIT : Diagno-
Is inspection result normal?
YES
>> GO TO 2.
NO
>> Repair malfunctioning parts.
2.
CHECK CONTINUITY COMMUNICATION CIRCUITS
1.
Turn ignition switch OFF.
2.
Disconnect front display unit connector and AV control unit connector.
3.
Check continuity between front display unit harness connector and AV control unit harness connector.
4.
Check continuity between front display unit harness connector and ground.
Is inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK COMMUNICATION SIGNAL
1.
Connect front display unit connector and AV control unit connector.
2.
Turn ignition switch ON.
3.
Check signal between front display unit harness connector and ground.
DTC
Display contents of
CONSULT
DTC detection condition
Possible malfunction factor
U1243
FRONT DISP CONN
[U1243]
When either one of the following items are detected:
• front display unit power supply and ground circuits are
malfunctioning.
• serial communication circuits between front display unit
and AV control unit are malfunctioning.
• Front display unit power supply and
ground circuits.
• Serial communication circuits be-
tween front display unit and AV
control unit.
Front display unit
AV control unit
Continuity
Connector
Terminals
Connector
Terminals
M156
11
M172
51
Existed
22
39
Front display unit
Ground
Continuity
Connector
Terminals
M156
11
Not existed
12
AV-208
< DTC/CIRCUIT DIAGNOSIS >
[BASE AUDIO WITH SEPARATE DISPLAY]
U1243 FRONT DISPLAY UNIT
Is inspection result normal?
YES
>> GO TO 4.
NO
>> Replace AV control unit. Refer to
AV-250, "Removal and Installation"
.
4.
CHECK COMMUNICATION SIGNAL
Check signal between front display unit harness connector and ground.
Is inspection result normal?
YES
>> INSPECTION END
NO
>> Replace front display unit. Refer to
AV-251, "Removal and Installation"
.
Probe
Condition
Standard
Reference value
(+)
(
−
)
Front display unit
Connector
Terminal
Connector
Terminal
M156
11
M156
1
When ad-
justing dis-
play
brightness.
Waveform of 0.4 V - 5.3
V is input.
PKIB5039J
Probe
Condition
Standard
Reference value
(+)
(
−
)
Front display unit
Connector
Terminal
Connector
Terminal
M156
22
M156
1
When ad-
justing dis-
play
brightness.
Waveform of 0.5 V or
less - 3.5 V or more is in-
put.
PKIB5039J
AV
U1255 SATELLITE RADIO TUNER
AV-209
< DTC/CIRCUIT DIAGNOSIS >
[BASE AUDIO WITH SEPARATE DISPLAY]
C
D
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F
G
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M
B
A
O
P
U1255 SATELLITE RADIO TUNER
DTC Logic
INFOID:0000000009652037
Diagnosis Procedure
INFOID:0000000009652038
1.
CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuit. Refer to
AV-215, "SATELLITE RADIO TUNER :
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair malfunctioning parts.
2.
CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect AV control unit connector and satellite radio tuner connector.
3.
Check continuity between AV control unit harness connector and satellite radio tuner harness connector.
4.
Check continuity between AV control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AV CONTROL UNIT VOLTAGE
1.
Connect AV control unit connector.
2.
Turn ignition switch ON.
3.
Check signal between AV control unit harness connector and ground.
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1255
SAT CONN
[U1255]
When either one of the following items is detected:
• satellite radio tuner power supply and ground circuit are
malfunctioning.
• communication circuits between AV control unit and
satellite radio tuner are malfunctioning.
• request signal circuit between AV control unit and sat-
ellite radio tuner are malfunctioning.
• Satellite radio tuner power supply
and ground circuit.
Refer to
DIO TUNER : Diagnosis Proce-
dure"
• Communication circuit between AV
control unit and satellite radio tun-
er.
• Request signal circuit between AV
control unit and satellite radio tun-
er.
AV control unit
Satellite radio tuner
Continuity
Connector
Terminals
Connector
Terminals
M176
122
B49
10
Existed
129
8
130
9
AV control unit
Ground
Continuity
Connector
Terminals
M176
122
Not existed
129
130
AV-210
< DTC/CIRCUIT DIAGNOSIS >
[BASE AUDIO WITH SEPARATE DISPLAY]
U1255 SATELLITE RADIO TUNER
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace AV control unit. Refer to
AV-250, "Removal and Installation"
.
4.
CHECK SATELLITE RADIO TUNER VOLTAGE
1.
Turn ignition switch OFF.
2.
Disconnect AV control unit connector.
3.
Connect satellite radio tuner.
4.
Turn ignition switch ON.
5.
Check signal between satellite radio tuner harness connector and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace satellite radio tuner. Refer to
AV-264, "Removal and Installation"
(+)
(
−
)
Voltage
(Approx.)
AV control unit
Connector
Terminals
M176
129
Ground
7.0 V
130
7.0 V
(+)
(
−
)
Voltage
(Approx.)
Satellite radio tuner
Connector
Terminal
B49
10
Ground
7.0 V
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