Nissan Pathfinder (2012 year). Instruction — part 42
AV-154
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
U1240 SWITCH CONN
U1240 SWITCH CONN
Description
INFOID:0000000007347714
U1240 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
Self-diagnosis results display item
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1240
• SWITCH CONN
[U1240]
• A/C and AV switch assembly power supply and ground
circuit malfunction is detected
• A malfunction is detected in communication circuit be-
tween AV control unit and A/C and AV switch assembly
• A malfunction is detected in communication signal be-
tween AV control unit and A/C and AV switch assembly
• A/C and AV switch assembly power
supply and ground circuits
• Communication circuit between AV
control unit and A/C and AV switch
assembly
August 2012
2012 Pathfinder
AV
U1243 DISPLAY UNIT
AV-155
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1243 DISPLAY UNIT
Description
INFOID:0000000007347715
DTC Logic
INFOID:0000000007347716
Diagnosis Procedure
INFOID:0000000007347717
Regarding Wiring Diagram information, refer to
AV-225, "Wiring Diagram - Without Navigation System"
1.
CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. Refer to
AV-163, "DISPLAY UNIT : Diagnosis Procedure"
.
Is inspection result OK?
YES
>> GO TO 2
NO
>> Repair malfunctioning parts.
2.
CHECK CONTINUITY OF COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect display unit connector and AV control unit connector.
3. Check continuity between display unit harness connector M93
(A) terminals 11, 22 and AV control unit harness connector M45
(B) terminals 56, 44.
4. Check continuity between display unit harness connector M93
(A) terminals 11, 22 and ground.
Are continuity results as specified?
YES
>> GO TO 3
Part name
Description
DISPLAY UNIT
• Display image is controlled by the serial communication from AV control unit.
• Inputs the RGB image signal (RGB, RGB area and RGB synchronizing) from
AV control unit and the auxiliary image signal from the auxiliary input jacks.
• Outputs the synchronizing signals (HP and VP) to the AV control unit.
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1243
FRONT DISP CONN
[U1243]
• Display unit power supply and ground circuit malfunc-
tion is detected
• Malfunction is detected on communication circuit be-
tween display unit and AV control unit
• Malfunction is detected on communication signal be-
tween display unit and AV control unit
• Display unit power supply and
ground circuit
• Communication circuit between
display unit and AV control unit
A
B
Continuity
Connector
Terminal
Connector
Terminal
M93
11
M45
56
Yes
22
44
A
—
Continuity
Connector
Terminal
M93
11
Ground
No
22
ALNIA0310GB
August 2012
2012 Pathfinder
AV-156
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
U1243 DISPLAY UNIT
NO
>> Repair harness or connector.
3.
CHECK COMMUNICATION SIGNAL
1. Connect display unit connector and AV control unit connector.
2. Turn ignition switch ON.
3. Check signal between display unit harness connector M93 ter-
minal 11 and ground with an oscilliscope or CONSULT.
Are voltage readings as specified?
YES
>> GO TO 4
NO
>> Replace AV control unit. Refer to
AV-255, "Removal and Installation"
.
4.
CHECK COMMUNICATION SIGNAL
Check signal between display unit harness connector M93 terminal
22 and ground with an oscilliscope or CONSULT.
Are voltage readings as specified?
YES
>> Inspection End.
NO
>> Replace display unit. Refer to
AV-257, "Removal and Installation"
(+)
(-)
Reference signal
Connector
Terminal
M93
11
Ground
ALNIA0311GB
PKIB5039J
(+)
(-)
Reference signal
Connector
Terminal
M93
22
Ground
ALNIA0312GB
PKIB5039J
August 2012
2012 Pathfinder
AV
U1248 DVD DECK CONN
AV-157
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1248 DVD DECK CONN
Description
INFOID:0000000007347718
U1248 is indicated when a malfunction occurs in the communication signal of the DVD player. Indicated simul-
taneously, without fail, with the malfunction of control units connected to AV control unit with communication
line. Determine the possible malfunction cause from the table below.
DTC Logic
INFOID:0000000007347719
Diagnosis Procedure
INFOID:0000000007347720
1.
CHECK DVD PLAYER POWER SUPPLY AND GROUND CIRCUIT
Check DVD player power supply and ground circuit. Refer to
AV-168, "DVD PLAYER : Diagnosis Procedure"
Is inspection result OK?
YES
>> Inspection End.
NO
>> Repair malfunctioning parts.
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1248
DVD DECK CONN
[U1248]
• DVD player power supply and ground circuit
malfunction is detected
• Malfunction is detected on communication circuit
between DVD player and AV control unit
• Malfunction is detected on communication signal
between DVD player and AV control unit
• DVD player power supply and
ground circuit
• Communication circuit be-
tween DVD player and AV
control unit
August 2012
2012 Pathfinder
AV-158
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
U1255 SATELLITE RADIO TUNER
U1255 SATELLITE RADIO TUNER
Description
INFOID:0000000007347721
DTC Logic
INFOID:0000000007347722
Diagnosis Procedure
INFOID:0000000007347723
1.
CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT
Check satellite radio tuner power supply and ground circuit. Refer to
AV-166, "SATELLITE RADIO TUNER :
Is inspection result OK?
YES
>> Inspection End.
NO
>> Repair malfunctioning parts.
Part name
Description
SATELLITE RADIO TUNER
• Inputs the satellite radio signal from satellite radio antenna and outputs it to
the AV control unit.
• It is controlled with the communication (communication signal, request sig-
nal) from AV control unit.
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1255
SAT CONN
[U1255]
The satellite radio tuner power supply and ground circuit
malfunction is detected
Satellite radio tuner power supply and
ground circuit
August 2012
2012 Pathfinder
AV
U1256 HAND FREE CONN
AV-159
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1256 HAND FREE CONN
Description
INFOID:0000000007347724
U1256 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
Self-diagnosis results display item
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1256
• HAND FREE CONN
[U1256]
• Bluetooth control unit power supply and ground circuit
malfunction is detected
• A malfunction is detected in communication circuit be-
tween AV control unit and Bluetooth control unit
• A malfunction is detected in communication signal be-
tween AV control unit and Bluetooth control unit
• Bluetooth control unit power supply
and ground circuits
• Communication circuit between AV
control unit and Bluetooth control
unit
August 2012
2012 Pathfinder
AV-160
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
U1300 AV COMM CIRCUIT
U1300 AV COMM CIRCUIT
Description
INFOID:0000000007347725
U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.
Self-diagnosis results display item
DTC
Display contents of
CONSULT
DTC Detection Condition
Possible causes
U1300
U1240
• AV COMM CIRCUIT
[U1300]
• SWITCH CONN
[U1240]
• A/C and AV switch assembly power supply and ground
circuit malfunction is detected
• A malfunction is detected in communication circuit be-
tween AV control unit and A/C and AV switch assembly
• A malfunction is detected in communication signal be-
tween AV control unit and A/C and AV switch assembly
• A/C and AV switch assembly power
supply and ground circuits
• Communication circuit between AV
control unit and A/C and AV switch
assembly
August 2012
2012 Pathfinder
AV
U1310 AV CONTROL UNIT
AV-161
< DTC/CIRCUIT DIAGNOSIS >
[BOSE AUDIO WITHOUT NAVIGATION]
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U1310 AV CONTROL UNIT
Description
INFOID:0000000007347726
Replace the AV control unit if this DTC is displayed. Refer to
AV-255, "Removal and Installation"
.
DTC Logic
INFOID:0000000007347727
Part name
Description
AV CONTROL UNIT
• It is the master unit of the MULTI AV system and it is connected to each control
unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.
• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and combination meter via CAN communication to ob-
tain necessary information for the vehicle information function.
• It inputs the automatic brightness ON/OFF signals that are required for the dis-
play dimming control.
• It inputs the signals for driving status recognition (vehicle speed, reverse and
parking brake).
DTC
Display contents of
CONSULT
DTC Detection Condition
Action to take
U1310
CONTROL UNIT (AV)
[U1310]
An initial diagnosis error is detected in AV communication
circuit.
Replace AV control unit. Refer to
255, "Removal and Installation"
August 2012
2012 Pathfinder
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