Nissan Pathfinder (2009 year). Instruction — part 31
AV-60
< COMPONENT DIAGNOSIS >
[MID AUDIO]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000003938961
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each
control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to
LAN-58, "CAN Communication Signal Chart"
DTC Logic
INFOID:0000000003938962
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000003938963
1.
PERFORM SELF DIAGNOSTIC
1.
Turn ignition switch ON and wait for 2 seconds or more.
2.
Check “Self Diagnostic Result” of “MULTI AV”.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Refer to “LAN system”. Refer to
LAN-14, "Trouble Diagnosis Flow Chart"
NO
>> Refer to GI section. Refer to
GI-49, "Intermittent Incident"
.
DTC
Display contents of CON-
SULT-III
Diagnostic item is detected when ...
Probable malfunction location
U1000
CAN COMM CIRCUIT
When AV control unit is not transmitting or re-
ceiving CAN communication signal for 2 sec-
onds or more.
CAN communication system
2009 Pathfinder
AV
U1010 CONTROL UNIT (CAN)
AV-61
< COMPONENT DIAGNOSIS >
[MID AUDIO]
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U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000003938964
Initial diagnosis of AV control unit.
DTC Logic
INFOID:0000000003938965
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000003938966
1.
REPLACE AV CONTROL UNIT
When DTC U1010 is detected, replace AV control unit. Refer to
AV-142, "Removal and Installation"
.
>> Inspection End.
DTC
Display contents of CON-
SULT-III
Diagnostic item is detected when ...
Probable malfunction location
U1010
CONTROL UNIT (CAN)
CAN initial diagnosis malfunction is detected
AV control unit
2009 Pathfinder
AV-62
< COMPONENT DIAGNOSIS >
[MID AUDIO]
U1200 AV CONTROL UNIT
U1200 AV CONTROL UNIT
Description
INFOID:0000000003938967
Replace the AV control unit if this DTC is displayed. Refer to
AV-142, "Removal and Installation"
.
DTC Logic
INFOID:0000000003938968
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-III
DTC Detection Condition
Action to take
U1200
Control Unit
FLASH- ROM
[U1200]
An internal malfunction is detected in AV control unit
(FLASH-ROM).
Replace AV control unit. Re-
fer to
.
2009 Pathfinder
AV
U1216 AV CONTROL UNIT
AV-63
< COMPONENT DIAGNOSIS >
[MID AUDIO]
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U1216 AV CONTROL UNIT
Description
INFOID:0000000003938969
Replace the AV control unit if this DTC is displayed. Refer to
AV-142, "Removal and Installation"
.
DTC Logic
INFOID:0000000003938970
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-III
DTC Detection Condition
Action to take
U1216
CAN CONT
[U1216]
Internal malfunction of AV control unit (CAN controller) is
detected.
Replace AV control unit.
Refer to
2009 Pathfinder
AV-64
< COMPONENT DIAGNOSIS >
[MID AUDIO]
U1240 SWITCH CONN
U1240 SWITCH CONN
Description
INFOID:0000000003938971
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-III
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
2009 Pathfinder
AV
U1243 DISPLAY UNIT
AV-65
< COMPONENT DIAGNOSIS >
[MID AUDIO]
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U1243 DISPLAY UNIT
Description
INFOID:0000000003938972
DTC Logic
INFOID:0000000003938973
Diagnosis Procedure
INFOID:0000000003938974
1.
CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT
Check display unit power supply and ground circuit. Refer to
AV-72, "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
NO
>> Repair harness or connector.
3.
CHECK COMMUNICATION SIGNAL
1.
Connect display unit connector and AV control unit connector.
2.
Turn ignition switch ON.
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-III
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
2009 Pathfinder
AV-66
< COMPONENT DIAGNOSIS >
[MID AUDIO]
U1243 DISPLAY UNIT
3.
Check signal between display unit harness connector M93 ter-
minal 11 and ground with an oscilliscope or CONSULT-III.
Are voltage readings as specified?
YES
>> GO TO 4
NO
>> Replace AV control unit. Refer to
AV-142, "Removal and Installation"
.
4.
CHECK COMMUNICATION SIGNAL
Check signal between display unit harness connector M93 terminal
22 and ground with an oscilliscope or CONSULT-III.
Are voltage readings as specified?
YES
>> Inspection End.
NO
>> Replace display unit. Refer to
AV-144, "Removal and Installation"
(+)
(-)
Reference signal
Connector
Terminal
M93
11
Ground
ALNIA0311GB
PKIB5039J
(+)
(-)
Reference signal
Connector
Terminal
M93
22
Ground
ALNIA0312GB
PKIB5039J
2009 Pathfinder
AV
U1248 DVD DECK CONN
AV-67
< COMPONENT DIAGNOSIS >
[MID AUDIO]
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U1248 DVD DECK CONN
Description
INFOID:0000000003938975
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:0000000003938976
Diagnosis Procedure
INFOID:0000000003938977
1.
CHECK DVD PLAYER POWER SUPPLY AND GROUND CIRCUIT
Check DVD player power supply and ground circuit. Refer to
AV-77, "DVD PLAYER : Diagnosis Procedure"
Is inspection result OK?
YES
>> Inspection End.
NO
>> Repair malfunctioning parts.
DTC
Display contents of
CONSULT-III
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
2009 Pathfinder
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