2009 INFINITI QX56 200

SN-38
< ECU DIAGNOSIS >
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEM
ABNIA0086GB
Revision: December 20092009 QX56

SN
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEMSN-39
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ABNIA0087GB
Revision: December 20092009 QX56

SN-40
< ECU DIAGNOSIS >
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEM
ABNIA0088GB
Revision: December 20092009 QX56

SN
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEMSN-41
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ABNIA0089GB
Revision: December 20092009 QX56

SN-42
< ECU DIAGNOSIS >
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEM
ABNIA0090GB
Revision: December 20092009 QX56

SN
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEMSN-43
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ABNIA0091GB
Revision: December 20092009 QX56

SN-44
< ECU DIAGNOSIS >
SONAR CONTROL UNIT FOR FRONT AND REAR SONAR SYSTEM
DTC Index
INFOID:0000000003776758
DTC Malfunction Service Procedure
B2700 Front sonar sensor LH outer Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B2701 Front sonar sensor LH outer harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B2702 Front sonar sensor RH outer Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B2703 Front sonar sensor RH outer harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B2704 Rear sonar sensor LH outer Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B2705 Rear sonar sensor LH outer harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B2706 Rear sonar sensor RH outer Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B2707 Rear sonar sensor RH outer harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B2708 Rear sonar sensor LH inner Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B2709 Rear sonar sensor LH inner harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B270A Rear sonar sensor RH inner Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B270B Rear sonar sensor RH inner harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B270C Front sonar sensor LH inner Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B270D Front sonar sensor LH inner harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
B270E Front sonar sensor RH inner Replace sonar sensor. Refer to
SN-49, "
Removal and Installa-
tion".
B270F Front sonar sensor RH inner harness 1. Check harness for open or short. Refer to SN-15, "
Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Replace sonar sensor. Refer to SN-49, "
Removal and In-
stallation".
Revision: December 20092009 QX56

SN
SONAR SYSTEM SYMPTOMSSN-45
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
SONAR SYSTEM SYMPTOMS
Symptom TableINFOID:0000000003776759
Symptom Repair order
When the sonar system is OFF, the OFF indicator does not light
and the sonar buzzer does not sound. 1. Check sonar system OFF switch. Refer to
SN-20, "
Compo-
nent Inspection" or SN-19, "Diagnosis Procedure (With
Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF
switch.
3. Replace sonar control unit. Refer to SN-50, "
Removal and
Installation".
When the sonar system is OFF, the OFF indicator lamp does not
light but the sonar buzzer does sound. 1. Check sonar system OFF switch. Refer to
SN-19, "
Diagno-
sis Procedure (With Rear Sonar System)" or SN-19, "Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF indi- cator lamp.
3. Replace sonar control unit.
When the sonar system is OFF, the sonar buzzer does not sound
but the OFF indicator lamp lights. 1. Check sonar buzzer. Refer to
SN-18, "
Component Inspec-
tion" or SN-17, "Diagnosis Procedure (With Front and Rear
Sonar System)".
2. Check harness and connections between sonar buzzer and sonar control unit.
3. Replace sonar control unit.
When sonar system is ON, the sonar system OFF indicator lamp
lights up and the sonar buzzer sounds intermittently (for about 4
seconds). (Rear sonar system only) 1. Check harnesses between sonar sensors and sonar control
unit for an open condition.
2. Check sonar sensors. Refer to SN-5, "
Preliminary Check".
3. Replace sonar control unit.
The sonar system still operates when the sonar system is OFF. 1. Replace sonar control unit.
When the transmission gear selector lever is in the R position and
the sonar system is ON, the rear sonar system does not operate. 1. Check transmission range switch. Refer to
TM-44, "
Diagno-
sis Procedure".
2. Check back-up lamp relay.
3. Check related harness and connections for back-up lamp re- lay.
4. Replace sonar control unit.
When the transmission gear selector lever is in a forward drive
gear and the sonar system is ON, the front sonar system does not
operate. (With front and rear sonar system only) 1. Check harness and connections between sonar control unit
and combination meter.
2. Replace sonar control unit.
Sonar system OFF indicator lamp lights up and buzzer sounds al-
though there are no obstacles within the detection range. 1. Check sonar sensors.
2. Check harness and connections between sonar sensors
and sonar control unit.
3. Replace sonar control unit.
The sonar sensors do not detect objects in the detectable range. 1. Check sonar sensors.
2. Replace sonar control unit.
Revision: December 20092009 QX56