2009 INFINITI QX56 200

SN-14
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
Are any fuses blown?
YES >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to GI-
41, "Circuit Inspection".
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Disconnect sonar control unit connector B56.
2. Turn ignition switch ON.
3. Check voltage between sonar control unit connector B56 termi- nal 1 and ground.
Is there battery voltage?
YES >> GO TO 3.
NO >> Check harness for open between sonar control unit and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between sonar control unit connector B56 ter-
minal 4 and ground.
Is there continuity?
YES >> Inspection End.
NO >> Check harness ground circuit.
Unit Power Source FuseLocation
Sonar control unit ON or START 12
Fuse block (J/B)
51 IPDM E/R
Te r m i n a l s
Vo l ta g e
(+)
(-)
Connector Terminal
B56 1 Ground Battery voltage
AWNIA1574ZZ
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
B56 4Ground Yes
AWNIA1575ZZ
Revision: December 20092009 QX56

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SONAR SENSOR CIRCUIT INSPECTIONSN-15
< COMPONENT DIAGNOSIS >
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SONAR SENSOR CIRCUIT INSPECTION
DescriptionINFOID:0000000004173802
With power and ground supplied to the sonar sensors, the sonar sensors transmit an ultrasonic signal. This
signal is reflected back to the sensor by objec ts large enough and close enough to be detected. The sonar
sensors measure the time from the transmitted signal to the time the signal is reflected back and send this
information to the sonar control unit.
Diagnosis Procedure (With Rear Sonar System)INFOID:0000000004173803
1.CHECK REAR SONAR SENSOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connector and rear sonar sensor connectors.
3. Check continuity between sonar control unit harness connector (A) and rear sonar sensor harness connectors (B).
4. Check continuity between sonar control unit harness connector and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Diagnosis Procedure (With Front and Rear Sonar System)INFOID:0000000004173804
1.CHECK SONAR SENSOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connec tors and sonar sensor connectors.
3. Check continuity between sonar control unit harness connectors (A, B) and sonar sensor harness connectors (C).
Connector Terminal ConnectorTerminal Continuity
B24 (A) 16
C102, C103, C104, C105 (B) 1
Ye s
15 3
9, 10, 11, 12 2
AWNIA1501ZZ
ConnectorTerminalContinuity
B24 9, 10, 11, 12, 15, 16 Ground No
AWNIA1502ZZ
Connector TerminalConnectorTerminal Continuity
B56 (A) 9
C102, C103, C104, C105 (C) 1
Ye s
12
3
13, 14, 15, 16 2
B57 (B) 17
E158, E162, E1 63, E166 (C) 1
26 3
19, 20, 24, 25 2
AWNIA1543ZZ
Revision: December 20092009 QX56

SN-16
< COMPONENT DIAGNOSIS >
SONAR SENSOR CIRCUIT INSPECTION
4. Check continuity between sonar control unit harness connectors
(A, B) and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Connector TerminalContinuity
B56 (A) 9, 12, 13, 14, 15, 16 GroundNo
B57 (B) 17, 19, 20, 24, 25, 26
AWNIA1544ZZ
Revision: December 20092009 QX56

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SONAR BUZZER CIRCUIT INSPECTIONSN-17
< COMPONENT DIAGNOSIS >
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SONAR BUZZER CIRCUIT INSPECTION
DescriptionINFOID:0000000004173805
When the A/T selector lever is not it park or neutral, a stationary object will be detected by the sonar sensors
causing the front or rear sonar buzzer to sound a tone. As the vehicle moves closer to the object, the rate of
the tone will increase. When the object is very cl ose to the vehicle, the tone will sound continuously.
Diagnosis Procedure (With Rear Sonar System)INFOID:0000000004173806
1.CHECK SONAR BUZZER
Refer to SN-18, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace sonar buzzer. Refer to SN-51, "
Removal and Installation".
2.CHECK SONAR BUZZER CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connector and sonar buzzer connector.
3. Check continuity between sonar control unit harness connector (A) and sonar buzzer harness connector (B).
4. Check continuity between sonar control unit harness connector and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Diagnosis Procedure (With Front and Rear Sonar System)INFOID:0000000004173807
1.CHECK BUZZERS
Refer to SN-18, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace buzzer. Refer to SN-51, "
Removal and Installation".
2.CHECK BUZZER CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connec tors and sonar buzzer connectors.
Connector TerminalConnector Terminal Continuity
B24 (A) 3
M47 (B) 2
Ye s
71
AWNIA1576ZZ
Connector TerminalContinuity
B24 3, 7Ground No
AWNIA1504ZZ
Revision: December 20092009 QX56

SN-18
< COMPONENT DIAGNOSIS >
SONAR BUZZER CIRCUIT INSPECTION
3. Check continuity between sonar control unit harness connectors
(A, B) and sonar buzzer harness connectors (C).
4. Check continuity between sonar control unit harness connectors
(A, B) and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000004173808
SONAR BUZZER
1. Disconnect the sonar buzzer connector.
2. Check continuity between sonar buzzer terminals 1 and 2.
Connector Terminal Connector Terminal Continuity
B56 (A) 2
B166, M118 (C) 1
Ye s
6 B166 (C)
2
B57 (B) 23 M118 (C)
AWNIA1545ZZ
ConnectorTerminalContinuity
B56 (A) 2, 6
Ground No
B57 (B) 23
AWNIA1546ZZ
1 - 2 : Continuity should exist
WKIA4417E
Revision: December 20092009 QX56

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SONAR SYSTEM OFF SWITCH CIRCUIT INSPECTIONSN-19
< COMPONENT DIAGNOSIS >
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SONAR SYSTEM OFF SWITCH CIRCUIT INSPECTION
DescriptionINFOID:0000000004173809
The sonar system can be disabled by momentarily pressing the sonar system OFF switch. The sonar system
OFF indicator lamp will be illuminated when the sonar s ystem is OFF. Enabling the sonar system will cause
the sonar system OFF indicator to go out. The indica tor will flash if a malfunction exists in the system.
Diagnosis Procedure (With Rear Sonar System)INFOID:0000000004173810
1.CHECK REAR SONAR SYSTEM OFF SWITCH
Refer to SN-20, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace rear sonar system OFF switch. Refer to IP-15, "
Removal and Installation".
2.CHECK REAR SONAR SYSTEM OFF SWITCH CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connector and rear sonar system OFF switch connector.
3. Check continuity between sonar control unit harness connector (A) and rear sonar system OFF switch harness connector (B).
4. Check continuity between rear sonar system OFF switch har- ness connector and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Diagnosis Procedure (With Front and Rear Sonar System)INFOID:0000000004173811
1.CHECK SONAR SYSTEM OFF SWITCH
Refer to SN-20, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace sonar system OFF switch. Refer to IP-15, "
Removal and Installation".
2.CHECK SONAR SYSTEM OFF SWITCH CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connector and sonar system OFF switch connector.
Connector TerminalConnector Terminal Continuity
B24 (A) 4
M117 (B) 5
Ye s
13 1
AWNIA1577ZZ
ConnectorTerminalContinuity
M117 1, 5
Ground No
2, 6 Yes
AWNIA1578ZZ
Revision: December 20092009 QX56

SN-20
< COMPONENT DIAGNOSIS >
SONAR SYSTEM OFF SWITCH CIRCUIT INSPECTION
3. Check continuity between sonar control unit harness connector(A) and sonar system OFF switch harness connector (B).
4. Check continuity between sonar system OFF switch harness connector and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000004173812
SONAR SYSTEM OFF SWITCH
1. Disconnect the sonar system OFF switch connector.
2. Check continuity between the following switch terminals.
SONAR SYSTEM OFF INDICATOR
1. Disconnect the sonar system OFF switch connector.
2. Apply battery voltage to switch terminal 5.
3. Check the sonar system OFF indicator operation when switch terminal 6 is connected to battery ground.
Connector Terminal Connector Terminal Continuity
B56 (A) 5
M116 (B) 5
Ye s
11 1
ALNIA1087ZZ
ConnectorTerminalContinuity
M116 1, 5
Ground No
2, 6 Yes
ALNIA1088ZZ
Sonar system OFF switch Terminals Continuity
Depressed 1 - 2Ye s
Released No
AWNIA0181ZZ
Terminals Condition Operation
Sonar system
OFF switch 5
Battery voltage
Indicator ON
6G ro u nd
AWNIA0182ZZ
Revision: December 20092009 QX56

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SONAR CONTROL UNIT FOR REAR SONAR SYSTEMSN-21
< ECU DIAGNOSIS >
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ECU DIAGNOSIS
SONAR CONTROL UNIT FO R REAR SONAR SYSTEM
Reference ValueINFOID:0000000003776753
SONAR CONTROL UNIT TERMINAL LAYOUT
TERMINALS AND REFERENCE VA LUES FOR SONAR CONTROL UNIT
WKIA5222E
Te r m i n a l
(wire color) Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation
3 (R) Sonar buzzer return ON —0 - 12 (variable)
4 (BR/Y) Sonar system OFF
indicator output ON
Rear sonar system OFF
switch ON
0
OFF Battery voltage
5 (G/W) Reverse signal ONTransmission gear se-
lector lever
R position
Battery voltage
Transmission gear se-
lector lever Not R position
0
6 (B) Sonar control unit
ground ——
0
7 (L) Sonar buzzer drive
signal
ON
— Battery voltage
8 (G/R) Sonar control unit
power ON
— Battery voltage
9 (GR) Rear sonar sensor
signal - RH outer
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
10 (P) Rear sonar sensor
signal - LH outer
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstacles Battery voltage
11 ( O ) Rear sonar sensor
signal - LH inner
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
12 (LG) Rear sonar sensor
signal - RH inner
ON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• Distance obstacles Battery voltage
13 (LG) Rear sonar system
OFF switch signal
ONRear sonar system OFF
switch ON
0
OFF Battery voltage
Revision: December 20092009 QX56