Page 3433 of 4171

SN
FRONT AND REAR SONAR SYSTEMSN-11
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and send
this information to the sonar control unit.
FRONT SONAR SENSORS
With power and ground supplied to the front sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The front
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and send
this information to the sonar control unit.
COMBINATION METER
The combination meter provides the vehicle speed and park signals to the sonar control unit.
Component Parts LocationINFOID:0000000003776746
Front
1. Sonar control unit B56, B57 (View with luggage side finisher LH removed) 2. Back-up lamp relay M73 3. A/T assembly F9
4. Front sonar buzzer M118 5. Sonar system OFF switch M116
(with sonar system OFF indicator) 6. Rear sonar sensor LH outer C102
7. Rear sonar sensor LH inner C103 8. Rear sonar sensor RH inner C104 9. Rear sonar sensor RH outer C105
10. Front sonar sensor RH outer E166 11. Front sonar sensor RH inner E163 12. Front sonar sensor LH inner E162
13. Front sonar sensor LH outer E158 14. Combination meter M23, M24 15. Rear sonar buzzer B166
(View with back door open)
AWNIA1853ZZ
Revision: December 20092009 QX56
Page 3434 of 4171

SN-12
< FUNCTION DIAGNOSIS >
FRONT AND REAR SONAR SYSTEM
Component Description
INFOID:0000000003776747
CONSULT-III Function (SONAR)INFOID:0000000003776748
SELF DIAGNOSTIC PROCEDURE
CONSULT-III can be used to read and clear DTCs. Refer to GI-46, "Description".
SELF DIAGNOSTIC RESULTS
Refer to SN-44, "DTC Index".
Component Function
Sonar control unit Controls sonar system and provides self-diagnosis
Back-up lamp relay Provides reverse signal for sonar control unit
A/T assembly Controls back-up lamp relay
Front sonar buzzer Sounds a signal when objects are detected in the front of the vehicle
Rear sonar buzzer Sounds a signal when objects are detected in the rear of the vehicle
Sonar system OFF switch Enables the driver to turn the system off and signals a system malfunction
Front sonar sensors Senses objects in the front of the vehicle
Rear sonar sensors Senses objects in the rear of the vehicle
Combination meter Provides Park and vehicle speed signals for sonar control unit
Diagnosis mode Description
SELF-DIAG RESULTS Displays sonar control unit self-diagnosis results.
Revision: December 20092009 QX56
Page 3435 of 4171

SN
POWER SUPPLY AND GROUND CIRCUITSN-13
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure (With Rear Sonar System)INFOID:0000000004173800
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.CHECK FUSES
Check for blown rear sonar system fuses.
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.
2. Turn ignition switch ON.
3. Check voltage between sonar control unit connector B24 termi- nal 8 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 B24 ter- minal 6 and ground.
Is there continuity?
YES >> Inspection End.
NO >> Check harness ground circuit.
Diagnosis Procedure (With Front and Rear Sonar System)INFOID:0000000004173801
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.CHECK FUSES
Check for blown sonar system fuses.
Unit Power Source FuseLocation
Sonar control unit ON or START 12
Fuse block (J/B)
51 IPDM E/R
Terminals Ignition switch position
(+) (-) ON or START
Connector Terminal
B24 8 Ground Battery voltage
WKIA1145E
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
B24 6 Ground Yes
WKIA1146E
Revision: December 20092009 QX56
Page 3436 of 4171

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
Page 3437 of 4171

SN
SONAR SENSOR CIRCUIT INSPECTIONSN-15
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
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
Page 3438 of 4171
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
Page 3439 of 4171

SN
SONAR BUZZER CIRCUIT INSPECTIONSN-17
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
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
Page 3440 of 4171
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