Infiniti QX56 (JA60). Manual — part 872
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POWER SUPPLY AND GROUND CIRCUIT
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< COMPONENT DIAGNOSIS >
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COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure (With Rear Sonar System)
INFOID:0000000005146194
Regarding Wiring Diagram information, refer to
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
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:0000000005146195
Regarding Wiring Diagram information, refer to
Unit
Power Source
Fuse
Location
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
Terminals
Continuity
(+)
(–)
Connector
Terminal
B24
6
Ground
Yes
WKIA1146E
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< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.
CHECK FUSES
Check for blown 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
.
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
Fuse
Location
Sonar control unit
ON or START
12
Fuse block (J/B)
51
IPDM E/R
Terminals
Voltage
(+)
(-)
Connector
Terminal
B56
1
Ground
Battery voltage
AWNIA1574ZZ
Terminals
Continuity
(+)
(–)
Connector
Terminal
B56
4
Ground
Yes
AWNIA1575ZZ
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SONAR SENSOR CIRCUIT INSPECTION
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< COMPONENT DIAGNOSIS >
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SONAR SENSOR CIRCUIT INSPECTION
Description
INFOID:0000000005146196
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 objects 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:0000000005146197
Regarding Wiring Diagram information, refer to
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:0000000005146198
Regarding Wiring Diagram information, refer to
1.
CHECK SONAR SENSOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connectors and sonar sensor connectors.
Connector
Terminal
Connector
Terminal
Continuity
B24 (A)
16
C102, C103, C104, C105 (B)
1
Yes
15
3
9, 10, 11, 12
2
AWNIA1501ZZ
Connector
Terminal
Continuity
B24
9, 10, 11, 12, 15, 16
Ground
No
AWNIA1502ZZ
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< COMPONENT DIAGNOSIS >
SONAR SENSOR CIRCUIT INSPECTION
3. Check continuity between sonar control unit harness connectors
(A, B) and sonar sensor 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.
Connector
Terminal
Connector
Terminal
Continuity
B56 (A)
9
C102, C103, C104, C105 (C)
1
Yes
12
3
13, 14, 15, 16
2
B57 (B)
17
E158, E162, E163, E166 (C)
1
26
3
19, 20, 24, 25
2
AWNIA1543ZZ
Connector
Terminal
Continuity
B56 (A)
9, 12, 13, 14, 15, 16
Ground
No
B57 (B)
17, 19, 20, 24, 25, 26
AWNIA1544ZZ
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