Infiniti QX56 (JA60). Manual - part 872

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POWER SUPPLY AND GROUND CIRCUIT

SN-13

< 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 

SN-23, "Wiring Diagram"

.

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:0000000005146195

Regarding Wiring Diagram information, refer to 

SN-33, "Wiring Diagram"

.

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

SN-14

< 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 

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

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 

SN-23, "Wiring Diagram"

.

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 

SN-33, "Wiring Diagram"

.

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

SN-16

< 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