Infiniti QX56 (Z62). Manual - part 899

LAN

ITS COMMUNICATION CIRCUIT

LAN-173

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 2)]

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ITS COMMUNICATION CIRCUIT

Diagnosis Procedure

INFOID:0000000006256315

1.

CHECK CAN DIAGNOSIS

Check the CAN diagnosis results from CONSULT-III to see that the CAN communication circuit 1 and CAN
communication circuit 2 have no malfunction.
NOTE:
For identification of CAN communication circuit 1, CAN communication circuit 2, and ITS communication cir-
cuit, refer to 

LAN-57, "System Diagram"

.

Are the CAN communication 1 and CAN communication 2 circuits normal?

YES

>> GO TO 2.

NO

>> Check and repair CAN communication circuit 1 and/or CAN communication circuit 2.

2.

CONNECTOR INSPECTION

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).

-

ADAS control unit

-

Harness connector B63

-

Harness connector B239

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the terminal and connector.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the following harness connectors.

-

ADAS control unit

-

ICC sensor

2.

Check the continuity between the ADAS control unit harness connector and the ICC sensor harness con-
nector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the ADAS control unit branch line. (ITS communication circuit). Refer to 

LAN-57, "System

Diagram"

.

4.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

1.

Disconnect the following harness connectors.

-

Side radar RH

-

Side radar LH

-

Lane camera unit

-

Accelerator pedal actuator

2.

Check the continuity between the ADAS control unit harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check the harness and repair the root cause.

ADAS control unit harness connector

ICC sensor harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

B61

7

E65

3

Existed

8

6

Existed

ADAS control unit harness connector

Continuity

Connector No.

Terminal No.

B61

7

8

Not existed

LAN-174

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 2)]

ITS COMMUNICATION CIRCUIT

5.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the ADAS control unit harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Check the harness and repair the root cause.

6.

CHECK TERMINATION CIRCUIT

1.

Remove the ADAS control unit and the ICC sensor.

2.

Check the resistance between the ADAS control unit terminals.

3.

Check the resistance between the ICC sensor terminals.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace the ADAS control unit and/or the ICC sensor.

7.

CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with
customer)” are reproduced. 
Inspection result

Reproduced>>GO TO 8.
Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is

detected.

8.

CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.
1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Disconnect one of the unit connectors of ITS communication circuit.
NOTE:
ADAS control unit and ICC sensor have a termination circuit. Check other units first.

4.

Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom
(Results from interview with customer)” are reproduced. 
NOTE:
Although unit-related error symptoms occur, do not confuse them with other symptoms. 

Inspection result

Reproduced>>Connect the connector. Check other units as per the above procedure.
Non-reproduced>>Replace the unit whose connector was disconnected.

ADAS control unit harness connector

Ground

Continuity

Connector No.

Terminal No.

B61

7

Not existed

8

Not existed

ADAS control unit

Resistance (

Ω

)

Terminal No.

7

8

Approx. 108 – 132

ICC sensor

Resistance (

Ω

)

Terminal No.

3

6

Approx. 108 – 132

LAN

MAIN LINE BETWEEN ABS AND DLC CIRCUIT

LAN-175

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 3)]

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DTC/CIRCUIT DIAGNOSIS

MAIN LINE BETWEEN ABS AND DLC CIRCUIT

Diagnosis Procedure

INFOID:0000000006256326

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the following terminals and connectors for damage, bend and loose connection (connector side
and harness side).

-

Harness connector E107

-

Harness connector M82

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the following harness connectors.

-

ABS actuator and electric unit (control unit)

-

Harness connectors E107 and M82

2.

Check the continuity between the ABS actuator and electric unit (control unit) harness connector and the
harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the main line between the ABS actuator and electric unit (control unit) and the harness

connector E107.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Check the continuity between the harness connector and the data link connector.

Is the inspection result normal?

YES (Present error)>>Check CAN system type decision again.
YES (Past error)>>Error was detected in the main line between the ABS actuator and electric unit (control

unit) and the data link connector. 

NO

>> Repair the main line between the harness connector M82 and the data link connector.

ABS actuator and electric unit (control unit)

harness connector

Harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

E36

41

E107

1

Existed

27

6

Existed

Harness connector

Data link connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

M82

1

M4

6

Existed

6

14

Existed

LAN-176

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 3)]

MAIN LINE BETWEEN DLC AND E-SUS CIRCUIT

MAIN LINE BETWEEN DLC AND E-SUS CIRCUIT

Diagnosis Procedure

INFOID:0000000006256327

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the following terminals and connectors for damage, bend and loose connection (connector side
and harness side).

-

Harness connector M19

-

Harness connector B2

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the harness connectors M19 and B2.

2.

Check the continuity between the data link connector and the harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the main line between the data link connector and the harness connector M19.

3.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the connector of air levelizer control module.

2.

Check the continuity between the harness connector and the air levelizer control module harness connec-
tor.

Is the inspection result normal?

YES (Present error)>>Check CAN system type decision again.
YES (Past error)>>Error was detected in the main line between the data link connector and the air levelizer

control module. 

NO

>> Repair the main line between the harness connector B2 and the air levelizer control module.

Data link connector

Harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

M4

6

M19

29

Existed

14

30

Existed

Harness connector

Air levelizer control module harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

B2

29

B84

16

Existed

30

7

Existed