Infiniti QX56 (Z62). Manual - part 889

LAN

ADP BRANCH LINE CIRCUIT

LAN-133

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

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ADP BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256256

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 (unit side and con-
nector side).

-

Driver seat control unit

-

Harness connector B460

-

Harness connector B24

-

CAN gateway (With ICC system)

Is the inspection result normal?

YES (With ICC system)>>GO TO 2.
YES (Without ICC system)>>GO TO 3.
NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the connector of CAN gateway.

2.

Check the continuity between the CAN gateway harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check the harness and repair the root cause (CAN communication circuit 2). Refer to 

LAN-57,

"System Diagram"

.

3.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Connect the connector of CAN gateway. (With ICC system)

2.

Disconnect the connector of driver seat control unit.

3.

Check the resistance between the driver seat control unit harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 4.

NO

>> Repair the driver seat control unit branch line.

4.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the driver seat control unit. Refer to 

ADP-67, "DRIVER SEAT

CONTROL UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the driver seat control unit. Refer to 

ADP-135, "Removal and Installation"

.

YES (Past error)>>Error was detected in the driver seat control unit branch line.
NO

>> Repair the power supply and the ground circuit.

CAN gateway harness connector

Continuity

Connector No.

Terminal No.

M125

4

6

Existed

10

12

Existed

Driver seat control unit harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

B451

1

17

Approx. 54 – 66

LAN-134

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

E-SUS BRANCH LINE CIRCUIT

E-SUS BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256258

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 (unit side and con-
nector side).

-

Air levelizer control module

-

CAN gateway (With ICC system)

Is the inspection result normal?

YES (With ICC system)>>GO TO 2.
YES (Without ICC system)>>GO TO 3.
NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the connector of CAN gateway.

2.

Check the continuity between the CAN gateway harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check the harness and repair the root cause (CAN communication circuit 2). Refer to 

LAN-57,

"System Diagram"

.

3.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Connect the connector of CAN gateway. (With ICC system)

2.

Disconnect the connector of air levelizer control module.

3.

Check the resistance between the air levelizer control module harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 4.

NO

>> Repair the air levelizer control module branch line.

4.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the air levelizer control module. Refer to 

SCS-89,

"Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the air levelizer control module. Refer to 

SCS-94, "Removal and Installation"

.

YES (Past error)>>Error was detected in the air levelizer control module branch line.
NO

>> Repair the power supply and the ground circuit.

CAN gateway harness connector

Continuity

Connector No.

Terminal No.

M125

4

6

Existed

10

12

Existed

Air levelizer control module harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

B84

16

7

Approx. 54 – 66

LAN

PWBD BRANCH LINE CIRCUIT

LAN-135

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

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PWBD BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256260

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 (unit side and con-
nector side).

-

Automatic back door control module

-

CAN gateway (With ICC system)

Is the inspection result normal?

YES (With ICC system)>>GO TO 2.
YES (Without ICC system)>>GO TO 3.
NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.

Disconnect the connector of CAN gateway.

2.

Check the continuity between the CAN gateway harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check the harness and repair the root cause (CAN communication circuit 2). Refer to 

LAN-57,

"System Diagram"

.

3.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Connect the connector of CAN gateway. (With ICC system)

2.

Disconnect the connector of automatic back door control module.

3.

Check the resistance between the automatic back door control module harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 4.

NO

>> Repair the automatic back door control module branch line.

4.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the automatic back door control module. Refer to 

DLK-116,

"AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure"

. 

Is the inspection result normal?

YES (Present error)>>Replace  the  automatic back door control module. Refer to 

DLK-262, "Removal and

Installation"

.

YES (Past error)>>Error was detected in the automatic back door control module branch line.
NO

>> Repair the power supply and the ground circuit.

CAN gateway harness connector

Continuity

Connector No.

Terminal No.

M125

4

6

Existed

10

12

Existed

Automatic back door control module harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

B26

7

6

Approx. 54 – 66

LAN-136

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

CAN COMMUNICATION CIRCUIT

CAN COMMUNICATION CIRCUIT

Diagnosis Procedure

INFOID:0000000006256274

1.

CONNECTOR INSPECTION

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Disconnect all the unit connectors on CAN communication circuit.

4.

Check terminals and connectors for damage, bend and loose connection.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check the harness and repair the root cause.

3.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check the harness and repair the root cause.

4.

CHECK ECM AND IPDM E/R TERMINATION CIRCUIT

1.

Remove the ECM and the IPDM E/R.

2.

Check the resistance between the ECM terminals.

3.

Check the resistance between the IPDM E/R terminals.

Is the measurement value within the specification?

YES

>> GO TO 5.

NO

>> Replace the ECM and/or the IPDM E/R.

5.

CHECK SYMPTOM

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

Data link connector

Continuity

Connector No.

Terminal No.

M4

6

14

Not existed

Data link connector

Ground

Continuity

Connector No.

Terminal No.

M4

6

Not existed

14

Not existed

ECM

Resistance (

Ω

)

Terminal No.

146

151

Approx. 108 – 132

IPDM E/R

Resistance (

Ω

)

Terminal No.

27

26

Approx. 108 – 132