CAN gateway INFINITI QX56 2011 Factory User Guide

LAN-76
< DTC/CIRCUIT DIAGNOSIS >[CAN]
CGW BRANCH LINE CIRCUIT (CAN
COMMUNICATION CIRCUIT 1)
CGW BRANCH LINE CIRCUIT (CAN COMMUNICATION CIRCUIT 1)
Diagnosis ProcedureINFOID:0000000006220552
1.CHECK DTC
Check DTC of the CAN gateway with CONSULT-III.
Is U1010 or B2600 indicated?
YES >> Perform a diagnosis of the indicated DTC.
NO >> GO TO 2.
2.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the CAN gateway for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair the terminal and connector.
3.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of CAN gateway.
2. Check the resistance between the CAN gateway harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 4.
NO >> Repair the CAN gateway branch line (CAN communication circuit 1). Refer to LAN-57, "
System
Diagram".
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circ uit of the CAN gateway. Refer to LAN-116, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the CAN gateway. Refer to LAN-117, "Removal and Installation".
YES (Past error)>>Error was detected in the CAN gateway branch line (CAN communication circuit 1).
NO >> Repair the power supply and the ground circuit.
CAN gateway harness connector Resistance (Ω)
Connector No. Terminal No.
M125 1 7 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
CGW BRANCH LINE CIRCUIT (CAN COMMUNICATION CIRCUIT 2)LAN-77
< DTC/CIRCUIT DIAGNOSIS > [CAN]
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CGW BRANCH LINE CI
RCUIT (CAN COMMUNICATION CIRCUIT 2)
Diagnosis ProcedureINFOID:0000000006220553
1.CHECK DTC
Check DTC of the CAN gat eway with CONSULT-III.
Is U1010 or B2600 indicated?
YES >> Perform a diagnosis of the indicated DTC.
NO >> GO TO 2.
2.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con- nector side).
- CAN gateway
- Harness connector M19
- Harness connector B2
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair the terminal and connector.
3.CHECK HARNESS CONTI NUITY (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 4.
NO >> Repair the CAN gateway branch line (CAN communication circuit 2). Refer to LAN-57, "
System
Diagram".
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the CAN gateway. Refer to LAN-116, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the CAN gateway. Refer to LAN-117, "Removal and Installation".
YES (Past error)>>Error was detected in the CAN gateway branch line (CAN communication circuit 2).
NO >> Repair the power supply and the ground circuit.
CAN gateway harness connector Continuity
Connector No. Terminal No.
M125 46Existed
10 12 Existed
Revision: 2010 May2011 QX56

LAN-84
< DTC/CIRCUIT DIAGNOSIS >[CAN]
ADP BRANCH LINE CIRCUIT
ADP BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006220560
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 fo r 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 sy stem)>>GO TO 3.
NO >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the connector of CAN gateway.
2. Check the continuity between the CA N 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 : DiagnosisProcedure".
Is the inspection result normal?
YES (Present error)>>Replace the driv er 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 46Existed
10 12 Existed
Driver seat control unit harness connector Resistance (Ω)
Connector No. Terminal No.
B451 1 17 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
PSB BRANCH LINE CIRCUITLAN-85
< DTC/CIRCUIT DIAGNOSIS > [CAN]
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PSB BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006220561
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con- nector side).
- Pre-crash seat belt control unit (driver side)
- CAN gateway
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (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.
2. Disconnect the connector of pre-crash seat belt control unit (driver side).
3. Check the resistance between the pre-crash seat bel t control unit (driver side) harness connector termi-
nals.
Is the measurement value within the specification?
YES >> GO TO 4.
NO >> Repair the pre-crash seat belt control unit (driver side) branch line.
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the pre- crash seat belt control unit (driver side). Refer to
SBC-52, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the seat belt pr e-tensioner retractor (LH side). Refer to SB-6, "SEAT BELT
RETRACTOR : Removal and Installation".
YES (Past error)>>Error was detected in the pre-cr ash seat belt control unit (driver side) branch line.
NO >> Repair the power supply and the ground circuit.
CAN gateway harness connector Continuity
Connector No. Terminal No.
M125 46Existed
10 12 Existed
Pre-crash seat belt control unit (driver side) harness connector Resistance (Ω)
Connector No. Terminal No.
B9 14 4 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN-86
< DTC/CIRCUIT DIAGNOSIS >[CAN]
E-SUS BRANCH LINE CIRCUIT
E-SUS BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006220562
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 fo r 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 sy stem)>>GO TO 3.
NO >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the connector of CAN gateway.
2. Check the continuity between the CA N 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 leveliz er 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,
"DiagnosisProcedure".
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 t he 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 46Existed
10 12 Existed
Air levelizer control mo dule harness connector
Resistance (Ω)
Connector No. Terminal No.
B84 16 7 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
ICC BRANCH LINE CIRCUITLAN-87
< DTC/CIRCUIT DIAGNOSIS > [CAN]
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ICC BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006220563
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e 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
- CAN gateway
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (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.
2. Disconnect the connector of ADAS control unit.
3. Check the resistance between the ADAS control unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 4.
NO >> Repair the ADAS control unit branch line.
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ADAS control unit. Refer to DAS-62, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES (Present error)>>Replace the ADAS control unit. Refer to DAS-63, "Removal and Installation".
YES (Past error)>>Error was detected in the ADAS control unit branch line.
NO >> Repair the power supply and the ground circuit.
CAN gateway harness connector Continuity
Connector No. Terminal No.
M125 46Existed
10 12 Existed
ADAS control unit harness connector Resistance (Ω)
Connector No. Terminal No.
B61 14 15 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN-88
< DTC/CIRCUIT DIAGNOSIS >[CAN]
PWBD BRANCH LINE CIRCUIT
PWBD BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006220564
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 fo r 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 sy stem)>>GO TO 3.
NO >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the connector of CAN gateway.
2. Check the continuity between the CA N 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 ba ck 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 t he 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 automat ic 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 46Existed
10 12 Existed
Automatic back door control module harness connector Resistance (Ω)
Connector No. Terminal No.
B26 7 6 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN-98
< DTC/CIRCUIT DIAGNOSIS >[CAN]
CAN COMMUNICATION CIRCUIT 2
CAN COMMUNICATION CIRCUIT 2
Diagnosis ProcedureINFOID:0000000006220571
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 2. NOTE:
For identification of CAN communication circuit 1, CAN communication circuit 2, and ITS communication
circuit, refer to LAN-57, "
System Diagram".
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 CONTI NUITY (SHORT CIRCUIT)
Check the continuity between t he 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 CONTI NUITY (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 CAN GATEWAY TERMINATION CIRCUIT
1. Remove the CAN gateway.
2. Check the resistance between the CAN gateway terminals.
Is the measurement value within the specification?
YES >> GO TO 5.
NO >> Replace the CAN gateway.
5.CHECK SYMPTOM
Connect all the connectors. Check if the symptoms descri bed in the “Symptom (Results from interview with
customer)” are reproduced.
Inspection result
Reproduced>>GO TO 6.
Data link connector Continuity
Connector No. Terminal No.
M4 13 12 Not existed
Data link connector
GroundContinuity
Connector No. Terminal No.
M4 13 Not existed
12 Not existed
CAN gateway
Resistance (Ω)
Te r m i n a l N o .
4 10 Approx. 108 – 132
6 12 Approx. 108 – 132
Revision: 2010 May2011 QX56

LAN
CAN COMMUNICATION CIRCUIT 2LAN-99
< DTC/CIRCUIT DIAGNOSIS > [CAN]
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Non-reproduced>>Start the diagnosis again. Follow
the trouble diagnosis procedure when past error is
detected.
6.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 cabl e from the negative terminal.
3. Disconnect one of the unit connectors of CAN communication circuit 2. NOTE:
CAN gateway has two termination circuits. 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.
Revision: 2010 May2011 QX56

LAN-102
< PRECAUTION >[CAN GATEWAY]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006238427
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
 To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Revision: 2010 May2011 QX56