2011 INFINITI QX56 ground

LAN-166
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 2)]
LANE BRANCH LINE CIRCUIT
LANE BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256309
1.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 lane camera unit for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of lane camera unit.
2. Check the resistance between the lane camera unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the lane camera unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the lane camera unit. Refer to DAS-387, "
LANE CAMERA
UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the lane camera unit. Refer to DAS-403, "Removal and Installation".
YES (Past error)>>Error was detected in the lane camera unit branch line.
NO >> Repair the power supply and the ground circuit.
Lane camera unit harness connector Resistance (Ω)
Connector No. Terminal No.
R8 4 8 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
APA BRANCH LINE CIRCUITLAN-167
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 2)]
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APA BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256310
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Check the terminals and connectors of the accelerator pedal actuator for damage, bend and loose con- nection (unit side and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of accelerator pedal actuator.
2. Check the resistance between the accelerator pedal actuator harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the accelerator pedal actuator branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the accelerator pedal actuator. Refer to DAS-195, "
ACCEL-
ERATOR PEDAL ACTUATOR : Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the accelerator pedal assembly. Refer to ACC-4, "MODELS WITH DIS-
TANCE CONTROL ASSIST SYSTEM : Removal and Installation".
YES (Past error)>>Error was detected in the accelerator pedal actuator branch line.
NO >> Repair the power supply and the ground circuit.
Accelerator pedal actuator harness connector Resistance (Ω)
Connector No. Terminal No.
E66 5 4 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN-168
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 2)]
LASER BRANCH LINE CIRCUIT
LASER BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256311
1.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 ICC s ensor for damage, bend and loose connection (unit side
and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ICC sensor.
2. Check the resistance between the ICC sensor harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the ICC sensor branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ICC sensor. Refer to CCS-158, "
ICC SENSOR : Diagno-
sis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the ICC sensor. Refer to CCS-176, "Removal and Installation".
YES (Past error)>>Error was detect ed in the ICC sensor branch line.
NO >> Repair the power supply and the ground circuit.
ICC sensor harness connector Resistance (Ω)
Connector No. Terminal No.
E65 3 6 Approx. 108 – 132
Revision: 2010 May2011 QX56

LAN
CAN COMMUNICATION CIRCUIT 1LAN-169
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 2)]
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CAN COMMUNICAT
ION CIRCUIT 1
Diagnosis ProcedureINFOID:0000000006256313
1.CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Disconnect all the unit connectors on CAN communication circuit 1. 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 CONTINUI TY (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 CONTINUI TY (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.
Data link connector
Continuity
Connector No. Terminal No.
M4 6 14 Not existed
Data link connector
GroundContinuity
Connector No. Terminal No.
M4 6 Not existed
14 Not existed
ECM Resistance (Ω)
Te r m i n a l N o .
146 151 Approx. 108 – 132
IPDM E/R Resistance (Ω)
Te r m i n a l N o .
27 26 Approx. 108 – 132
Revision: 2010 May2011 QX56

LAN
CAN COMMUNICATION CIRCUIT 2LAN-171
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 2)]
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CAN COMMUNICAT
ION CIRCUIT 2
Diagnosis ProcedureINFOID:0000000006256314
1.CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e 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 CONTINUI TY (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 CONTINUI TY (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 descr ibed 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-174
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 2)]
ITS COMMUNICATION CIRCUIT
5.CHECK HARNESS CONTI
NUITY (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 descri bed 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 term ination 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
GroundContinuity
Connector No. Terminal No.
B61 7 Not existed
8 Not existed
ADAS control unit
Resistance (Ω)
Te r m i n a l N o .
7 8 Approx. 108 – 132
ICC sensor Resistance (Ω)
Te r m i n a l N o .
3 6 Approx. 108 – 132
Revision: 2010 May2011 QX56

LAN-178
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 3)]
ECM BRANCH LINE CIRCUIT
ECM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256333
1.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 ECM for damage, bend and loose connection (unit side and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ECM.
2. Check the resistance between the ECM harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the ECM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to EC-168, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the ECM. Refer to EC-535, "Removal and Installation".
YES (Past error)>>Error was detected in the ECM branch line.
NO >> Repair the power supply and the ground circuit.
ECM harness connector Resistance (Ω)
Connector No. Terminal No.
E80 146 151 Approx. 108 – 132
Revision: 2010 May2011 QX56

LAN
4WD BRANCH LINE CIRCUITLAN-179
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 3)]
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4WD BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256334
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Check the terminals and connectors of the trans fer control unit for damage, bend and loose connection
(unit side and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of transfer control unit.
2. Check the resistance between the transfe r control unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the transfer control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the transfer control unit. Refer to DLN-93, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES (Present error)>>Replace the transfer control unit. Refer to DLN-107, "Removal and Installation".
YES (Past error)>>Error was detected in the transfer control unit branch line.
NO >> Repair the power supply and the ground circuit.
Transfer control unit harness connector Resistance (Ω)
Connector No. Terminal No.
E59 12 13 Approx. 54 – 66
Revision: 2010 May2011 QX56