2011 INFINITI QX56 BATTERY

LAN-202
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 4)]
ECM BRANCH LINE CIRCUIT
ECM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256373
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-203
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 4)]
C
D
E
F
G H
I
J
K L
B A
O P
N
4WD BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256374
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

LAN-204
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 4)]
ABS BRANCH LINE CIRCUIT
ABS BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256375
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 ABS act uator and electric unit (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 ABS actuat or and electric unit (control unit).
2. Check the resistance between the ABS actuator and electric unit (control unit) harness connector termi-
nals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the ABS actuator and electric unit (control unit) branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the AB S actuator and electric unit (control unit). Refer to
BRC-113, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal
and Installation".
YES (Past error)>>Error was detected in the ABS ac tuator and electric unit (control unit) branch line.
NO >> Repair the power supply and the ground circuit.
ABS actuator and electric unit (c ontrol unit) harness connector
Resistance (Ω)
Connector No. Terminal No.
E36 41 27 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
TCM BRANCH LINE CIRCUITLAN-205
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 4)]
C
D
E
F
G H
I
J
K L
B A
O P
N
TCM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256376
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).
- A/T assembly
- Harness connector F1
- Harness connector E7
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 A/T assembly.
2. Check the resistance between the A/T assembly harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the TCM branch line.
3.CHECK HARNESS FOR OPEN CIRCUIT
1. Remove the joint connector. Refer to TM-182, "
Removal and Installation".
2. Check the continuity between the A/T assembly harness connector side and the TCM harness connector
side of the joint connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace the joint connector.
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to TM-151, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the control valve & TCM. Refer to TM-182, "Removal and Installation".
YES (Past error)>>Error was detected in the TCM branch line.
NO >> Repair the power supply and the ground circuit.
A/T assembly harness connector Resistance (Ω)
Connector No. Terminal No.
F51 3 8 Approx. 54 – 66
A/T assembly harness connector side TCM harness connector side Continuity
Terminal No. Terminal No.
33Existed
88Existed
Revision: 2010 May2011 QX56

LAN-206
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 4)]
A-BAG BRANCH LINE CIRCUIT
A-BAG BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256377
WARNING:
 Before servicing, turn ignition switch OFF, disco
nnect battery negative terminal, and wait 3 minutes
or more. (To discharge backup capacitor.)
 Never use unspecified tester or other measuring device.
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 air bag diagnosis sensor unit for damage, bend and loose con-
nection (unit side and connector side).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the main harness.
2.CHECK AIR BAG DIAGNOSIS SENSOR UNIT
Check the air bag diagnosis sensor unit. Refer to SRC-36, "
Work Flow".
Is the inspection result normal?
YES >> Replace the main harness.
NO >> Replace parts whose air bag system has a malfunction.
Revision: 2010 May2011 QX56

LAN
AFS BRANCH LINE CIRCUITLAN-207
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 4)]
C
D
E
F
G H
I
J
K L
B A
O P
N
AFS BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256378
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 AFS c ontrol 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 AFS control unit.
2. Check the resistance between the AFS control unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the AFS control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circui t of the AFS control unit. Refer to EXL-84, "
AFS CONTROL
UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the AFS control unit. Refer to EXL-135, "Removal and Installation".
YES (Past error)>>Error was detected in the AFS control unit branch line.
NO >> Repair the power supply and the ground circuit.
AFS control unit harness connector Resistance (Ω)
Connector No. Terminal No.
M135 30 7 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN-208
< DTC/CIRCUIT DIAGNOSIS >[CAN SYSTEM (TYPE 4)]
AV BRANCH LINE CIRCUIT
AV BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256379
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).
- AV control unit
- Harness connector M222
- Harness connector M119
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 AV control unit.
2. Check the resistance between the AV control unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the AV control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the AV control unit. Refer to AV-161, "
AV CONTROL UNIT :
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the AV control unit. Refer to AV-212, "Removal and Installation".
YES (Past error)>>Error was detected in the AV control unit branch line.
NO >> Repair the power supply and the ground circuit.
AV control unit harness connector Resistance (Ω)
Connector No. Terminal No.
M210 90 74 Approx. 54 – 66
Revision: 2010 May2011 QX56

LAN
BCM BRANCH LINE CIRCUITLAN-209
< DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 4)]
C
D
E
F
G H
I
J
K L
B A
O P
N
BCM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000006256380
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 BC M 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 BCM.
2. Check the resistance between the BCM harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the BCM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the BCM. Refer to BCS-75, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the BCM. Refer to BCS-81, "Removal and Installation".
YES (Past error)>>Error was detected in the BCM branch line.
NO >> Repair the power supply and the ground circuit.
BCM harness connector Resistance (Ω)
Connector No. Terminal No.
M68 39 40 Approx. 54 – 66
Revision: 2010 May2011 QX56