ignition INFINITI QX56 2008 Factory Service Manual

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MAIN LINE BETWEEN AV AND DLC CIRCUITLAN-67
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MAIN LINE BETWEEN AV AND DLC CIRCUIT
Diagnosis ProcedureINFOID:0000000001282448
INSPECTION PROCEDURE
1.CHECK HARNESS CONTI
NUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Disconnect the following harness connectors.
-ECM
- AV control unit
4. Check the continuity between the AV contro l unit harness connector and the data link connector.
Is the inspection result normal?
YES (Present error)>>Check the following items again. • Decision of CAN system type.
• Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
• Procedure for detecting root cause.
YES (Past error)>>Error was detected in the main line between the AV control unit and the data link connec-
tor.
NO >> Repair the main line between the AV control unit and the data link connector.
AV control unit harness connector Data link connector
Continuity
Connector No. Terminal No.Connector No. Terminal No.
M45 96
M22 6
Existed
97 14Existed
Revision: March 2010 2008 QX56

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MAIN LINE BETWEEN DLC AND M&A CIRCUIT
MAIN LINE BETWEEN
DLC AND M&A CIRCUIT
Diagnosis ProcedureINFOID:0000000001297548
INSPECTION PROCEDURE
1.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the following harness connectors.
-ECM
- Combination meter
4. Check the continuity between the data link connector and the combination meter harness connector.
Is the inspection result normal?
YES (Present error)>>Check the following items again. • Decision of CAN system type.
• Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECUlist” included)].
• Procedure for detecting root cause.
YES (Past error)>>Error was detected in the main line between the data link connector and the combination
meter.
NO >> Repair the main line between the data link connector and the combination meter.
Data link connector Combination meter harness connector
Continuity
Connector No. Terminal No.Connector No. Terminal No.
M22 6
M24 10
Existed
14 11Existed
Revision: March 2010 2008 QX56

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MAIN LINE BETWEEN M&A AND ABS CIRCUITLAN-69
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MAIN LINE BETWEEN
M&A AND ABS CIRCUIT
Diagnosis ProcedureINFOID:0000000001297549
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector M31
- Harness connector E152
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 following harness connectors.
- Combination meter
- Harness connectors M31 and E152
2. Check the continuity between the combinati on meter harness connector and the harness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair the main line between the combination meter and the harness connector M31.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the connector of ABS actuat or and electric unit (control unit).
2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit)
harness connector.
Is the inspection result normal?
YES (Present error)>>Check the following items again. • Decision of CAN system type.
• Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
• Procedure for detecting root cause.
YES (Past error)>>Error was detected in the main line between the combination meter and the ABS actuator
and electric unit (control unit).
NO >> Repair the main line between the harness connec tor E152 and the ABS actuator and electric unit
(control unit).
Combination meter harness connector Harness connector
Continuity
Connector No. Terminal No.Connector No. Terminal No.
M24 10
M31 31G
Existed
11 42GExisted
Harness connector ABS actuator and electric unit (control unit)
harness connector Continuity
Connector No. Terminal No.Connector No. Terminal No.
E152 31G
E125 11
E x i s t e d
42G 15Existed
Revision: March 2010 2008 QX56

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ECM BRANCH LINE CIRCUIT
ECM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282416
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).
-ECM
- Harness connector E5
- Harness connector F14
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-83, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the ECM. Refer to EC-17, "Procedure After Replacing ECM".
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.
E16 9486Approx. 108 – 132
Revision: March 2010 2008 QX56

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TCM BRANCH LINE CIRCUITLAN-71
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TCM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282417
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 A/T assembly 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 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 POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to TM-92, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the control valve with TCM. Refer to TM-201, "Control Valve with TCM and A/
T Fluid Temperature Sensor 2".
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.
F9 3 8 Approx. 54 – 66
Revision: March 2010 2008 QX56

LAN-72
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LASER BRANCH LINE CIRCUIT
LASER BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282449
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-47, "
Wiring Diagram".
Is the inspection result normal?
YES (Present error)>>Replace the ICC sensor. Refer to CCS-71, "ICC Sensor".
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.
E42 23Approx. 54 – 66
Revision: March 2010 2008 QX56

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ICC BRANCH LINE CIRCUITLAN-73
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ICC BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282450
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 ICC 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 ICC unit.
2. Check the resistance between the ICC unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the ICC unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ICC unit. Refer to CCS-47, "
Wiring Diagram".
Is the inspection result normal?
YES (Present error)>>Replace the ICC unit. Refer to CCS-70, "ICC Unit".
YES (Past error)>>Error was detected in the ICC unit branch line.
NO >> Repair the power supply and the ground circuit.
ICC unit harness connector Resistance (Ω)
Connector No. Terminal No.
B13 14 5 Approx. 54 – 66
Revision: March 2010 2008 QX56

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ADP BRANCH LINE CIRCUIT
ADP BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282419
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 B200
- Harness connector B37
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 driver seat control unit.
2. Check the resistance between the driver seat control unit harness connector terminals.
Is the measurement value within the specification?
YES >> GO TO 3.
NO >> Repair the driver seat control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the driver seat control unit. Refer to ADP-44, "
DRIVER SEAT
CONTROL UNIT : DiagnosisProcedure".
Is the inspection result normal?
YES (Present error)>>Replace the driv er seat control unit. Refer to ADP-163, "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.
Driver seat control unit harness connector Resistance (Ω)
Connector No. Terminal No.
B202 319Approx. 54 – 66
Revision: March 2010 2008 QX56

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AV BRANCH LINE CIRCUITLAN-75
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AV BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282451
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 AV 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 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 circui t of the AV control unit. Refer to AV-63, "
AV CONTROL UNIT :
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the AV control unit. Refer to AV-164, "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.
M45 96 97 Approx. 54 – 66
Revision: March 2010 2008 QX56

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BCM BRANCH LINE CIRCUIT
BCM BRANCH LINE CIRCUIT
Diagnosis ProcedureINFOID:0000000001282421
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 BCM 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-32, "
Diagnosis Procedure".
Is the inspection result normal?
YES (Present error)>>Replace the BCM. Refer to BCS-55, "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.
M18 3940Approx. 54 – 66
Revision: March 2010 2008 QX56