service INFINITI QX56 2007 Factory Service Manual

LAN-58
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
CAN System (Type 2)
INFOID:0000000003533634
DIAGNOSIS SHEET
PKID0652E

TROUBLE DIAGNOSIS
LAN-59
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
CAN System (Type 3)INFOID:0000000003533635
DIAGNOSIS SHEET
PKID0670E

LAN-60
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
CAN System (Type 4)
INFOID:0000000003533636
DIAGNOSIS SHEET
PKID0653E

TROUBLE DIAGNOSIS
LAN-61
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
Component Parts LocationINFOID:0000000003533637
Harness LayoutINFOID:0000000003533638
Refer to PG-39, "Harness Layout".
Malfunction Area ChartINFOID:0000000003533639
MAIN LINE
BRANCH LINE
1. ECM E16 2. IPDM E/R E122 3. ICC sensor E42
4. Display control unit M95 5. Combination meter M24 6. ABS actuator and electric unit (con-
trol unit) E125
7. BCM M18 8. Data link connector M22 9. Steering angle sensor M47
10. Driver seat control unit P2 11. ICC unit B13 12. Air bag diagnosis sensor unit M35
13. A/T assembly F9 14. Front air control M50 15. Transfer control unit E142
BKIA0189E
Malfunction Area Reference
Main line between TCM and driver seat control unitLAN-62, "
Main Line Between TCM and Driver Seat Control Unit"
Main line between TCM and ICC sensorLAN-63, "Main Line Between TCM and ICC Sensor"
Main line between ICC sensor and ICC unitLAN-64, "Main Line Between ICC Sensor and ICC Unit"
Main line between ICC unit and driver seat control unitLAN-65, "Main Line Between ICC Unit and Driver Seat Control
Unit"
Main line between driver seat control unit and data link connectorLAN-65, "Main Line Between Driver Seat Control Unit and Data
Link Connector"
Main line between data link connector and ABS actuator and
electric unit (control unit)LAN-66, "Main Line Between Data Link Connector and ABS Ac-
tuator and Electric Unit (Control Unit)"
Malfunction Area Reference
ECM branch line circuit LAN-67, "
ECM Branch Line Circuit"
TCM branch line circuit LAN-67, "TCM Branch Line Circuit"
ICC sensor branch line circuit LAN-68, "ICC Sensor Branch Line Circuit"
ICC unit branch line circuit LAN-69, "ICC Unit Branch Line Circuit"
Driver seat control unit branch line circuitLAN-69, "Driver Seat Control Unit Branch Line Circuit"

LAN-62
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
SHORT CIRCUIT
Main Line Between TCM and Driver Seat Control UnitINFOID:0000000003533640
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector F14
- Harness connector E5
- Harness connector E34
- Harness connector B40
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of A/T assembly and the harness connectors F14 and E5.
2. Check the continuity between the A/T assembly harness connector and the harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the A/T assembly and the harness connector F14.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors E34 and B40.
2. Check the continuity between harness connectors.
BCM branch line circuit LAN-70, "BCM Branch Line Circuit"
Display control unit branch line circuit LAN-70, "Display Control Unit Branch Line Circuit"
Data link connector branch line circuit LAN-71, "Data Link Connector Branch Line Circuit"
Front air control branch line circuitLAN-71, "Front Air Control Branch Line Circuit"
Combination meter branch line circuit LAN-72, "Combination Meter Branch Line Circuit"
Steering angle sensor branch line circuit LAN-72, "Steering Angle Sensor Branch Line Circuit"
Transfer control unit branch line circuitLAN-73, "Transfer Control Unit Branch Line Circuit"
ABS actuator and electric unit (control unit) branch line circuit LAN-74, "ABS Actuator and Electric Unit (Control Unit) Branch
Line Circuit"
IPDM E/R branch line circuit LAN-74, "IPDM E/R Branch Line Circuit"
Malfunction Area Reference
Malfunction Area Reference
CAN communication circuitLAN-75, "
CAN Communication Circuit"
A/T assembly harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
F93
F145Yes
815Yes
Harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.

TROUBLE DIAGNOSIS
LAN-63
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
OK or NG
OK >> GO TO 4.
NG >> Repair the main line between the harness connectors E5 and E34.
4.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors B37 and P1.
2. Check the continuity between harness connectors.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the TCM and the driver seat control unit.
NG >> Repair the main line between the harness connectors B40 and B37.
Main Line Between TCM and ICC SensorINFOID:0000000003533641
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector F14
- Harness connector E5
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of A/T assembly and the harness connectors F14 and E5.
2. Check the continuity between the A/T assembly harness connector and the harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the A/T assembly and the harness connector F14.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of ICC sensor.
2. Check the continuity between the harness connector and the ICC sensor harness connector.
E55
E3424 Yes
15 23 Yes
Harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
B4024
B3715 Yes
23 14 Yes
A/T assembly harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
F93
F145Yes
815Yes

LAN-64
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the TCM and the ICC sensor.
NG >> Repair the main line between the harness connector E5 and the ICC sensor.
Main Line Between ICC Sensor and ICC UnitINFOID:0000000003533642
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector E34
- Harness connector B40
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of ICC sensor and the harness connectors E34 and B40.
2. Check the continuity between the ICC sensor harness connector and the harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the ICC sensor and the harness connector E34.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of ICC unit.
2. Check the continuity between the harness connector and the ICC unit harness connector.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
Harness connector ICC sensor harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
E55
E422Yes
15 3 Yes
ICC sensor harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
E422
E3424 Yes
323Yes
Harness connector ICC unit harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
B4024
B1314 Yes
23 5 Yes

TROUBLE DIAGNOSIS
LAN-65
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the ICC sensor and the ICC unit.
NG >> Repair the main line between the harness connector B40 and the ICC unit.
Main Line Between ICC Unit and Driver Seat Control UnitINFOID:0000000003533643
INSPECTION PROCEDURE
1.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the following harness connectors.
- ECM harness connector
- ICC unit harness connector
- Harness connectors B37 and P1
4. Check continuity between the ICC unit harness connector and the harness connector.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the ICC unit and the driver seat control
unit.
NG >> Repair the main line between the ICC unit and the harness connector B37.
Main Line Between Driver Seat Control Unit and Data Link ConnectorINFOID:0000000003533644
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector B69
- Harness connector M40
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the following harness connectors.
- Harness connectors P1 and B37
- Harness connectors B69 and M40
2. Check the continuity between harness connectors.
ICC unit harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
B1314
B3715 Yes
514Yes
Harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.

LAN-66
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the harness connectors B37 and B69.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
Check the continuity between the harness connector and the data link connector.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the driver seat control unit and the data
link connector.
NG >> Repair the main line between the harness connector M40 and the data link connector.
Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control
Unit)
INFOID:0000000003533645
INSPECTION PROCEDURE
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 (connector side
and harness side).
- Harness connector M31
- Harness connector E152
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors M31 and E152.
2. Check the continuity between the data link connector and the harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the data link connector and the harness connector M31.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of ABS actuator and electric unit (control unit).
B3715
B6951J Yes
14 52J Yes
Harness connector Data link connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M4051J
M226Yes
52J 14 Yes
Data link connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M226
M3131G Yes
14 42G Yes

TROUBLE DIAGNOSIS
LAN-67
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit)
harness connector.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the data link connector and the ABS
actuator and electric unit (control unit).
NG >> Repair the main line between the harness connector E152 and the ABS actuator and electric unit
(control unit).
ECM Branch Line CircuitINFOID:0000000003533646
INSPECTION PROCEDURE
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).
- ECM connector
- Harness connector E5
- Harness connector F14
OK or NG
OK >> GO TO 2.
NG >> 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.
OK or NG
OK >> GO TO 3.
NG >> 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-101, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the ECM. Refer to EC-77, "Procedure After Replacing ECM".
• Past error: Error was detected in the ECM branch line.
NG >> Repair the power supply and the ground circuit.
TCM Branch Line CircuitINFOID:0000000003533647
INSPECTION PROCEDURE
Harness connectorABS actuator and electric unit (control unit)
harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
E15231G
E12511 Ye s
42G 15 Yes
ECM harness connector
Resistance (Ω)
Connector No. Terminal No.
E16 94 86 Approx. 108 – 132