2007 INFINITI QX56 ignition

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

LAN-68
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
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 A/T assembly for damage, bend and loose connection (unit
side and connector side).
OK or NG
OK >> GO TO 2.
NG >> 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.
OK or NG
OK >> GO TO 3.
NG >> 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 AT-51, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the TCM.
• Past error: Error was detected in the TCM branch line.
NG >> Repair the power supply and the ground circuit.
ICC Sensor Branch Line CircuitINFOID:0000000003533648
INSPECTION PROCEDURE
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 sensor for damage, bend and loose connection (unit side
and connector side).
OK or NG
OK >> GO TO 2.
NG >> 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.
OK or NG
OK >> GO TO 3.
NG >> 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 ACS-19, "
Schematic".
OK or NG
OK >> • Present error: Replace the ICC sensor. Refer to ACS-55, "ICC Sensor".
A/T assembly harness connector
Resistance (Ω)
Connector No. Terminal No.
F9 3 8 Approx. 54 – 66
ICC sensor harness connector
Resistance (Ω)
Connector No. Terminal No.
E42 2 3 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-69
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
• Past error: Error was detected in the ICC sensor branch line.
NG >> Repair the power supply and the ground circuit.
ICC Unit Branch Line CircuitINFOID:0000000003533649
INSPECTION PROCEDURE
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 unit for damage, bend and loose connection (unit side and
connector side).
OK or NG
OK >> GO TO 2.
NG >> 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.
OK or NG
OK >> GO TO 3.
NG >> 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 ACS-19, "
Schematic".
OK or NG
OK >> • Present error: Replace the ICC unit. Refer to ACS-55, "ICC Unit".
• Past error: Error was detected in the ICC unit branch line.
NG >> Repair the power supply and the ground circuit.
Driver Seat Control Unit Branch Line CircuitINFOID:0000000003533650
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).
- Driver seat control unit connector
- Harness connector P1
- Harness connector B37
OK or NG
OK >> GO TO 2.
NG >> 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.
ICC unit harness connector
Resistance (Ω)
Connector No. Terminal No.
B13 14 5 Approx. 54 – 66
Driver seat control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
P2 3 19 Approx. 54 – 66

LAN-70
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
OK or NG
OK >> GO TO 3.
NG >> 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 SE-13, "
Schematic".
OK or NG
OK >> • Present error: Replace the driver seat control unit. Refer to SE-74, "Removal and Installation".
• Past error: Error was detected in the driver seat control unit branch line.
NG >> Repair the power supply and the ground circuit.
BCM Branch Line CircuitINFOID:0000000003533651
INSPECTION PROCEDURE
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).
OK or NG
OK >> GO TO 2.
NG >> 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.
OK or NG
OK >> GO TO 3.
NG >> 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-8, "
Schematic".
OK or NG
OK >> • Present error: Replace the BCM. Refer to BCS-24, "BCM".
• Past error: Error was detected in the BCM branch line.
NG >> Repair the power supply and the ground circuit.
Display Control Unit Branch Line CircuitINFOID:0000000003533652
INSPECTION PROCEDURE
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 display control unit for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of display control unit.
BCM harness connector
Resistance (Ω)
Connector No. Terminal No.
M18 39 40 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-71
< SERVICE INFORMATION >[CAN]
C
D
E
F
G
H
I
J
L
MA
B
LAN
N
O
P
2. Check the resistance between the display control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the display control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the display control unit. Refer to AV-85, "
Schematic".
OK or NG
OK >> • Present error: Replace the display control unit. Refer to AV-145, "Removal and Installation".
• Past error: Error was detected in the display control unit branch line.
NG >> Repair the power supply and the ground circuit.
Data Link Connector Branch Line CircuitINFOID:0000000003533653
INSPECTION PROCEDURE
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 data link connector for damage, bend and loose connection
(connector side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
Check the resistance between the data link connector terminals.
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 data link connector branch line circuit.
NG >> Repair the data link connector branch line.
Front Air Control Branch Line CircuitINFOID:0000000003533654
INSPECTION PROCEDURE
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 front air control for damage, bend and loose connection (unit
side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
Display control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
M95 25 26 Approx. 54 – 66
Data link connector
Resistance (Ω)
Connector No. Terminal No.
M22 6 14 Approx. 54 – 66

LAN-72
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of front air control.
2. Check the resistance between the front air control harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the front air control branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the front air control. Refer to ATC-36, "
Schematic".
OK or NG
OK >> • Present error: Replace the front air control. Refer to ATC-123, "Removal and Installation".
• Past error: Error was detected in the front air control branch line.
NG >> Repair the power supply and the ground circuit.
Combination Meter Branch Line CircuitINFOID:0000000003533655
INSPECTION PROCEDURE
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 combination meter for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of combination meter.
2. Check the resistance between the combination meter harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the combination meter branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the combination meter. Refer to DI-9, "
Wiring Diagram -
METER -".
OK or NG
OK >> • Present error: Replace the combination meter. Refer to IP-10, "Removal and Installation".
• Past error: Error was detected in the combination meter branch line.
NG >> Repair the power supply and the ground circuit.
Steering Angle Sensor Branch Line CircuitINFOID:0000000003533656
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
Front air control harness connector
Resistance (Ω)
Connector No. Terminal No.
M50 34 35 Approx. 54 – 66
Combination meter harness connector
Resistance (Ω)
Connector No. Terminal No.
M24 11 12 Approx. 54 – 66