2007 INFINITI QX56 steering

LAN-46
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
NOTE:
CAN data of the air bag diagnosis sensor unit is not used by usual service work, thus it is omitted.
TYPE 3/TYPE 4
NOTE:
Refer to LAN-37, "
Abbreviation List" for the abbreviations of the connecting units.
T: Transmit R: Receive
A/C switch/indicator signalTR
RT
1st position switch signal R T
4th position switch signal R T
Distance to empty signal R T
Fuel level low warning signal R T
Fuel level sensor signal R T
Parking brake switch signal R T
Stop lamp switch signal R T
Tow mode switch signal R T
Vehicle speed signalRR T
RRR RRR T
Steering angle sensor signalTR
ABS malfunction signal R T
ABS warning lamp signalRT
Brake pressure sensor signal R T
Brake warning lamp signalRT
SLIP indicator lamp signalRT
TCS malfunction signal R T
VDC malfunction signal R T
VDC OFF indicator lamp signal R R T
VDC operation signal R T
Front wiper stop position signal R T
High beam status signal RT
Hood switch signal R T
Low beam status signal RT
Rear window defogger control signal R R TSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
ABS
IPDM-E
Signal name/Connecting unitECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
4WD
ABS
IPDM-E
A/C compressor request signal TR
Accelerator pedal position signal T R R R R
ASCD CRUISE lamp signal T R
ASCD OD cancel request signal T R
ASCD operation signal T R
ASCD SET lamp signal T R
Battery voltage signal T R
Closed throttle position signal T R R

TROUBLE DIAGNOSIS
LAN-47
< SERVICE INFORMATION >[CAN]
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Cooling fan speed request signal TR
Engine coolant temperature signal T R R
Engine speed signal T R R R R R R R
Engine status signal T R
Fuel consumption monitor signalTR
RT
ICC steering switch signal T R
Malfunction indicator lamp signal T R
Wide open throttle position signal T R
A/T CHECK indicator lamp signal T R
A/T fluid temperature sensor signal T R
A/T position indicator lamp signal T R R R
A/T self-diagnosis signal R T
Current gear position signal T R R
Output shaft revolution signal R T R R
P range signal T R R R R
Turbine revolution signal R T R
ICC sensor signal T R
Buzzer output signalTR
TR
ICC OD cancel request signal R R T
ICC operation signal R R T
ICC system display signal T R
System setting signalTR
RT
A/C switch signal R T R
Blower fan motor switch signal R T
Day time running light request signal T R R
Door switch signal R T R R R
Front fog light request signal T R
Front wiper request signal R T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch signal R T R
Key fob door unlock signal R T
Key fob ID signal R T
Key switch signal R T
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R R
Sleep wake up signal R T R R
Theft warning horn request signal T R
Tire pressure data signal T RSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
4WD
ABS
IPDM-E

LAN-48
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
NOTE:
CAN data of the air bag diagnosis sensor unit is not used by usual service work, thus it is omitted.
Tire pressure signal T R R
Turn indicator signal T R
A/C switch/indicator signalTR
RT
1st position switch signal R T
4th position switch signal R T
Distance to empty signal R T
Fuel level low warning signal R T
Fuel level sensor signal R T
Parking brake switch signal R T
Stop lamp switch signal R T
Tow mode switch signal R T
Vehicle speed signalRR R T
RRR RRR T
Steering angle sensor signalTR
ABS malfunction signal R T
ABS warning lamp signalRT
Brake pressure sensor signal R T
Brake warning lamp signalRT
SLIP indicator lamp signalRT
TCS malfunction signal R T
VDC malfunction signal R T
VDC OFF indicator lamp signal R R T
VDC operation signal R T
Front wiper stop position signal R T
High beam status signal RT
Hood switch signal R T
Low beam status signal RT
Rear window defogger control signal R R TSignal name/Connecting unit
ECM
TCM
LASER
ICC
ADP
BCM
DISP
HVAC
M&A
STRG
4WD
ABS
IPDM-E

TROUBLE DIAGNOSIS
LAN-61
< SERVICE INFORMATION >[CAN]
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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.

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

TROUBLE DIAGNOSIS
LAN-73
< SERVICE INFORMATION >[CAN]
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2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the steering angle 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 steering angle sensor.
2. Check the resistance between the steering angle sensor harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the steering angle sensor branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the steering angle sensor. Refer to BRC-15, "
Schematic".
OK or NG
OK >> • Present error: Replace the steering angle sensor. Refer to BRC-60, "Removal and Installation".
• Past error: Error was detected in the steering angle sensor branch line.
NG >> Repair the power supply and the ground circuit.
Transfer Control Unit Branch Line CircuitINFOID:0000000003533657
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 transfer 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 transfer control unit.
2. Check the resistance between the transfer control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> 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 TF-23, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the transfer control unit. Refer to TF-115, "Removal and Installation".
• Past error: Error was detected in the transfer control unit branch line.
NG >> Repair the power supply and the ground circuit.
Steering angle sensor harness connector
Resistance (Ω)
Connector No. Terminal No.
M47 3 4 Approx. 54 – 66
Transfer control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
E142 7 8 Approx. 54 – 66

LT-70
< SERVICE INFORMATION >
LIGHTING AND TURN SIGNAL SWITCH
LIGHTING AND TURN SIGNAL SWITCH
Removal and InstallationINFOID:0000000003533419
Removal
1. Remove steering column cover.
2. While pressing tabs, pull lighting and turn signal switch toward
driver door and disconnect from the base.
Installation
Installation is in the reverse order of removal.
LKIA0013E