2011 INFINITI QX56 engine

BRC-152
< SYSTEM DESCRIPTION >[INTELLIGENT BRAKE ASSIST]
SYSTEM
SYSTEM
INTELLIGENT BRAKE ASSIST
INTELLIGENT BRAKE ASSIST : System DescriptionINFOID:0000000006228299
FUNCTION DESCRIPTION
Intelligent Brake Assist (IBA) syst
em warns the driver by a vehicle ahead detection indicator and chime when
there is a risk of a collision with the vehicle ahead in the traveling lane and the driver must take avoidance
action immediately. The system helps reduce the rear -end collision speed by applying the brakes when it
judges a collision can not be avoided.
CAUTION:
The IBA system is a not collision avoidance system. It is the driver ′s responsibility to stay alert, drive
safely and be in control of the vehicle at all times. As there is a performance limit, it may not provide a
warning or brake in certain conditions.
NOTE:
 The IBA system shares component parts and diagnosis wi th the Intelligent Cruise Control (ICC) system.
New parts added to the IBA system is the IBA OFF indica tor lamp in the combination meter and the IBA OFF
switch on the instrument driver lower panel.
 The ICC sensor integrated unit shares the parts with the ICC, but the IBA system will operate even when the
ICC system is turned to OFF.
OPERATION DESCRIPTION
The IBA system uses an ICC sensor located below t he front bumper to measure the distance to a vehicle
ahead. When the system judges that the distance gets shorter, the vehicle ahead detection indicator on the
combination meter blinks and the warning chime sounds.
To turn the system OFF/ON, push and hold the IBA OFF switch after starting the engine for more than 1 sec-
ond.
NOTE:
 The system ON/OFF condition will be memorized even if the ignition switch turns OFF.
 The IBA system operates under the following conditions.
- The IBA system will function when the vehicle is driv en at speeds of approximately 15 km/h (10 MPH) and
above, and when the vehicle ′s speed is approximately 15 km/h (10 MPH) faster than that of the vehicle
ahead.
Switch and Indicators
Temporary unavailable indication
1. IBA OFF switch 2. Vehicle ahead detection indicator 3. IBA OFF indicator lamp
A. Under side of Instrument lower panel
(LH) B. On the combination meter
JSFIA0445ZZ
Revision: 2010 May2011 QX56

BRC-154
< DTC/CIRCUIT DIAGNOSIS >[INTELLIGENT BRAKE ASSIST]
INTELLIGENT BRAKE ASSIST
DTC/CIRCUIT DIAGNOSIS
INTELLIGENT BRAKE ASSIST
Diagnosis ProcedureINFOID:0000000006228300
1.INTELLIGENT BRAKE ASSIST DIAGNOSIS
 The system will be cancelled automatically with a beep sound and IBA OFF indicator lamp on the combina-
tion meter will illuminate, when the system will not operate properly.
 When the IBA OFF indicator lamp continues to illumi nate even if the IBA system is turned on after the engine
restarts, perform the trouble-diagnosis.
NOTE:
IBA system automatically returns to ON, when erasing self-diagnosis result of “ICC/ADAS” with CONSULT-III.
>> Go to ICC. Refer to CCS-69, "
Work Flow".
Revision: 2010 May2011 QX56

SWITCH DOES NOT TURN ON / SWITCH DOES NOT TURN OFF
BRC-155
< SYMPTOM DIAGNOSIS > [INTELLIGENT BRAKE ASSIST]
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SYMPTOM DIAGNOSIS
SWITCH DOES NOT TURN ON / SWITCH DOES NOT TURN OFF
Symptom TableINFOID:0000000006228301
CAUTION:
Perform the self-diagnosis with CONS ULT-III before the symptom diagnosis. Perform the trouble diag-
nosis if any DTC is detected.
DescriptionINFOID:0000000006228302
IBA system does not turn ON/OFF.
 IBA OFF indicator lamp does not illuminate even if the IBA OFF switch is depressed when IBA OFF indicator
lamp is not illuminated.
 IBA OFF indicator lamp does not turn off even if t he IBA OFF switch is depressed when IBA OFF indicator
lamp is illuminated.
NOTE:
 To turn the system OFF ⇔ON, push and hold the IBA OFF switch after starting the engine for more than 1
second.
 The system ON/OFF condition will be memoriz ed even if the ignition switch turns OFF.
Diagnosis ProcedureINFOID:0000000006228303
1.PERFORM THE SELF-DIAGNOSIS
1. Perform “All DTC Reading” with CONSULT-III.
2. Check if the DTC is detected in self-diagnosis results for “ICC/ADAS” with CONSULT-III. Refer to CCS-50,
"DTC Index".
Is any DTC detected?
YES >> GO TO 6.
NO >> GO TO 2.
2.IBA OFF SWITCH INSPECTION
1. Start the engine.
2. Check that “IBA SW” operates normally in “D ATA MONITOR” for “ICC/ADAS” with CONSULT-III.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 5.
3.CHECK IBA OFF INDICATOR CIRCUIT
1. Start the engine.
2. Select the active test item “METE R LAMP” for “ICC/ADAS” with CONSULT-III.
3. Check if the IBA OFF indicator lamp illuminates when the test item is operated.
Is the inspection result normal?
YES >> Refer to CCS-69, "Work Flow".
NO >> GO TO 4.
4.CHECK DATA MONITOR OF COMBINATION METER
Check that “BA W/L” operates normally in “DATA MO NITOR” for “METER/M&A” with CONSULT-III, when the
IBA OFF switch is pushed and hold for more than 1 second.
Is the inspection result normal?
YES >> Replace the combination meter. Refer to MWI-85, "Removal and Installation".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
Symptom Inspection item/Reference page
IBA system does not turn ON/OFF IBA OFF indicator lamp is not turned
ON
⇔OFF when operating IBA OFF switch BRC-155, "
Diagnosis Procedure"
Revision: 2010 May2011 QX56

BRM-1
BODY EXTERIOR, DOORS, ROOF & VEHICLE SECURITY
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CONTENTS
BODY REPAIR
VEHICLE INFORMATION ... ..........................2
BODY EXTERIOR PAINT COLOR ................ .....2
Body Exterior Paint Color ................................. ......2
PRECAUTION ...............................................4
REPAIRING HIGH STRENGTH STEEL ......... .....4
High Strength Steel (HSS) ................................ ......4
Handling of Ultra High Strength Steel Plate Parts ......6
PREPARATION ............................................7
REPAIRING MATERIAL ................................ .....7
Foam Repair ....................................................... ......7
BODY COMPONENT PARTS .............................9
Underbody Component Parts ............................ ......9
Body Component Parts ...........................................11
Frame Component Parts .........................................13
REMOVAL AND INSTALLATION ...............15
CORROSION PROTECTION ......................... ....15
Description .......................................................... ....15
Anti-corrosive Wax ..................................................15
Undercoating ...........................................................16
Stone Guard Coat ...................................................17
Body Sealing ...........................................................18
BODY CONSTRUCTION ....................................22
Body Construction ............................................... ....22
REPLACEMENT OPERATIONS .......................24
Description ...............................................................24
Radiator Core Support .............................................26
Hoodledge ...............................................................26
Hoodledge (Partial Replacement) ...........................27
Front Pillar ...............................................................29
Center Pillar .............................................................32
Outer Sill .................................................................35
Rear Fender ............................................................39
Rear Fender Extension ............................................42
Rear Panel and Rear End Crossmember ................42
Rear Floor Rear .....................................................45
Crush Horn ..............................................................46
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .............................................
48
BODY ALIGNMENT ..........................................48
Body Center Marks ............................................ ....48
Description ...............................................................48
Engine Compartment ..............................................49
Underbody ...............................................................52
Passenger Compartment .........................................54
Rear Body ...............................................................56
LOCATION OF PLASTIC PARTS ....................58
Precautions for Plastics ...........................................58
Location of Plastic Parts ..........................................59
Revision: 2010 May2011 QX56

BRM-14
< PREPARATION >
BODY COMPONENT PARTS
NOTE:
 For the parts without a number described in the figure, it is supplied only with the assembly part that the part is included with.
 Tensile strength column shows the largest strength value of a part in the component part.
CAUTION:
If the high strength steel (ultra high strength steel) of this is broken, replace by assembly for the supply part. No. Parts name
Tensile strength
(MPa) Both sided anti-corrosive
precoated steel sections
1. Frame assembly Refer to No.2−36
2. Front bumper crossmember assembly T=1.8 mm
(0.071 in)
980
caution—
3. 2nd crossmember assembly 440 —
4. 2nd crossmember reinforcement (RH & LH) 440 —
5. 1st cab mounting bracket (RH & LH) Under 440 —
6. Front side member assembly (RH & LH) 540 —
7. Front suspension bracket assembly (RH & LH) Under 440 —
8. Engine mounting bracket assembly (RH & LH) Under 440 —
9. 2nd cab mounting bracket assembly (RH & LH) Under 440 —
10. 3way connector bracket assembly (RH & LH) Under 440 —
11. Piping bracket assembly (RH & LH) Under 440 —
12. Front bound bumper bracket assembly (RH & LH) 540 —
13. Lower front link mounting bracket assembly (RH & LH) 440 —
14. Diagonal member complete (RH & LH) 540 —
15. Rear engine mounting gusset assembly Under 440 —
16. Rear engine mounting member complete Under 440 —
17. Front fuel tank protector (RH & LH) Under 440 —
18. 3rd cab mounting bracket assembly (RH & LH) Under 440 —
19. Center side member assembly (RH & LH) 540 —
20. 6th crossmember assembly Under 440 —
21. Exhaust bracket (Front) Under 440 —
22. Fuel tank protector (RH & LH Rear) Under 440 —
23. Heat insulator bracket Under 440 —
24. Fuel tank protector assembly (RH & LH) 540 —
25. Rear suspension mounting bracket assembly (RH & LH) 540 —
26. 4th cab body mounting bracket assembly (RH & LH) Under 440 —
27. Rear brake hose bracket (RH & LH) Under 440 —
28. Rear shock absorber bracket assembly (RH & LH) 540 —
29. Rear side member assembly (RH & LH) 540 —
30. 5th cab body bracket (RH & LH) Under 440 —
31. 7th crossmember assembly Under 440 —
32. Exhaust bracket (Rear) Under 440 —
33. Spare wheel crossmember assembly Under 440 —
34. Front under cover bracket assembly Under 440 —
35. Rear end gusset (RH & LH) 440 —
36. Rear end crossmember assembly 540 —
Revision: 2010 May2011 QX56

BODY ALIGNMENTBRM-49
< SERVICE DATA AND SPECIFICATIONS (SDS)
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 When a measuring tape is used, check to be su re there is no elongation, twisting or bending.
 Measurements should be taken at the center of the mounting holes.
 An asterisk (*) following the value at the measuring poi nt indicates that the measuring point on the other side
is symmetrically the same value.
 The coordinates of the measurement points are the distances measured from the standard line of ″X ″, ″Y ″
and ″Z ″.
 ″Z ″: Imaginary base line [300 mm (11.81 in) below datum line ( ″0Z ″ at design plan)]
Engine CompartmentINFOID:0000000006248509
Measurement
Dimensions marked with ″*″ indicate symmetrically identical dimensions on both the right and left hand of the
vehicle.
1. Vehicle center 2. Front axle center 3. Imaginary base line
JSKIA0073GB
Revision: 2010 May2011 QX56

CCS-6
< PRECAUTION >[ICC]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006224261
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precautions For Harness RepairINFOID:0000000006224262
ITS communication uses a twisted pair line. Be careful when repairing it.
 Solder the repaired area and wrap tape around the soldered area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
SKIB8766E
Revision: 2010 May2011 QX56

CCS-10
< SYSTEM DESCRIPTION >[ICC]
COMPONENT PARTS
Component Description
INFOID:0000000006224266
× : Applicable
13. Steering angle sensor
Refer to BRC-10, "
Component Parts
Location"
14. ADAS control unit
Refer to DAS-13, "
Component Parts
Location"
A. Back side of engine room (RH) B. Front bumper (center) C. Upper side of brake pedal
D. Under side of inst rument lower driver
panel
Component Function
Description
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Intelligent Brake Assist (IBA)
Brake Assist (with preview function)
ADAS control unit ×××× ADAS control unit calculates a target distance between vehicles
and a target speed, based on signals received from each sensor
and switch to transmit an engine torque command value to ECM
and a brake fluid pres sure control signal to ABS actuator and
electric unit (control unit) via CAN communication
 ADAS control unit transmits buzzer output signal to combination
meter via CAN communication
ICC sensor ×××× ICC sensor detects light reflected from a vehicle ahead by irra-
diating laser forward and calculates a distance from the vehicle
ahead and a relative speed, based on the detected signal
 ICC sensor transmits the presence/absence of vehicle ahead and the distance from the vehicle to ADAS control unit via ITS
communication
ECM ×××× ECM transmits the accelerator pedal position signal, ICC brake
switch signal, stop lamp switch signal, ICC steering switch sig-
nal, etc. to ADAS control unit via CAN communication
 ECM controls the electric throttle control actuator based on the engine torque demand received from the ADAS control unit via
CAN communication
ABS actuator and electric unit
(control unit) ×××× ABS actuator and electric unit (control unit) transmits the vehicle
speed signal (wheel speed), stop lamp signal and VDC/TCS/
ABS system operation condition to ADAS control unit via CAN
communication
 ABS actuator and electric unit (control unit) controls the brake, based on a brake fluid pressure control signal received from the
ADAS control unit via CAN communication
BCM ×BCM transmits the front wiper request signal to ADAS control unit
via CAN communication
TCM ××TCM transmits the signal related to A/T control to ADAS control
unit via CAN communication
Revision: 2010 May2011 QX56