2011 INFINITI QX56 cruise control

CCS-80
< BASIC INSPECTION >[ICC]
ACTION TEST
11 .CHECK FOR RESTORING SPEED THAT IS SET BY
VEHICLE-TO-VEHICLE DISTANCE CONTROL
MODE BEFORE CANCELLATION
Check that the vehicle restores the previous speed kept before the syst em deactivation when performing the
following operations.
 Drive the vehicle when the vehicle-to-vehicle dist ance control mode is set and depress the brake pedal to
cancel the control. Check that the vehicle restores the previous vehicle speed kept before the system deac-
tivation when pushing up the RESUME/ACCELERATE switch.
 Drive the vehicle when the vehicle-to-vehicle distance c ontrol mode is set and shift the selector lever to the
“N” position to cancel the control. Check that the vehi cle restores the previous vehicle speed kept before the
system deactivation when shifting the selector lever to the “D” position and pushing up the RESUME/
ACCELERATE switch.
 Drive the vehicle when the vehicle-to-vehicle distanc e control mode is set and press the CANCEL switch to
cancel the control. Check that the vehicle restores the previous vehicle speed kept before the system deac-
tivation when pushing up the RESUME/ACCELERATE switch.
>> INSPECTION END
Work Procedure [Conventional (Fix ed Speed) Cruise Control Mode]INFOID:0000000006224299
NOTE:
The running speed can be set between 40 km/h (25 MPH) and 144 km/h (90 MPH).
CAUTION:
Never set the cruise speed exceed ing the posted speed limit.
1.CHECK FOR MAIN SWITCH
1. Start the engine.
2. Press the MAIN switch (1) (1.5 seconds or more).
3. Check that the ICC system display on the information display turns on and the display is ready for activa-
tion.
4. Press the MAIN switch, and check that the ICC system display on the information display turns OFF when
the ICC system is deactivated.
5. Check that the ICC system display on the informat ion display turns OFF after starting the engine again.
>> GO TO 2.
2.CHECK FOR RESUME/ACCELERATE, SE T/COAST, AND CANCEL SWITCHES
1. Check that RESUME/ACCELE RATE, SET/COAST, CANCEL switches are operated smoothly.
2. Check that switches come up as hand is released from the switches.
>> GO TO 3.
3.SET CHECKING
1. Start the engine.
2. Press the MAIN switch (1.5 seconds or more) and tu rn the conventional (fixed speed) cruise control mode
to ON.
3. Drive the vehicle at 40 km/h (25 MPH) or more.
4. Push down the SET/COAST switch.
Information display status
MAIN switch indicator (2) : ON
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Revision: 2010 May2011 QX56

CCS
ACTION TESTCCS-81
< BASIC INSPECTION > [ICC]
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5. Check that the desired speed is set and conventional (fixed speed) cruise control mode control starts
when releasing SET/COAST switch.
NOTE:
 The set vehicle speed is not displayed in the ICC system display on the information display.
 Display the set status in the ICC syst em display on the information display.
>> GO TO 4.
4.CHECK FOR INCREASE OF CRUISING SPEED
1. Set the vehicle speed to any desired speed, and drive the vehicle.
2. Check that the set speed increases by 1.6 km/h (1 MPH) as RESUME/ACCELERATE switch is pushed
up.
NOTE:
 The maximum set speed is 144 km/h (90 MPH).
 The set vehicle speed increases while pushing up the RESUME/ACCELERATE switch.
CAUTION:
Never set the cruise speed exceed ing the posted speed limit.
>> GO TO 5.
5.CHECK FOR DECREASE OF CRUISING SPEED
1. Set the vehicle speed to any desired speed, and drive the vehicle.
2. Check that the set speed decreases by 1.6 km/h (1 MPH) as SET/COAST switch is pushed down.
NOTE:
 The minimum set speed is 40 km/h (25 MPH).
 The set vehicle speed decreases while pressing down the SET/COAST switch.
 Cancel the control automatically when the vehicle speed lowers to less than approximately 32 km/h (20
MPH).
>> GO TO 6.
6.CHECK FOR CANCELLATION OF CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE
Check that the conventional (fixed speed) cruise c ontrol mode is canceled when performing the following
operations.
 When the brake pedal is depressed after the conventional (fixed speed) cruise control mode is set and the
vehicle is driven.
 When the selector lever is in the “N” position after t he conventional (fixed speed) cruise control mode is set
and the vehicle is driven.
 When the MAIN switch is turned OFF after the convent ional (fixed speed) cruise control mode is set and the
vehicle is driven.
 When the CANCEL switch is pressed after the conventi onal (fixed speed) cruise control mode is set and the
vehicle is driven.
>> GO TO 7.
7.CHECK FOR RESTORING SPEED THAT IS SET BY CONVENTIONAL (FIXED SPEED) CRUISE CON-
TROL MODE BEFORE CANCELLATION
Check that the vehicle restores the previous s peed kept before the system deactivation when performing the
following operations.
 Drive the vehicle when the conventional (fixed speed) cruise control mode is set and depress the brake
pedal to cancel the control. Check that the vehicle re stores the previous vehicle speed kept before the sys-
tem deactivation when pushing up the RESUME/ACCELERA TE switch at the vehicle speed approximately
40 km/h (25 MPH) or more.
 Drive the vehicle when the conventional (fixed speed) cr uise control mode is set and shift the selector lever
is in the “N” position to cancel the control. Check t hat the vehicle restores the previous vehicle speed kept
before the system deactivation when shifting the select or lever is in the “D” position and pushing up the
RESUME/ACCELERATE switch at the vehicle speed of approximately 40 km/h (25 MPH) or more.
 Drive the vehicle when the conventional (fixed speed) cruise control mode is set and press the CANCEL
switch to cancel the control. Check that the vehicle restores the previous vehicle speed kept before the sys-
Revision: 2010 May2011 QX56

CCS-160
< SYMPTOM DIAGNOSIS >[ICC]
INTELLIGENT CRUISE CONT
ROL SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
INTELLIGENT CRUISE CONTROL SYSTEM SYMPTOMS
Symptom TableINFOID:0000000006224440
Symptoms Reference page
Operation MAIN switch does not turn ON
Refer to CCS-161, "
Description"MAIN switch does not turn OFF
ICC system cannot be set (MAIN switch turns
ON/OFF) Refer to
CCS-162, "
Description"
CANCEL switch does not function
Refer to CCS-164, "
Description"
Resume does not function
Set speed does not increase
Set distance to a vehicle ahead cannot be
changed
ICC is not canceled when the A/T selector lever
is “N” position Refer to
CCS-165, "
Description"
Display/Chime ICC system display not appear Refer to
MWI-29, "On Board Diagnosis Function"
Chime does not sound Refer to CCS-166, "Description"
Control Driving force is hunting Refer to CCS-168, "Description"
Function to detect
a vehicle aheadSystem frequently cannot detect a vehicle ahead
Refer to CCS-169, "
Description"Distance to detect a vehicle ahead is short
System misidentifies a vehicle even though there
is no vehicle ahead  Adjust laser beam aiming: Refer to
CCS-72, "
Descrip-
tion"
 Perform ICC system action test. Refer to CCS-77, "
De-
scription"System misidentifies a vehicle in the next lane
System does not detect a vehicle at all Refer to CCS-171, "
Description"
Revision: 2010 May2011 QX56

CCS
NORMAL OPERATING CONDITIONCCS-175
< SYMPTOM DIAGNOSIS > [ICC]
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 When driving on the freeway at a set speed and approaching a slower traveling vehicle ahead, the ICC will adjust the speed to
maintain the distance, selected by the driver, from the vehicle
ahead. If the vehicle ahead changes lanes or exits the freeway, the
ICC system will accelerate and maintain the speed up to the set
speed. Pay attention to the driving operation to maintain control of
the vehicle as it accelerates to the set speed. The vehicle may not
maintain the set speed on winding or hilly roads. If this occurs, the
driver will have to manually control the vehicle speed.
 The sensor sensitivity can be affected by vehicle oper ation (steering maneuver or driving position in the
lane) or traffic or vehicle condition (for exampl e, if a vehicle is being driven with some damage).
 Normally when controlling the distance to a vehicle ahead, this system automatically accelerates or deceler-
ates own vehicle according to the speed of the vehi cle ahead. Depress the accelerator to properly acceler-
ate own vehicle when acceleration is required for a lane change. Depress the brake pedal when
deceleration is required to maintain a safe distance to the vehicle ahead due to its sudden braking or if a
vehicle cuts in. Always stay alert when using the ICC system.
PRECAUTIONS FOR CONVENTIONAL (F IXED SPEED) CRUISE CONTROL MODE
 In the conventional (fixed speed) cruise control mode, a warning chime does not sound to warn the driver if
own vehicle is too close to the vehicle ahead, as nei ther the presence of the vehicle ahead nor the vehicle-
to-vehicle distance is detected.
 Pay special attention to the distance between own v ehicle and the vehicle ahead or a collision could occur.
 Always confirm the setting in the ICC system display.
 Do not use the conventional (fixed speed) cruise c ontrol mode when driving under the following conditions:
- When it is not possible to keep the vehicle at a set speed.
- In heavy traffic or in traffic that varies in speed.
- On winding or hilly roads.
- On slippery roads (rain, snow, ice, etc.).
- In very windy areas.
 Doing so could cause a loss of vehicle control and result in an accident.
 To avoid accidentally engaging cruise control, make sure to the MAIN switch OFF when not using ICC sys- tem.
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Revision: 2010 May2011 QX56

DAS-1
CRUISE CONTROL & DRIVER ASSISTANCE
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SECTION DAS
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CONTENTS
DRIVER ASSISTANCE SYSTEM
ADAS CONTROL UNIT
PRECAUTION ................ ..............................
12
PRECAUTIONS .............................................. ....12
Precautions For Harness Repair ......................... ....12
SYSTEM DESCRIPTION .............................13
COMPONENT PARTS ................................... ....13
Component Parts Location .................................. ....13
Component Description ...........................................13
SYSTEM .............................................................14
System Description ............................................. ....14
Fail-safe ..................................................................18
DIAGNOSIS SYSTEM (ADAS CONTROL
UNIT) ..................................................................
20
On Board Diagnosis Function ............................. ....20
CONSULT-III Function (ICC/ADAS) ........................21
ECU DIAGNOSIS INFORMATION ..............31
ADAS CONTROL UNIT .................................. ....31
Reference Value ................................................. ....31
Fail-safe ..................................................................36
DTC Inspection Priority Chart .................................37
DTC Index ...............................................................38
WIRING DIAGRAM ......................................42
DRIVER ASSISTANCE SYSTEMS ................ ....42
Wiring Diagram ................................................... ....42
DTC/CIRCUIT DIAGNOSIS .........................57
C1A00 CONTROL UNIT ................................. ....57
DTC Logic ........................................................... ....57
Diagnosis Procedure ...............................................57
C1A01 POWER SUPPLY CIRCUIT 1, C1A02
POWER SUPPLY CIRCUIT 2 ............................
58
DTC Logic ............................................................ ....58
Diagnosis Procedure ...............................................58
U1000 CAN COMM CIRCUIT ...........................59
Description ...............................................................59
DTC Logic ................................................................59
Diagnosis Procedure ...............................................59
U1010 CONTROL UNIT (CAN) .........................60
Description ...............................................................60
DTC Logic ................................................................60
Diagnosis Procedure ...............................................60
U150F AV CAN 3 ..............................................61
DTC Logic ................................................................61
Diagnosis Procedure ...............................................61
POWER SUPPLY AND GROUND CIRCUIT ....62
Diagnosis Procedure ...............................................62
REMOVAL AND INSTALLATION ...............63
ADAS CONTROL UNIT ....................................63
Removal and Installation ..................................... ....63
DCA
PRECAUTION ............... ...............................
64
PRECAUTIONS .................................................64
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
64
Precautions For Harness Repair .............................64
DCA System Service ...............................................65
SYSTEM DESCRIPTION .............................66
COMPONENT PARTS ......................................66
Component Parts Location .................................. ....66
Component Description ...........................................67
SYSTEM ............................................................68
System Description .............................................. ....68
Revision: 2010 May2011 QX56

DAS-16
< SYSTEM DESCRIPTION >[ADAS CONTROL UNIT]
SYSTEM
Output Signal Item
AV control unitCAN com-
munica-
tionSystem selection signal
Receives a selection state of each item in “Driver Assis-
tance” selected with the navigation system
A/C auto amp. CAN com-
munica-
tion
Ambient temperature signal Receives ambient temperature signal
Transfer control
unit CAN com-
munica-
tion
Current 4WD mode signal Receives a mode selection state of the 4WD shift switch
ICC sensor ITS com-
munica-
tionICC sensor signal
Receives detection results, such as the presence or ab-
sence of a vehicle ahead and distance from the vehicle
Lane camera
unit ITS com-
munica-
tion
Detected lane condition signal Receives detection results of lane marker
Accelerator
pedal actuator ITS com-
munica-
tionAccelerator pedal actuator operation status
signal
Receives an operational state of accelerator pedal ac-
tuator
Side radar LH,
RH ITS com-
munica-
tion
Vehicle detection signal Receives vehicle detection condition of detection zone
IBA OFF switch IBA OFF switch signal Receives an ON/OFF state of the IBA OFF switch
Warning sys-
tems switch Warning systems switch signal
Receives an ON/OFF state of the warning systems
switch
Transmit unit Signal name Description
Reception unit Signal name Description
ECM CAN commu-
nicationICC operation signal Transmits an ICC operation signal necessary for intel-
ligent cruise control
TCM CAN commu-
nication
ICC operation signal Transmits an ICC operation signal necessary for intel-
ligent cruise control via ECM
ABS actuator
and electric
unit (control
unit) CAN commu-
nication
Brake fluid pressure control signal
Transmits a brake fluid pressure control signal to acti-
vates the brake
Target yaw moment signal Transmits a target yaw moment signal to generate
yaw moment to the vehicle
Revision: 2010 May2011 QX56

DAS-18
< SYSTEM DESCRIPTION >[ADAS CONTROL UNIT]
SYSTEM
DESCRIPTION
ADAS* control unit controls the following systems,
based on ITS communication signals from the ICC sen-
sor, the accelerator pedal actuator, the lane camera unit and side radar LH/RH and a CAN communication
signal from each control unit.
NOTE:
*: Advanced Driver Assistance Systems
- Intelligent Cruise Control (ICC)
- Distance Control Assist (DCA)
- Intelligent Brake Assist (IBA)
- Brake Assist (with preview function)
- Forward Collision Warning (FCW)
- Lane Departure Warning (LDW)/Lane Departure Prevention (LDP)
- Blind Spot Warning (BSW)
Fail-safeINFOID:0000000006223473
If a malfunction occurs in each system, ADAS contro l unit cancels each control, sounds a beep, and turns ON
the warning lamp or indicator lamp.
Warning buzz-
er Warning buzzer signal Activates the warning buzzer of the following systems:
 Lane Departure Warning (LDW)
 Lane Departure Prevention (LDP)
 Blind Spot Warning (BSW)
Warning sys-
tems ON indi-
cator Warning systems ON indicator signal Turns ON the warning systems ON indicator
Reception unit Signal name Description
System Reference
Intelligent Cruise Control (ICC) CCS-12, "
System Description"
Distance Control Assist (DCA)DAS-68, "System Description"
Intelligent Brake Assist (IBA)BRC-152, "INTELLIGENT BRAKE ASSIST : System De-
scription"
Brake Assist (with preview function)
BRC-145, "BRAKE ASSIST (WITH PREVIEW FUNCTION)
: System Description"
Forward Collision Warning (FCW)
DAS-218, "System Description"
Lane Departure Warning (LDW)/Lane Departure Prevention (LDP)LDW:
DAS-277, "
LANE DEPARTURE WARNING (LDW)
SYSTEM : System Description"
LDP: DAS-280, "LANE DEPARTURE PREVENTION
(LDP) SYSTEM : System Description"
Blind Spot Warning (BSW) DAS-410, "System Description"
System Buzzer Warning lamp/Indicator lamp Description
Vehicle-to-vehicle distance control mode High-pitched
toneICC system warn
ing lamp Cancel
Conventional (fixed speed) cruise control mode High-pitched
tone
ICC system warn
ing lamp Cancel
Intelligent Brake Assist (IBA) High-pitched
tone
IBA OFF indicator lamp Cancel
Forward Collision Warning (FCW) High-pitched
toneIBA OFF indicator lamp Cancel
Distance Control Assist (DCA) High-pitched
toneICC system warn
ing lamp Cancel
Lane Departure Warning (LDW) — Lane departure warning lamp Cancel
Revision: 2010 May2011 QX56

DAS-22
< SYSTEM DESCRIPTION >[ADAS CONTROL UNIT]
DIAGNOSIS SYSTEM (ADAS CONTROL UNIT)
NOTE:
 Causes of the maximum five cancella
tions (system cancel) are displayed.
 The displayed cancellation causes display the number of the ignition switch ON/OFF up to 254. It is fixed to
254 if it is over 254. It returns to 0 when the same cancellation cause is detected again.
Display Items for The Cause of Automatic Cancellation 1
Work support items Description
CAUSE OF AUTO-CANCEL 1 Displays causes of automatic system cancellation occurred during control of the following sys-
tems
 Vehicle-to-vehicle distance control mode
 Conventional (fixed speed) cruise control mode
 Distance Control Assist (DCA)
CAUSE OF AUTO-CANCEL 2 Displays causes of automatic system cancellation occurred during control of the Lane Depar-
ture Prevention (LDP) system
Cause of cancellation
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Distance Control Assist
Description
OPERATING WIPER ×The wiper operates at HI (it includes when the wiper is operated at
HI with the wiper switch AUTO position)
OPERATING ABS ××ABS function was operated
OPERATING TCS ×××TCS function was operated
OPERATING VDC ×××VDC function was operated
ECM CIRCUIT ××ECM did not permit ICC operation
OPE SW VOLT CIRC ×××The ICC steering switch input voltage is not within standard range
LASER SUNBEAM ××Intense light such as sunlight entered ICC sensor light sensing part
LASER TEMP ××Temperature around ICC sensor became low
SNOW MODE SW ××SNOW mode switch was pressed
OP SW DOUBLE
TOUCH ××
ICC steering switches were pressed at the same time
VHCL SPD DOWN ×××Vehicle speed lower than the speed as follows
 Vehicle-to-vehicle distance control mode is 24 km/h (15 MPH)
 Conventional (fixed speed) cruise control mode is 32 km/h (20
MPH)
WHL SPD ELEC NOISE ×××Wheel speed sensor signal caught electromagnetic noise
VDC/TCS OFF SW ××VDC OFF switch was pressed
VHCL SPD UNMATCH ×××Wheel speed became different from A/T vehicle speed
TIRE SLIP ××Wheel slipped
IGN LOW VOLT ×××Decrease in ADAS control unit IGN voltage
PARKING BRAKE ON ××The parking brake is operating
WHEEL SPD UNMATCH ×××The wheel speeds of 4 wheels are out of the specified values
Revision: 2010 May2011 QX56