2011 INFINITI QX56 brake sensor

DAS
COMPONENT PARTSDAS-67
< SYSTEM DESCRIPTION > [DCA]
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Component DescriptionINFOID:0000000006223499
Component Description
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 a brake fluid pres-
sure control signal to ABS actu ator and electric unit (control unit) via CAN communica-
tion
 ADAS control unit transmits the buzzer output signal to the combination meter via CAN communication
 ADAS control unit transmits an accelerator pedal feedback force control signal to the accelerator pedal actuator via ITS communication
ICC sensor  ICC sensor detects light reflected from a vehicle ahead by irradiating laser forward and
calculates a distance from the vehicle ahead and a relative speed, based on the detect-
ed 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 signal, etc. to ADAS control unit via CAN communica-
tion
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 operat ion condition to ADAS con-
trol unit via CAN communication
 ABS actuator and electric unit (control unit ) controls the brake, based on a brake fluid
pressure control signal received from ADAS control unit via CAN communication
TCM TCM transmits the signal related to A/T control to ADAS control unit via CAN communi-
cation
Combination meter Performs the following operations using the signals received from the ADAS control unit
via the CAN communication
 Displays the DCA system operation status using the meter display signal
 Illuminates the ICC system warning lamp using the ICC warning lamp signal
 Operates the buzzer (ICC warning chime) using the buzzer output signal
Dynamic driver assistance switch
(On the ICC steering switch) ECM receives an ICC steering switch (dynamic driver assistance switch) signal and trans-
mits the signal to ADAS control unit via CAN communication
ICC brake hold relay ICC brake hold relay activates the stop lamp by ICC brake hold relay drive signal (stop
lamp drive signal) outputted by the ADAS control unit
ICC brake switch  ICC brake switch is turned OFF and stop lamp switch is turned ON, when depressing the brake pedal
 ICC brake switch signal is input to ECM. These signals are transmitted from ECM to ADAS control unit via CAN communication
 Stop lamp switch signal is input to ECM and ABS actuator and electric unit (control unit). These signals are transmitted from ECM and ABS actuator and electric unit (control
unit) to ADAS control unit via CAN communication
Stop lamp switch
Transfer control unit
Transfer control unit transmits a mode selection state of 4WD shift switch to the ADAS
control unit via CAN communication
AV control unit AV control unit transmits the system selection signal to the ADAS control unit via CAN
communication
Steering angle sensor Measures the rotation amount, rotation speed, and rotation direction of steering wheel,
and then transmits them to ADAS control unit via CAN communication
Accelerator pedal actuator Accelerator pedal actuator receives an accelerator pedal feedback force control signal
from the ADAS control unit via ITS communication and pushes back the accelerator pedal
Revision: 2010 May2011 QX56

DAS
SYSTEMDAS-69
< SYSTEM DESCRIPTION > [DCA]
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Output Signal Item
Transmit unit Signal name Description
ECM CAN com-
munica-
tionClosed throttle position signal Receives idle position state (ON/OFF)
Accelerator pedal position signal Receives accelerator pedal position (angle)
ICC steering switch
signal
Dynamic driver as-
sistance switch sig-
nal Receives the operational state of the ICC steering
switch
Engine speed signal Receives engine speed
Stop lamp switch signal Receives an operational state of the brake pedal
Snow mode signal Receives an operational state of the snow mode
TCM CAN com-
munica-
tionInput speed signal Receives the number of revolutions of input shaft
Current gear position signal Receives a current gear position
Shift position signal Receives a selector lever position
Output shaft revolution signal Receives the number of revolutions of output shaft
ABS actuator
and electric unit
(control unit) CAN com-
munica-
tionABS malfunction signal Receives
a malfunction state of ABS
ABS operation signal Receives an operational state of ABS
ABS warning lamp signal Receives an ON/OFF state of ABS warning lamp
TCS malfunction signal Receives a malfunction state of TCS
TCS operation signal Receives an operational state of TCS
VDC OFF switch signal Receives an ON/OFF state of VDC
VDC malfunction signal Receives a malfunction state of VDC
VDC operation signal Receives an operational state of VDC
Vehicle speed signal (ABS) Receives wheel speeds of four wheels
Stop lamp switch signal Receives an operational state of the brake pedal
Yaw rate signal Receives yaw rate acting on the vehicle
Steering angle
sensor CAN com-
munica-
tionSteering angle sensor malfunction signal Receives a malfunction state of steering angle sensor
Steering angle sensor signal
Receives the number of revolutions, turning direction of
the steering wheel
Steering angle speed signal Receives the turning angle speed of the steering wheel
AV control unit CAN com-
munica-
tionSystem selection signal
Receives a selection state of each item in “Driver As-
sist” selected with the navigation system
Transfer control
unit CAN com-
munica-
tion
Current 4WD mode signal Receives a mode selection state of the 4WD shift mode
ICC sensor ITS com-
munica-
tion
ICC sensor signal
Receives detection results, such as the presence or ab-
sence of a vehicle ahead and distance from the vehicle
Accelerator
pedal actuator ITS com-
munica-
tionAccelerator pedal actuator operation status
signal
Receives an operational state of accelerator pedal ac-
tuator
Reception unit Signal name Description
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
Revision: 2010 May2011 QX56

DAS-70
< SYSTEM DESCRIPTION >[DCA]
SYSTEM
FUNCTION DESCRIPTION
When a vehicle is detected ahead The vehicle ahead detection indicator comes ON.
When vehicle approaches a vehicle ahead If the driver is not depressing the accelerator pedal, t
he system activates the brakes to decelerate smoothly
as necessary. If the vehicle ahead comes to a stop, the vehicle decelerates to a standstill within the limita-
tions of the system.
 If the driver is depressing the accelerator pedal, the system moves the accelerator pedal upward to assist
the driver to release the accelerator pedal.
When brake operation by driver is required The system alerts the driver by a warning chime and blinking the vehicle ahead detection indicator. If the
driver is depressing the accelerator pedal after the wa rning, the system moves the accelerator pedal upward
to assist the driver to switch to the brake pedal.
CAUTION:
If the vehicle ahead comes to a stan dstill, the vehicle decelerates to a standstill within the limitations
of the system. The system will release brake control wi th a warning chime once it judges the vehicle is
at a standstill. To prevent the vehicle from moving , the driver must depress the brake pedal. [The sys-
tem will resume control automatically once the system reaches 5 km/h (3 MPH)].
NOTE:
 Depending on the position of the accelerator pedal, the system may not be able to assist the driver to
release the accelerator pedal appropriately.
 When the driver depresses the accelerator pedal even further while the system is moving the acce\
lerator pedal upward, the accelerator pedal control will be canceled.
 When the driver is depressing the accelerator pedal, the brake control by the system is not operated.
 When the driver is depressing the brake pedal, neither the brake control nor the alert by the system oper-
ates.
 When the ICC system is set, the DCA system will be canceled.
OPERATION DESCRIPTION
ICC sensor calculates a distance from a vehicle ahead and a relative speed to transmit the ICC sensor signal
to the ADAS control unit via ITS communication. Based on the received signal, the ADAS control unit trans-
mits a control signal to the accelerator pedal actuator via ITS communication and to the ABS actuator control
unit (control unit) via CAN communication.
Combination
meter CAN commu-
nicationMeter display
signal
Vehicle ahead detec-
tion indicator signal
Transmits a signal to display a state of the system on
the information display
DCA system switch in-
dicator signal
ICC warning lamp signal Transmits an ICC warning lamp signal to turn ON the
ICC system warning lamp
Buzzer output signal Transmits a buzzer output signal to activate the buzz-
er
ICC sensor ITS commu-
nicationVehicle speed signal
Transmits a vehicle speed calculated by the ADAS
control unit
Steering angle sensor signal Transmits a steering angle sensor signal received
from the steering angle sensor
Accelerator
pedal actuator ITS commu-
nicationAccelerator pedal position signal
Transmits an accelerator pedal angle calculated by
the ADAS control unit
Accelerator pedal feedback force control
signal Transmits a target actuation force value calculated by
the ADAS control unit
ICC brake hold
relay ICC brake hold relay drive signal
Activates the brake hold relay and turns ON the stop
lamp
Reception unit Signal name Description
Revision: 2010 May2011 QX56

DAS
SYSTEMDAS-71
< SYSTEM DESCRIPTION > [DCA]
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Operation Condition
ADAS control unit performs the control when the following conditions are satisfied.
 When the DCA system setting on the navigation screen is ON.
 When the dynamic driver assistance switch is turned to ON.
 When the brake pedal is not depressed.
 When the vehicle speed is above approximately 5 km/h (3 MPH).
 When the vehicle ahead is detected.
 When the ICC system is not set.
No Operation Condition
The ADAS control unit is not operat e when the system is under any condi tions of the no operation condition.
 When the brake pedal depressed.
 When the ICC system is set.
 When the system judges that the vehicle co mes to a standstill by the system control.
 When the vehicle ahead is not detected.
Operation Cancellation Condition
The ADAS control unit cancels the operation when the syst em is under any conditions of the operation cancel-
lation condition.
 When the dynamic driver assistance switch is turned to OFF.
 When the system malfunction occurs.
 When ABS or VDC (including the TCS) operates.
 When the VDC is turned OFF.
 When the SNOW mode switch is turned ON.
 When the 4WD shift switch is turned to not AUTO position.
 When driving into a strong light (i.e., sunlight).
 When the ICC sensor body window is dirty and the measurement of the distance between the vehicles
becomes difficult.
Operation At The Driver Operation
Give priority to the driver operation in the following situation.
When vehicle approaches a vehicle ahead If the driver is not depressing the acceler-
ator pedal, the system activates the
brakes to decelerate smoothly as neces-
sary
If the driver is depressing the accelerator
pedal, the system moves the accelerator
pedal upward to assist the driver to re-
lease the accelerator pedal
When brake operation by driver is required The system alerts the driver by a warning
chime and blinking the vehicle ahead de-
tection indicator. If the driver is depressing
the accelerator pedal after the warning,
the system moves the accelerator pedal
upward to assist the driver to switch to the
brake pedal
Deceleration control It transmits the brake fluid
pressure control signal to the ABS actuator and electric unit (control unit) via
CAN communication and performs the brake control
Accelerator pedal actuation
control It transmits the accelerator pedal feedback force control signal to the accelerator pedal actuator via ITS
communication and controls the accelerator pedal in the upward directionJSOIA0222ZZ
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Revision: 2010 May2011 QX56

DAS-72
< SYSTEM DESCRIPTION >[DCA]
SYSTEM
 When the accelerator pedal is depressed again.
 When the brake pedal is depressed.
Fail-safe (ADAS
Control Unit)INFOID:0000000006223501
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.
Fail-safe (ICC Sensor)INFOID:0000000006223502
If a malfunction occurs in the ICC sensor, ADAS contro l unit cancels control, sounds a beep, and turns ON the
ICC system warning lamp in the combination meter.
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
toneIBA 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
Lane Departure Prevention (LDP) Low-pitched
tone
Lane departure warning lamp Cancel
Blind Spot Warning (BSW) — BSW warning lamp Cancel
Revision: 2010 May2011 QX56

DAS-76
< SYSTEM DESCRIPTION >[DCA]
HANDLING PRECAUTION
HANDLING PRECAUTION
Precautions for Distance Control AssistINFOID:0000000006223505
 If the vehicle ahead comes to a stop, the vehicle deceler
ates to a standstill within the limitations of the sys-
tem. The system will cancel once it judges that the vehi cle has come to a standstill with a warning chime. To
prevent the vehicle from moving, t he driver must depress the brake pedal.
 The DCA system will not apply brake control while the driver is depressing the accelerator pedal.
 This system is only an aid to assist the driver and is not a collision warning or avoidance device. It is the
driver's responsibility to stay alert, drive safe ly and be in control of the vehicle at all times.
 This system will not adapt automatically to road condi tions. Do not use the system on roads with sharp
curves, or on icy roads, in heavy rain or in fog.
 The distance sensor will not detect under most conditions.
- Stationary and slow moving vehicles
- Pedestrians or objects in the roadway
- Oncoming vehicles in the same lane
- Motorcycles traveling offset in the travel lane
 As there is a performance limit to the distance contro l function, never rely solely on the DCA system. This
system does not correct careless, inat tentive or absent-minded driving, or overcome poor visibility in rain,
fog, or other bad weather. Decelerate the vehi cle speed by depressing the brake pedal, depending on the
distance to the vehicle ahead and the surrounding circumstances in order to maintain a safe distance
between vehicles.
 The system may not detect the vehicle in front of own v ehicle in certain road or weather conditions. To avoid
accidents, never use the DCA system under the following conditions.
- On roads with sharp curves
- On slippery road surfaces such as on ice or snow, etc.
- On off-road surfaces such as on sand or rock, etc.
- During bad weather (rain, fog, snow, etc.)
- When strong light (for example, at sunrise or sunset) is directly shining on the front of the vehicle
- When rain, snow or dirt adhere to the system sensor
- On steep downhill roads (frequent braking may result in overheating the brakes)
- On repeated uphill and downhill roads
- When towing a trailer or other vehicle
 In some road or traffic conditions, a vehicle or objec t can unexpectedly come into the sensor detection zone
and cause automatic braking. Driver may need to control the distance from other vehicles using the acceler-
ator pedal. Always stay alert and avoid using the DCA system when it is not recommended in this section.
 The following are some conditions in which the sensor cannot detect the signals.
- When the reflector of the vehicle ahead is positioned high on the vehicle (trailer, etc.)
- When the reflector on the vehicle ahead is missing, damaged or covered
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray
- When the snow or road spray from traveling vehicles reduces the sensor's visibility
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor's visibility
- When excessively heavy baggage is loaded in the rear seat or the luggage room of own vehicle
 The DCA system is designed to autom atically check the sensor's operation. When the sensor is covered
with dirt or is obstructed, the system will automatically be canceled. If the sensor is covered with ice, a trans-
parent or translucent vinyl bag, etc., the DCA syste m may not detect them. In these instances, the DCA sys-
tem may not be able to decelerate the vehicle properly. Be sure to check and clean the sensor regularly.
 The DCA system is designed to help assist the driver to maintain a following distance from the vehicle
ahead. The system will decelerate as necessary and if the vehicle ahead comes to a stop, the vehicle decel-
erates to standstill. However, the DCA system can only apply up to 25% of the vehicles total braking power.
If a vehicle moves into the traveling lane ahead or if a vehicle traveling ahead rapidly decelerates, the dis-
tance between vehicles may become closer because t he DCA system cannot decelerate the vehicle quickly
enough. If this occurs, the DCA system will sound a warn ing chime and blink the system display to notify the
driver to take necessary action.
 The DCA system does not control vehicle speed or warn when driver approach stationary and slow moving
vehicles. Driver must pay attention to vehicle operat ion to maintain proper distance from vehicles ahead.
Revision: 2010 May2011 QX56

DAS
HANDLING PRECAUTIONDAS-77
< SYSTEM DESCRIPTION > [DCA]
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 The detection zone of the sensor is limited. A vehicle ahead must be in the detection zone for the system to operate.
- A vehicle ahead may move outside of the detection zone due to its
position within the same lane of travel. Motorcycles may not be
detected in the same lane ahead if they are traveling offset from
the center line of the lane. A vehicle that is entering the lane ahead
may not be detected until the vehicle has completely moved into
the lane. If this occurs, the system may warn driver by blinking the
system indicator and sounding the chime. The driver may have to
manually control the proper distance away from vehicle traveling
ahead.
- When driving on some roads, such as winding, hilly, curved, nar- row roads, or roads which are under construction, the sensor may
detect vehicles in a different lane, or may temporarily not detect a
vehicle traveling ahead. This may cause the system to work inap-
propriately. The detection of vehicles may also be affected by vehi-
cle operation (steering maneuver or traveling position in the lane,
etc.) or vehicle condition. If this occurs, the system may warn
driver by blinking the system indicator and sounding the chime
unexpectedly. The driver will have to manually control the proper
distance away from the vehicle traveling ahead.
 The approach warning chime may sound and the system display may blink when the sensor detects some reflectors which are fitted
on vehicles in other lanes or on the side of the road. This may
cause the DCA system to operate inappropriately. The sensor may
detect these reflectors when the vehicle is driven on winding
roads, hilly roads or when entering or exiting a curve. The sensor
may also detect reflectors on narrow roads or in road construction
zones. In these cases driver will have to manually control the
proper distance ahead of own vehicle. Also, the sensor sensitivity
can be affected by vehicle operation (steering maneuver or driving
position in the lane) or traffic or vehicle condition (for example, if a
vehicle is being driven with some damage).
 The DCA system automatically dec elerates own vehicle to help
assist the driver to maintain a following distance from the vehicle
ahead. Manually brake when deceleration is required to maintain a safe distance upon sudden braking by
the vehicle ahead or when a vehicle suddenly appears in front of own vehicle. Always stay alert when using
the DCA system.
 When the vehicle ahead detection indicator lamp is not illum inated, system will not control or warn the driver.
 Never place a foot under the brake pedal. A foot may be caught when the system controls the brake.
 Depending on the position of the accelerator pedal, the system may not be able to assist the driver to
release the accelerator pedal appropriately.
 If the vehicle ahead comes to a standstill, the vehicle decel erates to a standstill within the limitations of the
system. The system will rel ease brake control with a warning chime once it judges the vehicle is at a stand-
still. To prevent the vehicle from moving, the driv er must depress the brake pedal. [The system will resume
control automatically once the system reaches 5 km/h (3 MPH)].
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Revision: 2010 May2011 QX56

DAS-80
< SYSTEM DESCRIPTION >[DCA]
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