Infiniti QX56 (Z62). Manual - part 258

DAS

SYSTEM

DAS-69

< SYSTEM DESCRIPTION >

[DCA]

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Output Signal Item

Transmit unit

Signal name

Description

ECM

CAN com-
munica-
tion

Closed 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-
tion

Input 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-
tion

ABS 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-
tion

Steering 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-
tion

System 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-
tion

Accelerator 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

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, the 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 warning, 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 standstill, the vehicle decelerates to a standstill within the limitations
of the system. The system will release brake control with 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 accelerator

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-
nication

Meter 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-
nication

Vehicle 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-
nication

Accelerator 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

DAS

SYSTEM

DAS-71

< SYSTEM DESCRIPTION >

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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 operate when the system is under any conditions of the no operation condition. 
• When the brake pedal depressed.
• When the ICC system is set.
• When the system judges that the vehicle comes 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 system 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 direction

JSOIA0222ZZ

JSOIA0094ZZ

JPOIA0170GB

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 control 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 control 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 
tone

ICC system warning lamp

Cancel

Conventional (fixed speed) cruise control mode

High-pitched 
tone

ICC system warning lamp

Cancel

Intelligent Brake Assist (IBA)

High-pitched 
tone

IBA OFF indicator lamp

Cancel

Forward Collision Warning (FCW)

High-pitched 
tone

IBA OFF indicator lamp

Cancel

Distance Control Assist (DCA)

High-pitched 
tone

ICC system warning 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