Infiniti FX35, FX50 (S51). Manual - part 343

CCS-192

< SYSTEM DESCRIPTION >

[DCA]

DISTANCE CONTROL ASSIST SYSTEM

SYSTEM DESCRIPTION

DISTANCE CONTROL ASSIST SYSTEM

System Diagram

INFOID:0000000005501778

System Description

INFOID:0000000005501779

FUNCTION DESCRIPTION

JSOIA0143GB

CCS

DISTANCE CONTROL ASSIST SYSTEM

CCS-193

< SYSTEM DESCRIPTION >

[DCA]

C

D

E

F

G

H

I

J

K

L

M

B

N

P

A

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

Calculate the distance and relative speed with the vehicle ahead by ICC sensor integrated unit. Control the
accelerator pedal actuator and brake booster control unit based on the calculated value via ITS communica-
tion. 

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.

JSOIA0093ZZ

JSOIA0094ZZ

JPOIA0170GB

CCS-194

< SYSTEM DESCRIPTION >

[DCA]

DISTANCE CONTROL ASSIST SYSTEM

NOTE:
DCA system settings can be changed by using the vehicle settings function in the MULTI AV system.
When the ignition switch is in ACC position, DCA system settings cannot be changed.

Operation Condition

ICC sensor integrated unit performs the control when the following conditions are satisfied. 
• When the DCA system setting on the navigation screen is ON.
• When the DCA 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 ICC sensor integrated unit is not operate when the system is under any conditions of the no operation
condition. 
• When the DCA system setting on the navigation screen is OFF.
• 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 ICC sensor integrated unit cancels the operation when the system is under any conditions of the opera-
tion cancellation condition. 
• When the DCA 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 driving into a strong light (i.e., sunlight).
• When the ICC sensor integrated unit 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 the accelerator pedal is depressed again.
• When the brake pedal is depressed.

OPERATION AND DISPLAY

Switch and Display

Deceleration control

It transmits the brake fluid pressure command signal to the brake booster control unit via ITS commu-
nication 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. 

1.

DCA switch
(Shared with LDP switch)

2.

ICC system warning lamp

3.

DCA system switch indicator

4.

Vehicle ahead detection indicator

A.

On the ICC steering switch

B.

On the combination meter

JSOIA0153ZZ

CCS

DISTANCE CONTROL ASSIST SYSTEM

CCS-195

< SYSTEM DESCRIPTION >

[DCA]

C

D

E

F

G

H

I

J

K

L

M

B

N

P

A

System Control Condition Display

The DCA system switch indicator illuminates and the system is turned ON by pressing the DCA switch at the
system OFF. 

Approach Warning Display

• If own vehicle comes closer to the vehicle ahead due to rapid deceleration of that vehicle or if another vehi-

cle cuts in, the system warns the driver with the chime and DCA system display. Decelerate by depressing
the brake pedal to maintain a safe vehicle distance if:

- The chime sounds.
- The vehicle ahead detection indicator blinks.
• The warning chime may not sound in some cases when there is a short distance between vehicles. Some

examples are:

- When the vehicles are traveling at the same speed and the distance between vehicles is not changing
- When the vehicle ahead is traveling faster and the distance between vehicles is increasing
- When a vehicle cuts in near own vehicle
• The warning chime will not sound when own vehicle approaches vehicles that are parked or moving slowly.

Warning Lamp Display

No.

Switch name

Description

1

DCA switch

Turns the DCA system ON/OFF. (When the setting of the DCA system on the navigation 
screen is ON.)

2

ICC system warning lamp

This indicates that an abnormal condition is present in the ICC system. 

3

DCA system switch indicator

Indicates that the DCA system is ON.

4

Vehicle ahead detection indicator

Indicates whether it detects a vehicle ahead. 
NOTE:
The vehicle ahead detection indicator turns OFF when the no operation condition is sat-
isfied. 

Condition

Display on combination meter

Operation status

Vehicle ahead not detected

Vehicle ahead detected

JPOIA0163ZZ

JPOIA0164ZZ

Condition

Display on combination meter

When the system judges that the brake operation by the driver is necessary

JPOIA0188ZZ