Infiniti QX56 (Z62). Manual — part 166

COMPONENT PARTS

BRC-149

< SYSTEM DESCRIPTION >

[INTELLIGENT BRAKE ASSIST]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000006248458

1.

ICC steering switch

2.

Information display, ICC system
warning lamp, IBA OFF indicator
lamp, buzzer
(On the combination meter)

3.

BCM
Refer to

BCS-4, "BODY CONTROL

SYSTEM : Component Parts Loca-
tion"

4.

Transfer control unit
Refer to

DLN-10, "Component Parts

Location"

5.

ICC brake hold relay

6.

ECM
Refer to

EC-16, "Component Parts

Location"

7.

ICC sensor

8.

TCM
Refer to

TM-10, "A/T CONTROL

SYSTEM : Component Parts Loca-
tion"

9.

ABS actuator and electric unit (con-
trol unit)
Refer to

BRC-10, "Component Parts

Location"

10. Stop lamp switch

11.

ICC brake switch

12. IBA OFF switch

JSOIA0362ZZ

BRC-150

< SYSTEM DESCRIPTION >

[INTELLIGENT BRAKE ASSIST]

COMPONENT PARTS

Component Description

INFOID:0000000006248459

×

: 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 instrument lower driver
panel

Component

Function

Description

V

e

h

ic

le

-to-v

eh

ic

le

di

st

a

n

c

e

co

ntro

l m

o

de

Co

nv

en

ti

o

n

a

l

(f

ixe

d

sp

ee

d) c

rui

se

co

nt

rol

mo

de

In

te

lli

ge

nt Brak

e Ass

is

t

(IB

A

)

Brak

e

Ass

is

t (wi

th p

rev

ie

w fu

nc

tio

n

)

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 pressure 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

COMPONENT PARTS

BRC-151

< SYSTEM DESCRIPTION >

[INTELLIGENT BRAKE ASSIST]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

NOTE:
Only IBA system uses

Combination meter

×

×

×

×

Performs the following operations using the signals received from
the ADAS control unit via the CAN communication
• Displays the ICC system operation status using the meter dis-

play signal

• Illuminates the ICC system warning lamp using the ICC warning

lamp signal

• Illuminates the IBA OFF indicator lamp using the IBA OFF indi-

cator lamp signal

• Operates the buzzer (ICC warning chime) using the buzzer out-

put signal

ICC steering switch

×

×

• ICC steering switch allows the ON/OFF of the Intelligent Cruise

Control and the settings of a vehicle speed and distance be-
tween vehicles

• ICC steering switch signal is transmitted to ECM. ECM transmits

the signal to the ADAS control unit via CAN communication

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 communi-
cation

• 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

×

×

×

×

ICC brake hold relay

×

×

ICC brake hold relay activates the stop lamp by ICC brake hold re-
lay drive signal (stop lamp drive signal) outputted by the ADAS
control unit

Transfer control unit

×

×

×

×

Transfer control unit transmits a mode selection state of 4WD shift
switch to the ADAS control unit via CAN communication

IBA OFF switch

×

Note

IBA OFF switch signal is input to the ADAS control unit

Steering angle sensor

×

Measures the rotation amount, rotation speed, and rotation direc-
tion of steering wheel, and then transmits them to ADAS control
unit via CAN communication

Component

Function

Description

V

e

h

ic

le-t

o

-v

eh

ic

le

di

st

a

n

c

e

co

nt

ro

l m

o

d

e

Co

nve

n

ti

on

al

(f

ix

ed

sp

ee

d) cru

is

e

c

o

n

tro

l

m

o

d

e

Int

e

lligent Brake Assi

st

(IBA)

Brak

e Ass

is

t

(wi

th p

rev

ie

w fu

nc

ti

o

n

)

BRC-152

< SYSTEM DESCRIPTION >

[INTELLIGENT BRAKE ASSIST]

SYSTEM

SYSTEM

INTELLIGENT BRAKE ASSIST

INTELLIGENT BRAKE ASSIST : System Description

INFOID:0000000006228299

FUNCTION DESCRIPTION

Intelligent Brake Assist (IBA) system 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 with the Intelligent Cruise Control (ICC) system.

New parts added to the IBA system is the IBA OFF indicator 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 the 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 driven 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