Distance - Page 195

195

4-5. Using the driving support systems

4

Driving

●

When the VSC or TRAC system is 

turned off.

●

The sensor cannot detect correctly 

because it is covered in some way.

●

When the brake control or output restric-

tion control of a driving support system 

operates.

(For example: Pre-Collision System, 

Drive-Start Control)

●

The parking brake is operated.

●

The vehicle is stopped by system control 

on a steep incline.

●

The following are detected when the 

vehicle has been stopped by system con-

trol:

• The driver is not wearing a seat belt.

• The driver’s door is opened.

• The vehicle has been stopped for about 3 

minutes.

If vehicle-to-vehicle distance control mode 

is automatically canceled for any reasons 

other than the above, there may be a mal-

function in the system. Contact your Lexus 

dealer.

■

Automatic cancelation of constant 

speed control mode

Constant speed control mode is automati-

cally canceled in the following situations:

●

Actual vehicle speed is more than 

approximately 10 mph (16 km/h) below 

the set vehicle speed.

●

Actual vehicle speed falls below approxi-

mately 20 mph (30 km/h).

●

VSC is activated.

●

TRAC is activated for a period of time.

●

When the VSC or TRAC system is 

turned off.

●

When the brake control or output restric-

tion control of a driving support system 

operates.

(For example: Pre-Collision System, 

Drive-Start Control)

●

The parking brake is operated.

If constant speed control mode is automati-

cally canceled for any reasons other than 

the above, there may be a malfunction in the 

system. Contact your Lexus dealer.

■

Situations in which the curve speed 

reduction function may not operate

In situations such as the following, the curve 

speed reduction function may not operate:

●

When the vehicle is being driven around 

a gentle curve

●

When the accelerator pedal is being 

depressed

●

When the vehicle is being driven around 

an extremely short curve

■

Brake operation

A brake operation sound may be heard and 

the brake pedal response may change, but 

these are not malfunctions.

■

Warning messages and buzzers for 

dynamic radar cruise control with 

full-speed range

Warning messages and buzzers are used to 

indicate a system malfunction or to inform 

the driver of the need for caution while driv-

ing. If a warning message is shown on the 

multi-information display, read the message 

and follow the instructions. (



P.163, 338)

■

When the sensor may not be correctly 

detecting the vehicle ahead

In the case of the following and depending 

on the conditions, operate the brake pedal 

when deceleration of the system is insuffi-

cient or operate the accelerator pedal 

when acceleration is required.
As the sensor may not be able to correctly 

detect these types of vehicles, the approach 

warning (



P.192) may not be activated.

●

Vehicles that cut in suddenly

●

Vehicles traveling at low speeds

●

Vehicles that are not moving in the same 

lane

●

Vehicles with small rear ends (trailers 

with no load on board, etc.)