2003 LEXUS LS430 Factory Repair Manual

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Page 2529 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 3: Wiring Diagram - Dynamic Radar Cruise Control System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 2530 of 4500

LEXUS LS430 2003 Factory Repair Manual Input and output signals of each ECU.
Fig. 4: ECU Input And Output Signals Chart (1 Of 2)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 2531 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 5: ECU Input And Output Signals Chart (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 2532 of 4500

LEXUS LS430 2003 Factory Repair Manual 1.GENERAL
a. The dynamic radar cruise control system has two cruise control modes: the constant speed control
mode and vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance cont

1.GENERAL
a. The dynamic radar cruise control system has two cruise control modes: the constant speed control
mode and vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance control mode is always selected when starting up the
dynamic radar cruise control system.
Operation of the constant speed control mode is the same as that for the conventional type
cruise control system.
b. This system maintains the vehicle running at the speed that the driver has set, as long as there are
no vehicles ahead in the same lane. Then, the system maintains the vehicle distance that has been
set by the driver.
If the system detects a vehicle moving at a slower speed ahead while the driver is driving at a
constant speed, it closes the throttle valve to decelerate. If further deceleration is required, the
system controls the brake actuator in order to apply the brakes. Thereafter, if there are no vehicles
ahead within the set vehicle-to-vehicle distance because either the vehicle ahead or the driver has
changed lanes, the system accelerates slowly to reach the set vehicle speed and resumes driving at
the constant speed.
c. The constant speed control mode is designed to maintain a constant cruising speed. The vehicle-to-
vehicle distance control mode is designed to control cruising at a constant speed function,
deceleration cruising function, follow-up cruising function and acceleration cruising function.
d. The millimeter wave radar sensor and the distance control ECU (cruise control ECU) control the
system while the vehicle-to-vehicle distance control mode is in operation, and send signals to each
actuator and ECU.
e. In vehicle-to-vehicle distance control mode, the dynamic radar cruise control system receives
signals from the yaw rate & deceleration sensor and the steering angle sensor. Based on these
signals, it then estimates curve radius and compensates for information on the preceding vehicle
while turning. It can also compensate for the brake control when approaching another vehicle.
f. This system judges the existence of a vehicle in front and the distance to it based on the signals
from the radar sensor while the vehicle-to-vehicle distance control mode is in operation. Using this
information, the system informs the driver of any danger with the warning buzzer, performs brake
control, and turns on the stop lamp when approaching the vehicle in front.
g. The following illustration shows a control example under the following conditions: own vehicle
speed is 100 km/h (62 mph) and the speed of the vehicle in front is 80 km/h (50 mph).

Page 2533 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 6: Dynamic Radar Cruise Control System Cruise Control Example Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Setting of the vehicle distance can be changed to 3 distances by operating the d

Page 2534 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 7: Main Components Function Chart (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 2535 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 8: Main Components Function Chart (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.LIMIT CONTROL
a. Low speed limit
The lowest possible limit of the speed setting range is set at appro

Page 2536 of 4500

LEXUS LS430 2003 Factory Repair Manual RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control main
switch assy is an automatic return type switch which turns on only while operating it in each arrow
dire

RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control main
switch assy is an automatic return type switch which turns on only while operating it in each arrow
direction and turns off after releasing it.
The dynamic radar cruise control system has two cruise control modes: the constant speed control mode
and vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar
cruise control system.
Operation of the constant speed control mode is the same as that for the conventional type cruise
control system.
a. MODE CONTROL
Pushing the switch to MODE for more than 1 second while driving with the cruise control
main switch ON-OFF button on (RADAR READY is on) switches the mode to the constant
speed control mode.
b. SET CONTROL (Constant speed control mode)
Vehicle speed is stored and constant speed control is maintained when pushing the switch to
SET/ COAST while driving with the vehicle speed within the set speed range (between the
low and high speed limits) after pushing the cruise control main switch ON-OFF button on
(RADAR READY is on), and entering the constant speed control mode.
c. SET CONTROL (Vehicle-to-vehicle distance control mode)
Vehicle speed is stored and vehicle-to-vehicle control is maintained when pushing the switch
to SET/ COAST while driving with the cruise control main switch ON-OFF button on
(RADAR READY is on), and vehicle speed is within the set speed range (between the low
and high speed limits).
d. COAST CONTROL (Constant speed control mode)
The ECM makes the cruise control demanding throttle opening angle zero degrees and
decelerates the vehicle (the throttle valve is not fully closed due to the idle speed control,
etc.) when SET/COAST on the cruise control main switch is pressed and held while the
constant speed control mode is in operation. Vehicle speed, when the cruise control main
switch is released from SET/COAST, is stored and constant speed control is maintained.
e. COAST CONTROL (Vehicle-to-vehicle distance control mode)
When SET/COAST on the cruise control main switch is pressed and held while the vehicle-
to-vehicle distance control mode is in operation, the stored vehicle speed decreases by
approximately 5 km/h (CANADA) or 5 mph (USA) per second.
f. TAP-DOWN CONTROL (Constant speed control mode)
When tapping down on the cruise control main switch to SET/COAST (for approximately
0.5 second) while the constant speed control mode is in operation, the stored vehicle speed
decreases each time by approximately 1.6 km/h (1 mph). However, when the difference
between the driving and the stored vehicle speeds is more than 5 km/h (3 mph), the vehicle
speed, when the cruise control main switch is released from SET/COAST, will be stored and
constant speed control is maintained.
g. TAP-DOWN CONTROL (Vehicle-to-vehicle distance control mode)
When tappin
g down on the cruise control main switch to SET/COAST (for approximately

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