2003 LEXUS LS430 Factory Repair Manual

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Page 2537 of 4500

LEXUS LS430 2003 Factory Repair Manual 0.5 second) while the vehicle-to-vehicle distance control mode is in operation, the stored
vehicle speed decreases each time by approximately 5 km/h (CANADA) or 5 mph (USA).
h. ACCELERATOR CONTROL

0.5 second) while the vehicle-to-vehicle distance control mode is in operation, the stored
vehicle speed decreases each time by approximately 5 km/h (CANADA) or 5 mph (USA).
h. ACCELERATOR CONTROL (Constant speed control mode)
The throttle valve motor of the throttle position sensor and motor is instructed by the ECM to
open the valve when RESUME/ACCEL 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 RESUME/ACCEL, is stored and constant speed control is
maintained.
i. ACCELERATION CONTROL (Vehicle-to-vehicle distance control mode)
When RESUME/ACCEL 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 increases
by approximately 5 km/h (CANADA) or 5 mph (USA) per second.
Pushing the cruise control main switch to RESUME/ACCEL while following the vehicle in front
with the vehicle-to-vehicle distance control mode does not increase the actual vehicle speed, but
changes only the set vehicle speed.
j. TAP-UP CONTROL (Constant speed control mode)
When tapping up on the cruise control main switch to RESUME/ACCEL (for approximately
0.5 second) while the constant speed control mode is in operation, the stored vehicle speed
increases 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 stored
vehicle speed will not be changed.
k. TAP-UP CONTROL (Vehicle-to-vehicle distance control mode)
When tapping up on the cruise control main switch to RESUME/ACCEL (for approximately
0.5 second) while the vehicle-to-vehicle distance control mode is in operation, the stored
vehicle speed increases each time by approximately 5 km/h (CANADA) or 5 mph (USA).
l. MANUAL CANCEL CONTROL
<00270052004c0051004a000300440051005c00030052004900030057004b0048000300490052004f004f0052005a004c0051004a000300460044005100460048004f005600030057004b00480003004600550058004c005600480003004600520051005700
550052004f00030056005c00560057004800500003005a004b[ile in operation. (The stored
vehicle speed in the ECM is maintained.)
Depressing the brake pedal
<003000520059004c0051004a00030057004b004800030056004b004c004900570003004f0048005900480055000300570052000300440051005c0003005300520056004c0057004c0052005100030048005b0046004800530057000300270003000b001900
57004b000f000300180057004b000f00030044005100470003[4th gears)
Pushing the cruise control main switch to CANCEL
Pushing the cruise control main switch ON-OFF button off (The stored vehicle speed
in the ECM is not maintained.)
m. RESUME CONTROL
If the cruise control operation was cancelled with the stop lamp switch or the CANCEL
switch, and if driving speed is within the limit range, pushing the cruise control main switch
to RESUME/ACCEL restores vehicle speed memorized at the time of cancellation, and
maintains constant speed control. In constant speed mode, once vehicle speed goes below the
low speed limit, RESUME operation is not possible even if accelerating up to the low speed
limit, or more, again.
5.BRAKE CONTROL

Page 2538 of 4500

LEXUS LS430 2003 Factory Repair Manual The distance control ECU (cruise control ECU) determines the distance between a vehicle in front and
your own, relative speed, target decreasing speed and deceleration rate to transmit a brake demand

Page 2539 of 4500

LEXUS LS430 2003 Factory Repair Manual a. Check if any DTCs are output.
HINT:
The ECM and cruise control ECU (distance control ECU) of this system are connected to the CAN
communication system. Therefore, before starting troubleshooting

Page 2540 of 4500

LEXUS LS430 2003 Factory Repair Manual 13.(SEE TERMINALS OF ECU )
Go to Next Step.
14.PROBLEM IDENTIFICATION
Go to Next Step.
15.REPAIR OR REPLACE
Go to Next Step.
16.CONFIRMATION TEST
Go to Next Step.
END

Page 2541 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 9: Customer Problem Analysis Check Sheet
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.PROBLEM SYMPTOM CONFIRMATION
HINT:

Page 2542 of 4500

LEXUS LS430 2003 Factory Repair Manual 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 al

Page 2543 of 4500

LEXUS LS430 2003 Factory Repair Manual RES/ACC, and that the vehicle cruises at the newly set speed when the switch is released.
5. Momentarily push the cruise control main switch to RES/ACC and then immediately release
it. Check that ve

Page 2544 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 12: Inspecting COAST Function
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. Momentarily push the cruise control main switch to SET/COAST, and then immediately
release it. Check that vehicle

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