2003 LEXUS LS430 Factory Repair Manual

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Page 1897 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 45: Identifying Fan Assy And Component
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OVERHAUL

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LEXUS LS430 2003 Factory Repair Manual HINT:
The installation procedures are the removal procedures in reverse order. However, only installation procedures
requiring additional information are included.
1.DRAIN ENGINE COOLANT FROM RADIA

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LEXUS LS430 2003 Factory Repair Manual Fig. 46: Disconnecting Wires From Fan Shroud
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.INSTALL FAN ASSY s
a. Install the fan with the 6 bolts.
Torque: 5.0 N m (51 kgf cm, 44 in. lbf)

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LEXUS LS430 2003 Factory Repair Manual SYSTEM NAME AND PAGE REFERENCE
1.Pay attention to the following points when inspecting the cruise control system.
a. Push the cruise control main switch ON-OFF button off when not using the cruise c

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LEXUS LS430 2003 Factory Repair Manual Fig. 1: Identifying Cruise Control System Electrical Components Location (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 1902 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 2: Identifying Cruise Control System Electrical Components Location (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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LEXUS LS430 2003 Factory Repair Manual Fig. 3: System Diagram - Cruise Control System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.CRUISE CONTROL SYSTEM

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LEXUS LS430 2003 Factory Repair Manual The computer which controls the cruise control system is combined with the ECM, and the actuator uses
the throttle position sensor and motor. A microcomputer is built into the ECM to control function

The computer which controls the cruise control system is combined with the ECM, and the actuator uses
the throttle position sensor and motor. A microcomputer is built into the ECM to control functions
including: ON-OFF, SET/COAST, RESUME/ACCEL, CANCEL, vehicle speed operation, motor output
control, and overdrive control.
The ECM compares the driving vehicle speed from the speed sensor with the stored vehicle speed
set through the cruise control main switch assy. The ECM instructs the throttle valve motor of the
throttle position sensor and motor to close the valve when the driving vehicle speed is greater than
the stored vehicle speed, and instructs it to open the valve when the driving speed is less than the
stored speed.
The ECM receives signals such as ON-OFF, SET/COAST, RESUME/ACCEL, and CANCEL from
the cruise control main switch assy and executes them.
The ECM turns on the indicator in the combination meter based upon the ON signal from the cruise
control main switch assy.
The ECM cancels the cruise control system when it detects that the brake pedal is depressed, based
on the stop lamp switch signal.
The ECM cancels the cruise control system when it detects that the shift position is changed from
D (6th, 5th or 4th gear) to N (3rd, 2nd or 1st gear), based on the park/neutral position switch assy
signal.
2.LIMIT CONTROL
a. Low speed limit
The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The
cruise control system cannot be set when the driving vehicle speed is below the low speed limit.
Cruise control operation will be automatically canceled and the stored vehicle speed will be erased
when the vehicle speed goes below the low speed limit while the cruise control is in operation.
b. High speed limit
The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph).
The cruise control system cannot be set when the driving vehicle speed is over the high speed limit.
Speed up using RESUME/ACCEL with the cruise control main switch assy also cannot be set
beyond the high speed limit.
3.OPERATION OF CRUISE CONTROL
The cruise control main switch operates seven functions: SET, COAST, TAP-DOWN, RESUME,
ACCEL, TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the 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.
a. SET CONTROL
Vehicle speed is stored and constant speed control is maintained when pushing the switch to SET/
COAST while drivin
g with the cruise control main switch ON-OFF button on (the CRUISE main

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