Lexus ES300 (2002 year). Manual — part 81

BODY ELECTRICAL – ACCESSORIES

BE-58

211BE37

:* With VSC System

Vehicle
Speed
Signal

Cruise Control
Switch

Stop Light
Switch

Skid Control
ECU*

Combination
Meter

VSC
Signal*

ECM

Throttle
Control Motor

Throttle
Position Sensor

Accelerator
Pedal Position
Sensor

Park/Neutral
Position Switch

211BE38

Throttle Control Motor

*: With VSC System

Combination
Meter

Skid Control
ECU*

ECM

Stop Light
Switch

Cruise Control
Switch

CRUISE CONTROL SYSTEM

1. General

Once the system is set to a desired vehicle speed, the engine throttle position is adjusted automatically to

maintain the vehicle speed at that speed without depressing the accelerator pedal.
This system is standard equipment.

The cruise control ECU is integrated with the ECM.
With this system, the ECM directly controls the throttle valve to operate the vehicle at a fixed speed be-

cause it has adopted the ETCS-i (Electronic Throttle Control System-intelligent).

2. System Diagram

3. Layout of Main Components

BODY ELECTRICAL – ACCESSORIES

BE-59

4. Function

The cruise control has the following functions.

1

Constant Speed Control

6

Low Speed Limit Control

11

Tap-Down Control

2

Set

7

High Speed Limit Control

12

Tap-Up Control

3

Coast

8

Automatic Transmission
Control

13

Diagnosis

4

Accel

9

Manual Cancel

14

Fail Safe

5

Resume

10

Auto Cancel

—

5. Self-Diagnosis Function

If the ECM detects a malfunction in the cruise control system, the ECU stores the malfunction data in
memory, in addition to illuminating the cruise indicator light. Then, the DTCs (Diagnostic Trouble Codes)
can be accessed by connecting a hand-held tester to the DLC3 terminal or the SST (09843-18040) to the Tc
and CG terminals of the DLC3 and reading the blinking of the cruise indicator light. For further details, see
the 2002 LEXUS ES300 Repair Manual (Pub. No. RM911U).

BODY ELECTRICAL – LIGHTING

BE-14

211BE57

Battery

Ignition Switch

HRLY

DRL

Body ECU

DRL
Relay
No.4

Head
Relay

DRL
Relay
No.2

DRL
Relay
No.3

Lo

Hi

Hi

Lo

*

1

*

2

Resister

DAYTIME RUNNING LIGHT SYSTEM

This system, which is directly connected to the high-beam headlights, is designed to automatically activate
them the daytime in order to keep the vehicle highly visible to other vehicles.
This system is controlled by the Body ECU.

Wiring Diagram

*

1

: Only for U.S.A. Model

*

2

: Only for Canada Model

AUTOMATIC LIGHT CONTROL SYSTEM

When the light control switch at the AUTO position, the automatic light control sensor detects the ambient

light and automatically turns the headlights and taillights ON or OFF accordingly.

This system is controlled by the Body ECU.

LIGHT AUTO TURN-OFF SYSTEM

When the headlights and taillights are illuminated through the operation of the light control switch or the

activation of the automatic light control system, if the ignition switch is turned OFF and all the door are
closed, this system continues to illuminate the headlights and taillights for approximately 30 seconds, and
then turns OFF the headlights.
However, with all the doors locked, when “LOCK” button on the wireless remote control is pushed, the
headlights and taillights are turned OFF immediately.

This system is controlled by the Body ECU.

ILLUMINATED ENTRY SYSTEM

When a door is unlocked through a key operation or transmitter operation, or if a door is opened or closed,

the illuminated entry system turns ON the interior light and the ignition key illumination.

If the ignition switch is turned to the ACC or ON position or if all doors are locked during the 15 seconds

in which these lights are ON, they will immediately turn OFF.

This system is controlled by the Body ECU.

BODY ELECTRICAL – ACCESSORIES

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DOOR LOCK CONTROL SYSTEM

1. General

The door lock control system has the following functions:

Function

Outline

Key-linked lock and
unlock function

This function, which is linked with the key cylinder, can lock or unlock
all the doors when a lock or unlock operation is effected.

Key confine prevention
function

When the key is inserted in the ignition key cylinder and if you perform
the door lock operation, all the doors will be unlocked.

Manual unlock
prohibition function

Performing the door lock operation with a transmitter or an ignition key
will prohibit the unlock operation by the door lock control switch.

2-step unlock function

This function is provided to unlock the driver’s door by turning the key
cylinder first and to unlock passenger’s door by turning it the second time.

Shift-linked automatic
door lock

When the conditions listed below are met consecutively, this function
causes all the doors to be automatically locked.
The ignition switch is turned from the “OFF” or “ACC” position to the

“ON” position.

All doors are closed.

The shift lever is moved out of P position.

Either one of the doors is unlocked.

Speed-sensitive automatic
door lock*

When the conditions listed below are met consecutively, this function
causes all the doors to be automatically locked.
Vehicle speed is higher than approximately 20 km/h (13 mph).

All doors are closed.

The shift lever position is out of P and N position.

Either one of the doors is unlocked

Shift-linked automatic
door unlock*

When the ignition switch is in the “ON” position, by shifting the shift
lever to P position from the position other than P position, all the doors
will be automatically unlocked.

Ignition switch-linked
automatic door unlock*

When the driver’s door is closed, by turning the ignition switch from ON
to OFF position and opening the driver’s door within 10 seconds all the
doors will be automatically unlocked.

Collision door lock
release

If the SRS airbag system has been deployed, and the body ECU has
detected the signal that is output by the airbag sensor assembly, the body
ECU unlocks all the doors.

*: Initial Setting = OFF