Lexus ES300 (2002 year). Manual - part 93

BODY ELECTRICAL – WIPER SYSTEM

BE-20

209BE05

209BE06

Infrared 
Rays

Rain Sensor 
Tape

Detection Area

Windshield 
Glass

Lens

Photo Diode

Raindrop

LED

Penetrated Infrared Rays

If no raindrops are present

If raindrops are present

Service Tip

If the rain sensor tape has been peeled during a windshield glass replacement, make sure to affix a new
rain sensor tape. Failure to do so will lead to a system malfunction.

3. Construction and Operation

Rain Sensor

The rain sensor consists mainly of an LED (Light Emitting Diode) that emits infrared rays, and a photo diode
that receives those rays. The detection method is based on the infrared rays that are reflected by the front
windshield glass.
For example, if no raindrops are present in the detection area, the infrared rays emitted by the LED are all
reflected from the windshield glass and are received by the photo diode. If raindrops are present in the detec-
tion area, a portion of the emitted infrared rays penetrates with the change of index of reflection outward
of the windshield glass via the raindrops, thus reducing the amount of infrared rays that are received by the
photo diode. The amount of this reduction is then used to detect the amount of raindrops.
Thus, this function controls the INT, LO, and HI operations in order to operate the wipers at an optimal wip-
ing timing.

BODY ELECTRICAL – ACCESSORIES

BE-45

211BE31

Security
Horn

Theft
Deterrent
ECU

Door Lock
Motors

BEAN

Key Unlock
Warning
Switch

Door
Courtesy
Switches

Serial Data Link

Body ECU

Door Control
Receiver

Horn Relay

Headlight
Relay

Taillight
Relay

Service Tip

In case of making new ignition key due to the loss of it, it is necessary to register recognition code. Refer
to see the 2002 LEXUS ES300 Repair Manual (Pub. No. RM911U).

WIRELESS DOOR LOCK REMOTE CONTROL SYSTEM

1. General

The wireless door lock remote control system has been adopted as standard equipment.
This system is a convenient system for locking and unlocking all the doors, at a distance. This system in the
’02 ES300 has the following features:

 In this system, the wireless door control receiver performs the code identification process and the body

ECU effects the door lock control. Serial data link is provided for communication between the wireless
door control receiver and the body ECU.

 Key-integrated, three-button type transmitter has been adopted.
 A rolling code system, in which the signal configuration changes each time when a signal is transmitted

by the transmitter, has been adopted.

 System Diagram 



BODY ELECTRICAL – ACCESSORIES

BE-46

211BE32

Body ECU

Key Unlock
Warning Switch

Theft Deterrent
ECU

Transmitter

Door Lock Assembly

 Motor and

Position Switch

Wireless Door
Lock Receiver

Luggage Door Lock
Assembly

 Motor and Courtesy

Switch

Door Courtesy
Switch

Door Lock Assembly

 Motor and

Position Switch

Door Courtesy
Switch

Door Lock Assembly

 Motor and

Position Switch

2. Layout of Component

BODY ELECTRICAL – ACCESSORIES

BE-47

3. Function

General

The wireless door lock remote control system in the ’02 ES300 has the following functions.

Function

Outline

All Doors Lock
Operation

Pressing the door lock switch of the transmitter locks all doors.

All Doors Unlock
(2-step Unlock)
Operation

Pressing the door unlock switch twice within 3 seconds opens all doors after
opening the driver’s door.

Luggage Door
Open Operation

Keeping the luggage door opener switch of the transmitter pressed longer then
about 1 second opens the luggage door.

Power Window
Open Operation

 Keeping the “door unlock” switch of the transmitter pressed longer than 2.5

seconds opens all the doors and the moon roof.

 With this function, the buzzer sounds when control is started.

Answer Back
Operation

When the transmitter is used for locking or unlocking the doors, for opening
the luggage door, or a power window is operated, this function momentarily
sounds the buzzer to inform the user that the operation has been completed.

Operation

When the transmitter is used for locking the doors, this function flashes the
hazard lights to inform the user that the operation has been completed.

Panic Alarm
Operation

Keeping the PANIC switch of the transmitter pressed longer than about 2 ~ 3
seconds activates the alarm of the theft deterrent system (to sound the horn,
flash the headlights, taillights, and hazard lights).

Automatic Lock
Function

If none of the doors are opened within 30 seconds after they are unlocked by
the wireless door lock remote control, all the doors are locked again
automatically.

Repeat Function

If a door is not locked in response to the locking operation of the transmitter,
the body ECU will output a lock signal after the 1 second.

Illuminated Entry
Function

When all the doors are locked, pressing the door unlock switch causes the
interior lights to illuminate simultaneously with the unlock operation.

Security Function

Sends an operation signal as a rolling code.

Door Ajar warning
Function

If any door is open or ajar, pressing the “door lock” switch of the transmitter
will cause the wireless door lock buzzer to sound for about 10 seconds.

Transmitter
Recognition Code
Registration Function

Enables the registering (writing and storing) of 4 types of transmitter
recognition codes in the EEPROM that is contained in the body ECU.

Self-Diagnosis

If there is a malfunction in the system, the body ECU stores the DTCs
(Diagnostic Trouble Codes) in its memory.