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.
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