Lexus RX300 (MCU15). Service manual — part 68
BE
BODY ELECTRICAL — ACCESSORIES
145
Operation
D When a door is locked through the operation of the transmitter, it locks in the normal manner; further-
more, the sub lever becomes disengaged by the function of the double locking motor. As a result, if an
attempt is made to unlock the door by operating the inside knob, the sub lever will merely mis-swing,
without being able to unlock the door.
D The locking/unlocking function of the double locking system is normally activate by operating the trans-
mitter. However, as an emergency unlocking maneuver, only the driver’s door can be unlocked with a
key.
176BE08
176BE07
Normal Lock Condition
Double Lock Condition
BODY ELECTRICAL — ACCESSORIES
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 LEXUS RX300 Repair Manual (Pub. No. RM785E).
146
JWIRELESS DOOR LOCK REMOTE CONTROL SYSTEM
1. General
The wireless door lock remote control system is a convenient system for locking and unlocking all the
doors, at a distance. This system in the RX300 has the following features:
D 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. The body ECU outputs signals to the respective ECUs via
the BEAN. Upon receiving the signals, the ECUs operate the respective actuators. However, the control
of the back door is effected by the body ECU, which operates the actuator.
D A key-integrated, two-button (lock, unlock) type transmitter has been adopted.
D A rolling code system, in which the signal configuration changes each time when a signal is transmitted
by the transmitter, has been adopted.
D The hazard light is flashed once when locking, and the hazard light is flashed twice when unlocking,
to inform that the operation has been completed.
" System Diagram A
187BE11
Transmitter
BEAN
Key Unlock
Warning
Switch
Body
ECU
Back Door
Courtesy
Switch
Serial Data Link
Door
Control
Receiver
Back Door
Lock
Motor
Hazard
Lamp Relay
Double
Lock
ECU
Driver
Door
ECU
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BODY ELECTRICAL — ACCESSORIES
147
2. Construction
Transmitter
A key-integrated, two-button (lock, unlock) type transmitter has been adopted.
This transmitter is equipped with an LED display function to monitor the condition of the battery. Further-
more, its construction allows the key molded portion and the transmitter body to be separated completely
for improved serviceability.
187BE12
LED
LED
Transmitter
Body
Door Unlock
Switch
Door Lock Switch
Front Side
Reverse Side
Door Lock
Switch
Door Unlock
Switch
Side View
Front View
Transmitter Body
3. Function
General
The wireless door lock remote control system in the RX300 has the following functions.
Function
Outline
All Doors Lock or
Unlock Operation
Pressing the door lock switch or the door unlock switch locks or unlocks
all the doors. The hazard light is flashed once when locking, and the hazard
light is flashed twice when unlocking, to inform that the operation has
been completed.
Auto Lock Function
If none of the doors are opened within approximately 30 seconds after they
are unlocked by the wireless door lock remote control, all the doors are
locked again automatically.
Illuminated Entry
Function
When all the driver’s doors are locked, pressing the “door unlock” switch
causes the interior lights to illuminate simultaneously with the unlock op-
eration.
Transmitter Switch
Misoperation
Prevention Function
When an ignition key is in the ignition key cylinder or any of the doors is
not closed completely, the wireless door lock remote control is temporari-
ly cancelled to prevent misoperation. However, unlock can be operated
when with any door opened.
Security Function
Send an operation signal as a rolling code.
Repeat Function
If no changes occur in the lock condition when the door lock switch is
pressed once, this function causes the body ECU to output a lock signal
once again.
Transmitter Recognition
Code Registration
Function
Enables the registering (writing and storing) of 4 types of transmitter rec-
ognition code in the EEPROM that is contained in the door control receiv-
er.
BODY ELECTRICAL — ACCESSORIES
Service Tip
In case of making new ignition key due to the loss of it, it is necessary to register ID code.
Refer to see the LEXUS RX300 Repair Manual (Pub. No. RM785E).
148
Transmitter Recognition Code Registration Function
The table below shows the 4 special coded ID registration function modes through which up to 4 different
codes can be registered. The codes are electronically registered (written to and stored) in the EEPROM.
For details of the recognition code registration procedure, refer to the LEXUS RX300 Repair Manual
(Pub. No. RM785E) to register the codes correctly.
Mode
Function
Rewrite Mode
Erases all previously registered codes and registers only the newly received codes.
This mode is used whenever a transmitter or the body ECU is replaced.
Add Mode
Adds a newly received code while preserving any previously registered codes.
This mode is used when adding a new transmitter. If the number of codes exceeds
4, the oldest registered code is erased first.
Confirm Mode
Confirms how many codes are currently registered. When adding a new code, this
mode is used to check how many codes already exist.
Prohibit Mode
To delete all the registered codes and to prohibit the wireless door lock function.
This mode is used when the transmitter is lost.
JENGINE IMMOBILISER SYSTEM
The engine immobiliser system is theft deterrent system which disables the engine from starting using
the ignition key with an ID code that matched is the pre-registered code in the vehicle. This system consists
of the transponder chip, coil, amplifier, and immobiliser ECU. The immobiliser ECU is enclosed in the
engine ECU. This system adopts a transponder system which uses a transponder chip embedded in the
grip of the ignition key. When the coil located around the ignition key cylinder receives the ID code signal
transmitted by the transponder chip, the engine ECU determines whether or not the ID code matches the
code stored.
" System Diagram A
165BE52
Ignition
Key
Transponder Chip
Key
Cylinder
Engine
ECU
Spark Plug
Injector
Indicator
Light
Transponder
Key Amplifier
Transponder
Key Coil
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