Lexus RX300 (MCU15). Service manual — part 67

BE

BODY ELECTRICAL — ACCESSORIES

141

JPOWER WINDOW SYSTEM

1. General

The following four ECUs effect the control of the power window in the respective doors: the driver door
ECU, front passenger door ECU, rear RH door ECU, and rear LH door ECU. The driver’s door ECU is
integrated with the master switch. The control of other seats by the master switch is effected at the respective
ECUs, via the BEAN (Body Electronics Area Network).

2. Layout of Components

187BE08

Body ECU

Power Window Motors

Front Passenger Door ECU
(with Power Window Switch)

Power Window Switch

Power
Window
Motor

Rear RH
Door ECU

Power
Window
Switch

Rear LH Door ECU

Driver Door ECU
(with Master Switch)

Power
Window
Motor

LHD Model

3. System Diagram

187BE01

Power Window

Motor

Power Window

Switch

Power Window

Motor

Driver

Door ECU

with

Master
Switch

Rear LH

Door ECU

BEAN

Front

Passenger

Door ECU

with

Power

Window

Switch

Rear RH

Door ECU

Power Window

Motor

Power Window

Motor

Power Window

Switch

BODY ELECTRICAL — ACCESSORIES

142

4. Function

The power window system has the following functions.

Function

Outline

All-door one-touch auto up-and-down
function

The “all-door one-touch auto up-and-down” function en-
ables the window of any door to be fully opened or closed
at a touch of the power window switch.

Remote control function

The up and down operations of the front passenger window
and the rear windows can be controlled by operating the
power window master switch.

Key-off operation function

The driver’s door key-off operation function makes it pos-
sible to operate the power window for approximately 45
seconds after the ignition key is turned to the ACC or
LOCK position, before and while the driver’s door is
opened, but once it is closed, this system won’t operate.

Jam protection function

A “jam protection” function automatically stops the power
window and moves it downward if a foreign objects gets
jammed in the window during one-touch auto-up opera-
tion.

Key-linked operation function

A “key-linked operation” function, which is linked to the
driver door key cylinder operation, opens and closes the
window of the driver’s door.

BE

BODY ELECTRICAL — ACCESSORIES

143

JDOOR LOCK CONTROL SYSTEM

1. General

D This system has a “key-linked lock and unlock”, a “key-confine prevention”, and a “driver’s and front

passenger doors manual unlock prohibition” functions.

D For improved theft deterrence performance, a double locking system is standard equipment.

D This system is controlled by the body ECU. The body ECU outputs signals via the BEAN to the respective

ECUs (driver door ECU, front passenger door ECU, rear RH door ECU, rear LH door ECU, and double
lock ECU). 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 door lock motor.

" System Diagram A

187BE09

Key Unlock
Warning Switch

Ignition Switch

Body ECU

Door Lock Motor
(for Back Door)

Door Lock Motor
Position Switch
(for Back Door)

BEAN

Driver
Door
ECU

Key-linked Door
Lock Switch

Manual Door Lock Switch

Courtesy Switch

Door Lock Motor

Door Lock Motor
Position Switch

Rear RH
Door
ECU

Courtesy Switch

Door Lock Motor

Door Lock Motor
Position Switch

Rear LH
Door
ECU

Door Lock Motor
Position Switch

Door Lock Motor

Courtesy Switch

Front
Passenger
Door ECU

Door Lock Motor
Position Switch

Door Lock Motor

Courtesy Switch

Manual Door
Lock Switch

Double
Lock ECU

D
P
RR

RL

Double
Lock
Motor
Position
Switch

D P RR RL

Courtesy Switch
(for Back Door)

BODY ELECTRICAL — ACCESSORIES

CAUTION

Never activate the double locking system when there are people in the vehicle because the doors
cannot be opened from the inside of the vehicle.
If locking the doors by accident, press “Unlock” button of the transmitter.

144

2. Function

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 un lock operation
is effected.

Key confine prevention function

Provided that the key is inserted in the ignition key cylinder
and the driver’s door is open, an attempt to lock the door
will cause all the doors to unlock.

Manual unlock prohibition function

When a lock operation is effected through wireless door
lock remote control, this function prohibits the driver’s and
front passenger door lock switches from becoming un-
locked.

Double locking function

The double locking system also prevents the doors from be-
ing opened through the operation of the inside door knobs.
Thus, the doors cannot be opened either from the inside or
the outside of the vehicle.

3. Double Locking System

General

D The double locking system also prevents the doors from being opened through the operation of the inside

door knobs. Thus, the doors cannot be opened either from the inside or the outside of the vehicle.

D To lock the doors with this system, pressing the transmitter’s LOCK switch, then pressing it again within

5 seconds activates the double locking system.

Construction

The actuator contains both the mechanism for the door lock system and the double locking system including
a motor and a gear.

176BE06

Lever III

To Inside
Knob

Sub Lever

Output Lever

Actuator

Door Lock Motor

Cam
Gear

Lever II

Lever I

Double Locking Motor

Actuator

Gear I

Gear II

187BE10