Lexus RX300 (MCU15). Manual - part 69

BE

BODY ELECTRICAL — ACCESSORIES

149

JTHEFT DETERRENT SYSTEM

1. General

D The theft deterrent system uses the door lock control system components and some other parts. The

theft deterrent system will operate when somebody attempts to forcibly enter the vehicle or open the
engine hood or all the doors without using transmitter, or when the battery terminals are removed and
reconnected. The warning specifications of this system are listed below.

" Warning Specifications A

Vehicle Horn

Sounds at approximately 0.25 second intervals.

Interior Light

Illuminates

Warning Method

Hazard Light

Flashing

Self Power Siren

Sounds at the cycle of the self-powered siren itself.

Door Lock Motors

Locking

Warning Time

Approximately 27.5 seconds

D The control of this system is effected by the theft deterrent ECU.

" Wireling Diagram A

187BE13

Double Lock
ECU

Driver Door
ECU

Front Passenger
Door ECU

Rear LH
Door ECU

Rear RH
Door ECU

BEAN

Body
ECU

Hazard
Light Relay

Dome Light

Wireless
Door Lock
Receiver

Self
Power
Siren

Vehicle
Horn Relay

To Vehicle Horn

Engine
ECU

Security
Indicator

Theft
Deterrent
ECU

Back Door
Key Cylinder
Unlock Switch

Back Door
Key Cylinder
Lock Switch

Hood Courtesy Switch

BODY ELECTRICAL — ACCESSORIES

150

" List of Input Output Signals A

Transmission

ECU

Input

Signal

Outline

IG

Condition signal from ignition key switch.

KSW

Signal indicating the presence of absence of a key in ignition key cylinder.

WDLK

Lock signal from wireless door lock remote control.

WDUL

Unlock signal from wireless door lock remote control.

Body ECU

LSWB

Door lock position switch signal from back door.

DSWB

Condition signal from back door courtesy switch.

ACC

Condition signal from ACC switch.

ILE

Interior light illumination output signal.

HAZ

Output signal to hazard light relay.

DCTY

Condition signal from driver door courtesy switch.

Driver Door

DKL

Lock signal from driver door key cylinder.

ve

oo

ECU

DKUL

Unlock signal from driver door key cylinder.

LSWD

Door lock position switch signal from driver door.

Front

Passenger

PCTY

Condition signal from front passenger door courtesy switch.

Passenger

Door ECU

LSWP

Door lock position switch signal from front passenger door.

Rear LH 

LCTY

Condition signal from rear left door courtesy switch.

Rear LH

Door ECU

LSWL

Door lock position switch signal from rear left door.

Rear RH 

RCTY

Condition signal from rear right door courtesy switch.

ea

Door ECU

LSWR

Door lock position switch signal from rear right door.

IND

Output signal to security indicator.

HORN

Output signal to vehicle’s horn relay.

DSWH

Condition signal of hood courtesy switch.

Theft

IG

Condition signal from ignition key switch.

Theft

Deterrent

ECU

KSW

Signal indicating the presence or absence of a key in ignition key cylinder.

ECU

BDSL

Lock signal from back door key cylinder.

BDSU

Unlock signal from back door key cylinder.

TRIG

Controls self-powered siren conditions.

CTLS

Outputs signals to activate self-powered siren.

All ECU

MPX1,2

Multiplex Communication (BEAN)

2. Operation

187BE40

Condition (3)

Condition (6)

Condition (5)

Condition (1)

Condition (2)

Condition (4)

Non-Alert State

Alert Preparation State

Alert State

Alarm State

Condition (5)

BE

BODY ELECTRICAL — ACCESSORIES

151

Non-Alert State: When the security function is inactive.

Without having the ignition key in the key cylinder, if any one of the conditions listed below exists, the
system transfers to the alert preparation state.

Condition (1)

When the doors and engine hood are all closed, the wireless door lock remote control system is used
to lock all doors.

Alert Preparation State: a delay time until the alert state

The system transfers to the alert state if the condition (2) listed below is met, and to the non-alert state
if one of the conditions (3) is met.

Condition (2)

When the doors and engine hood are all closed and locked, and 30 seconds have elapsed.

Condition (3)

D When one of the doors or engine hood is changed from “close” to “open” condition.

D When one of the doors or engine hood is changed from “lock” to “unlock” condition.

D When the ignition key is inserted in the key cylinder.

D When a terminal is disconnected from the battery and reconnected.

Alert State: a state in which attempted theft can be detected

The system transfers to the alarm state if any one of the conditions (4) listed below is met, or to the non-alert
state if any one of the conditions (5) is met.

Condition (4)

D Any door or engine hood is opened.

D The wireless door lock remote control system other than the transmitter is used for unlocking.

D The engine hood is opened.

D A terminal is disconnected from the battery and reconnected.

D The wiring harness is directly connected as if to turn the ignition switch ON.

BODY ELECTRICAL — ACCESSORIES

152

Condition (5)

The transmitter of the wireless door lock remote control system is used to unlock the doors.

Alarm State: a state in which attempted theft can be detected

D When an attempted theft is detected, the system sounds the vehicle’s horn and self power siren flashes

the hazard lights, and illuminates the interior light to alert the people in the area. If any one of the doors
is unlocked, and the ignition key is not inserted in the ignition key cylinder, the system forcefully locks
the doors once.

D The system transfers to the alert state if the condition (6) described below is met, or, when the system

is in the alarm state, it transfers to the non-alert state if the condition (5) described above is met.

Condition (6)

D After approximately 27.5 seconds of the alarm time have elapsed.