Lexus RX300 (MCU15). Service 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.
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