Lexus ES300 (1997 year). Manual - part 407
DI01U–01
Details of Problem
The theft deterrent system cannot be set
Inspecting Circuit*1
See page
1. Indicator light circuit
2. ECU power source circuit
3. Key unlock warning switch circuit
7. Door courtesy switch circuit
8. Door unlock detection switch circuit
9. Luggage compartment door opener
main switch and opener switch circuit
The indicator light does not blink when system is set
Indicator light circuit
When the
system is
set
When the rear door is unlocked
When the luggage compartment door is opened
by a method other than the key
4. Luggage compartment door key
lock and unlock switch circuit
5. Luggage compartment door
courtesy switch circuit
When the engine hood is opened
The system
does not
operate
Door unlock detection switch circuit
3. Luggage compartment door
courtesy switch circuit
Engine hood courtesy switch circuit
While the system is
in warning operation
Horns do not sound
Theft deterrent horn does not sound
Headlights do not flash
Taillights do not flash
The starter cut is not cut off
The door lock is not locked in unlock condition
Horn relay circuit
Theft deterrent horn circuit
Headlight control relay circuit
Taillight control relay circuit
Starter relay circuit
Door unlock detection switch circuit
6. Door key lock and unlock switch
circuit
It is not canceled when the ignition key is turned to
ACC or ON position
It still operates when the luggage compartment door is
opened with the key
When the
system is
set
Ignition switch circuit
Luggage compartment door key
lock and unlock switch circuit
System is still set even when a rear door is open
Door courtesy switch circuit
Even when the
system is not
set
Horns sound
Theft deterrent horn sounds
Headlights stay on
Taillights stay on
Horn relay circuit
Theft deterrent horn circuit
Headlight control relay circuit
Taillight control relay circuit
*1: If numbers are given to the circuit proceed with troubleshooting in the order indicated by those numbers.
10. Engine hood courtesy switch circuit
1. Luggage compartment door opener
main switch and opener switch circuit
2. Luggage compartment door
opener motor circuit
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI–405
557
1997 LEXUS ES300 (RM511U)
PROBLEM SYMPTOMS TABLE
Proceed to the reference page shown in the matrix chart below for each malfunction symptom and trouble-
shoot for each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.