Lexus RX300 (MCU15). Manual - part 305
DI616–05
DI–452
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
LEXUS RX300 (RM785E)
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.
Symptom
Suspect Area
See page
The theft deterrent system cannot be set
4. Indicator light circuit
5. ECU power source circuit
6. Key unlock warning switch circuit
7. Back door key lock and unlock switch circuit
8. Back door courtesy switch circuit
9. Door key lock and unlock switch circuit
10.Door courtesy switch circuit
11.Door unlock detection switch circuit
12.Engine hood courtesy switch circuit
DI–453
DI–455
DI–461
DI–463
DI–592
DI–610
DI–612
DI–608
DI–470
The indicator light does not blink when system is set.
Indicator light circuit
DI–453
When the system is set
(The system does not operate when the rear door is unlocked).
Door unlock detection switch circuit
DI–612
When the system is set
(The system does not operate when the back door is opened by a
method other than the key).
Back door courtesy switch circuit
DI–592
When the system is set
(The system does not operate when the engine hood is opened).
Engine hood courtesy switch circuit
DI–470
When the system is set
(The system does not operate when after 30 seconds put your
hand through the window and shake it near the sensor).
Radar sensor circuit
DI–468
While the system is in warning operation
(Horns do not sound).
Horn relay circuit
DI–459
While the system is in warning operation
(Siren does not sound).
Self power siren circuit
DI–465
While the system is in warning operation
(When the siren does not sound or stops soon after it starts).
Self power siren battery
BE–109
While the system is in warning operation
(Hazard lights do not flash).
Hazard switch circuit
DI–578
While the system is in warning operation
(The door lock is not locked).
Door unlock detection switch circuit
DI–608
System is still set even when a rear door is open
Door courtesy switch circuit
DI–612
Even when the system is not set
(Horns sound).
Horn relay circuit
DI–459
Even when the system is not set
(Siren sounds).
Self power siren circuit
DI–465
Even when the system is not set
(when the siren does not sound or stops soon after it starts).
Self power siren battery
BE–109
Even when the system is not set
(Hazard lights do not flash).
Hazard switch circuit
DI–578