Lexus RX300 (MCU15). Manual — part 308
DI–464
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DIAGNOSTICS
THEFT DETERRENT SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.
1
Check luggage compartment door lock and unlock switch using hand–held tes-
ter.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the luggage compartment door lock and unlock switch using DATA LIST.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page DI–452).
NG
2
Check back door key lock and unlock switch (See page BE–97).
NG
Repair or replace back door key lock and unlock
switch.
OK
3
Check harness and connector between theft deterrent ECU and key lock and un-
lock switch, key lock and unlock switch and body ground (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace theft deterrent ECU.*1
*1: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown in problem symptom table (See page DI–452).
I19247
Theft Deterrent ECU
CLTS
9
L–B
4
T15
Theft Deterrent Siren
W–B
T5
A
J15
J/C
IM2
BM
TRIG
10
T5
+B1
11
T4
CONT
4
TRIG
GND
+B
Instrument Panel J/B
To
ECU–B Fuse
*1: LHD
*2: RHD
Y
G–B (*1)
W–L (*2)
(*1)
L–B
2
3
12
IM2
Y
6
1H
9
1D
10
1G
G–B (*1)
W–L (*2)
7
IM1
7
IM2
(*2)
1
G–B (*1)
W–L
(*2)
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DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI–465
LEXUS RX300 (RM785E)
Self Power Siren
CIRCUIT DESCRIPTION
Based on the alarm sounding state input from the theft deterrent ECU (to the TRIG terminal) an alarm is
issued.
However, the armed/disarmed state is determined by the CONT terminal, which monitors vehicle status, and
input to the TRIG terminal is only accepted from the ECU while armed state is ON.
Moreover, open circuit detection is only carried out while armed state is ON.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.
1
Check self power siren using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check that the self power alarm can operated in an ACTIVE TEST.
OK:
The self power alarm should sound.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page DI–452).
DI61I–02
I19173
1
2
4
3
*1: wave pattern
*2: wave pattern
HIGH
(1.5 V or more)
HIGH
(1.5 V or more)
LOW
(Below 1.5 V)
LOW
(Below 1.5 V)
T1: 0.15 – 1.3 secs
T2: 0.15 – 0.25 secs
T1
T1
T1
T2
DI–466
–
DIAGNOSTICS
THEFT DETERRENT SYSTEM
LEXUS RX300 (RM785E)
NG
2
Check self power siren.
PREPARATION:
Remove the self power siren.
CHECK:
(a)
Case 1:
Check terminal 3 in case of the system set signal is not
input to the siren.
(b)
Case 2:
Check terminal 4 in case of the siren drive signal is not in-
put when the alarm is triggered.
OK:
Tester connection
Condition
Specified condition
1 – Ground
Constant
Battery voltage
4 – Ground
Constant
No voltage
When transforming from
armed or arming prepara-
tion state to disarmed
state.
Using an oscilloscope *1
2 – Ground
When transforming from
the arming preparation
state to armed state.
Using an oscilloscope *2
Normal condition
Approx. 1.4 V
3
Ground
Normal condition
Battery voltage
3 – Ground
Arming condition
Below 1 V
OK
Replace self power siren.
NG
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DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI–467
LEXUS RX300 (RM785E)
3
Check harness and connector between ECU and alarm, alarm and body ground
(See page IN–32).
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptom table (See page DI–452).
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