Page 1745 of 3115
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-975
1168 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check key unlock warning switch (See pageBE-29).
NG Replace the key unlock warning switch.
OK
3 Check wireharness and connector between key unlock warning switch and theft
deterrent ECU (See page IN-26).
OK Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI-965).
Page 1746 of 3115
DIB4S-02
DI-966
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1159 Author: Date:
2004 LAND CRUISER (RM1071U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU.
Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the terminals ACC
and IG of the ECU.
When the battery positive voltage is applied to the terminal IG of the ECU while the theft deterrent system
is activated, the warning stops.
Furthermore, power supplied from the terminals ACC and IG of the ECU is used as power for the door courte-
sy switch, position switch, etc.
Page 1747 of 3115
I27343
Cowl Side J/B RH
SECURITY
ECU-B2
25
3B 3C172
71
3Q3Q
B-R37
39
1 ECU-IG1+B1
5
23
1 IG1 No. 2 Relay
2E
2E 2CAM1IL314
SB
4
IG1
AM122
I18
Ignition Switch
Fusible Link Block
Engine Room R/BF161
F17
F15
1B24BAT
21 Short Pin (A)
1
1C
E 2
MAIN J/B No. 3 J/B No. 2140A ALT
29
Battery1
IF Cowl Side J/B LHT5
Theft Deterrent ECU
B-GLG
+B2 3
B SBIL312 26
2Q 22
2Q
2Q20
SBIL322IF
W-B B-GB-GL-B21
2Q IG10
B-W SBIL315 SB
L-O
Cowl Side J/B LH
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-967
1160 Author: Date:
2004 LAND CRUISER (RM1071U)
Page 1748 of 3115
DI-968
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1161 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check ECU-B2 and SECURITY fuse.
CHECK:
Check continuity of ECU-B2 and SECURITY fuse.
OK:
Continuity
NG Replace faulty fuse.
OK
2 Check voltage between terminals +B1, +B2 and E of theft deterrent ECU connec-
tor.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the theft deterrent ECU connector.
CHECK:
Measure the voltage between terminals +B1, +B2 and E.
OK:
Voltage: 10 - 14V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-965).
NG
3 Check wire harness and connector between theft deterrent ECU and body
ground (See page IN-36).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI-965).
Page 1749 of 3115
I25780
T5
Theft Deterrent ECU
SH-
1
Horn DeterrentTheftT1W
W1
IL37
SB 3Q84
3B6 Cowl Side J/B RH DI-972
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1165 Author: Date:
2004 LAND CRUISER (RM1071U)
Theft deterrent horn circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, the relay in the ECU is turned ON and OFF at of approximately
0.2 sec. interval, causing the theft deterrent horn to sound (See the wiring diagram below).
In this condition, if any of the following operations is done, the relay in the ECU is turned OFF, thus stopping
the theft deterrent horn from sounding:
(1) Unlock the driver door with key.
(2) Turn the ignition switch to ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Press the panic switch of the wireless door lock control system.
WIRING DIAGRAM
DIB4U-02
Page 1750 of 3115

BE1239
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-973
1166 Author: Date:
2004 LAND CRUISER (RM1071U)
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 theft deterrent horn using hand-held tester.
PREPARATION:
Connect the hand-held tester to the DLC 3.
CHECK:
Check that the theft deterrent horn sounds in ACTIVE TEST (See page DI-955).
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-965).
NG
2 Check theft deterrent horn.
CHECK:
Connect positive (+) lead to terminal 1 and negative (-) lead to
body ground of theft deterrent horn connector, and that the theft
deterrent horn blows.
OK:
Horn sounding.
NG Replace theft deterrent horn.
OK
3 Check wire harness and connector between theft deterrent ECU and theft deter-
rent horn (See page IN-26).
NG Check and repair wire harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-965).
Page 1751 of 3115

DI01Q-07
THEFT DETERRENT SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
Weather Conditions
When Problem
Occurred Frequency Problem OccursWeather
Outdoor Temperature
/ /
Constantly Sometimes ( Times per day, month)
Once only Brought In
Theft deterrent system cannot be set.
Indicator light does not flash when the theft deterrent system is set.
(It stays ON or does not light at all.)
Theft deterrent system
does not operate. When unlocked using the
door lock knob.
When the engine hood is
opened.
Once set system
cannot be canceled.
When door is unlocked using key or wireless door lock control system.
When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
(However, only when the system has never operated)
When the luggage compartment door is opened with the key.
System cannot be
canceled during warning
operation. When door is unlocked using key or wireless door lock control system.
When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
Warning operation starts when the system is set and the door or luggage compartment door is opened with
the key.
Others.
Date Problem First Occurred
Fine Cloudy Rainy Snowy
Various/Others
Hot Warm Cool
Cold (Approx. 5F ( 5C))
Problem Symptom
Malfunction
Horns only
Theft deterrent horn only
Headlights only
Taillights only
Starter cut only
Door lock operation only
DI-954
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1147 Author: Date:
2004 LAND CRUISER (RM1071U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 1752 of 3115

DI01P-16
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not occur
Problem Symptom Table
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
EndTitles inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages for
detailed explanations. 1
23
4
5
7
Step 5, 7 : Diagnostic steps permitting the use
of the hand-held tester and break-
out-box. P. DI-954
P. DI-954
P. IN-26
P. DI-966 - DI-976
Symptom occurs
6
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-953
1146 Author: Date:
2004 LAND CRUISER (RM1071U)
THEFT DETERRENT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
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.
For troubleshooting use a volt/ohm meter.
Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.
Perform troubleshooting in accordance with the procedure on the following page.