2001 TOYOTA AVALON warning

I14527
Theft Deterrent ECU
14
IG 2
1
AM1 2
4 3C
AM1 3Ignition Switch
IGY-R
1
ALT FL Block
1
W-B
FL MAIN
BatteryIG1 11
3F18
4H18
4B
13
1B
4
1C Y-R
Y-R
W-R
W-L
W-L7
IF1
1
2G1
2H 5521 3
1B
B-LB F8
F6IG1 RELAY
ECU-IG NO. 2
I15
4
2
T4
Engine Room R/B No. 5
Engine Room J/B Driver Side J/BJ/B No. 3
J/B No. 4
1
1G
F101 W DI-540
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
696 Author
: Date
:
2001 AVALON (RM808U)
Ignition Switch 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 ACC 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 courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI022-14

I13630
Theft Deterrent ECU
KSW 4B 12
W-B
W-B2
IG
Key Unlock
Warning Switch
4A2
3D 22
3D9
R-Y R-Y4
T4
U1
J/B No. 3
J/B No. 4 DI-542
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
698 Author
: Date
:
2001 AVALON (RM808U)
Key Unlock Warning Switch Circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes ON when the ignition key is inserted in the key cylinder and goes OFF
when the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is ON.
WIRING DIAGRAM
DI6L3-01

I01663
OFF
ON
1 2
3 4
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-543
699 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check key unlock warning switch.
PREPARATION:
Disconnect key unlock warning switch connector.
CHECK:
Check continuity between terminal 1 and 2 of key unlock warn-
ing switch connector, when the key is inserted to the key cylin-
der or removed.
OK:
Switch positionTester connectionSpecified condition
ON (Key inserted)1 - 2Continuity
OFF (Key removed)-No continuity
NG Replace key unlock warning switch.
OK
2 Check harness and connectors between ECU and key unlock warning switch,
key unlock warning switch and body ground (See page IN-30).
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-531).

DI01Q-10
THEFT DETERRENT SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
Weather Conditions
When Problem
Occurred Frequency Problem OccursWeather
Outdoor temperature
/ /

Constant
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.

System cannot be
canceled once set.
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-518
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
674 Author
: Date
:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI6L0-01
I11668
Door Lock Assembly

Door Lock Motor

Door Unlock Detection
SwitchLuggage Compartment
Door Key Lock and
Unlock Switch

Luggage Compartment Door Lock Motor

Luggage CompartmentDoor Courtesy Switch
Theft Deterrent Horn
Enjine Room Junction Block

HORN Fuse

HORN Relay

Headlight Control Relay
Door Lock Assembly

Door Lock Motor

Door Unlock Detection
Switch
Theft Deterrent ECU
Ignition Switch

Key Unlock Warning Switch
Driver Side Junction Block

DOME Fuse

ECU-IG No.1 Fuse

ECU-IG No.2 Fuse

Taillight Control Relay

Body ECU
Engine Hood Courtesy Switch
Security Indicator
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-529
685 Author
: Date
:
2001 AVALON (RM808U)
PARTS LOCATION

DI01U-1 1
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-531
687 Author
: Date
:
2001 AVALON (RM808U)
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.
SymptomSuspect AreaSee page
The theft deterrent system cannot be set
1. Indicator light circuit
2. ECU power source circuit
3. Key unlock warning switch circuit
4. Luggage compartment door key lock and unlock switch
circuit
5. Engine hood courtesy switch circuitDI-532
DI-534
DI-542
DI-544
The indicator light does not blink when system is set.Indicator light circuitDI-532
When the system is set
(The system does not operate when the rear door is unlocked).Door unlock detection switch circuit
DI-686
DI-708
DI-643
When the system is set
(The system does not operate when the luggage compartment
door is opened by a method other than the key).
Luggage compartment door courtesy switch circuitDI-647
When the system is set
(The system does not operate when the engine hood is opened).Engine hood courtesy switch circuitDI-547
When the system is set
(It is not canceled when the ignition key is turned to ACC or ON
position (Except Europe Models)).
Ignition switch circuitDI-540
When the system is set
(It still operates when the luggage compartment door is opened
with the key (Except Europe Models)).Luggage compartment door key lock and unlock switch
circuitDI-544
While the system is in warning operation
(Horns do not sound).Horn relay circuitDI-672
While the system is in warning operation
(Headlights do not flash).Headlight control relay circuitDI-635
While the system is in warning operation
(Taillights do not flash).Taillight control relay circuitDI-633
While the system is in warning operation
(The door lock is not locked).Door unlock detection switch circuit
DI-686
DI-708
DI-643
System is still set even when a rear door is openDoor courtesy switch circuitDI-639
Even when the system is not set
(Horns sound).Horn relay circuitDI-672
Even when the system is not set
(Headlights stay on).Headlight control relay circuitDI-635
Even when the system is not set
(Taillights stay on).Taillight control relay circuitDI-633

DI1AH-13
I11580
T4
DI-530
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
686 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Value
DSWH e EBWB
Engine hood courtesy switch ºONº
(Engine hood opened)Below 1 WDSWH e E
(T4-6 e T4-12)B e W-BEngine hood courtesy switch ºOFFº
(Engine hood closed)1 MW or higher
KSW e ERYWB
Key unlock warning switch ºONº
(Key inserted)Below 1 WKSW e E
(T4-4 e T4-12)R-Y e W-BKey unlock warning switch ºOFFº
(Key removed)1 MW or higher
LGU e E GWWBLuggage compartment door key lock and unlock switch ºONºBelow 1 WLGU e E
(T4-3 e T4-12)G-W eW-BLuggage compartment door key lock and unlock switch ºOFFº1 MW or higher
+B1 e Body ground
(T4-2 eBody ground)W-G eW-BAlways10 - 14 V
IG e E
(T4-14 e T4-12)Y-R e W-BIgnition switch is turned to ºONº position10 - 14 V
+B2 e Body ground
(T4-1 e Body ground)L-R e Body
groundAlways10 - 14 V
IND e E
(T4-12 e T4-12)V-W eW-BDuring set preparation3 - 5 V
E e Body ground
(T4-12 e Body ground)W-B e Body
groundAlways10 - 14 V
SH e SH-
(T4-24 e T4-25)B-R e WAlways10 - 14 V
MPX1 e Body ground
(T4-10 e Body ground)V e Body groundMultiplex communication circuit-

F03856
Marks
- INTRODUCTIONFOR ALL OF VEHICLES
IN-1 1
11 Author
: Date
:
2001 AVALON (RM808U)
(3) Even in cases of a minor collision where the SRS
does not deploy, the steering wheel pad, front pas-
senger airbag assembly, side airbag assembly and
seat belt pretensioner should be inspected (See
page RS- 15, RS- 30, RS- 44, RS- 57 and
BO-130).
(4) Never use SRS parts from another vehicle. When
replacing parts, replace them with new parts.
(5) Before repairs, remove the airbag sensor if shocks
are likely to be applied to the sensor during repairs.
(6) Never disassemble and repair the airbag sensor as-
sembly, steering wheel pad, front passenger airbag
assembly, side airbag assembly or seat belt preten-
sioner.
(7) If the airbag sensor assembly, steering wheel pad,
front passenger airbag assembly, side airbag as-
sembly or seat belt pretensioner has been dropped,
or if there are cracks, dents or other defects in the
case, bracket or connector, replace them with new
ones.
(8) Do not directly expose the airbag sensor assembly,
steering wheel pad, front passenger airbag assem-
bly, side airbag assembly or seat belt pretensioner
to hot air or flames.
(9) Use a volt/ohmmeter with high impedance (10 kW/V
minimum) for troubleshooting of the electrical cir-
cuit.
(10) Information labels are attached to the periphery of
the SRS components. Follow the instructions on the
notices.
(11) After work on the supplemental restraint system is
completed, check the SRS warning light (See page
DI-349).
(c) SPIRAL CABLE (in Combination Switch)
The steering wheel must be fitted correctly to the steering
column with the spiral cable at the neutral position, other-
wise cable disconnection and other troubles may result.
Refer to SR-22 of this manual concerning correct steer-
ing wheel installation.