TOYOTA AVALON 2001 Service Repair Manual

DI-536
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
692 Author
: Date
:
2001 AVALON (RM808U)
3 Check for open in harness and connector between ECU and body ground (See
page IN-30).
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween ECU and battery.

I13628
Theft Deterrent ECU
DSWH 18
6
B
B 1 Engine Hood
Courtesy Switch
2
W-B
BIF3
BJ1
J/C
W-B
W-B 4
2D4
2F
EDE3T4
Engine Room J/B
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-547
703 Author
: Date
:
2001 AVALON (RM808U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly and goes ON when the engine
hood is opened and goes OFF when the engine hood is closed.
WIRING DIAGRAM
DI6L4-01

I00298
1 (+)
2 (-)
DI-548
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
704 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check engine hood courtesy switch.
PREPARATION:
(a) Remove engine hood lock assembly.
(b) Disconnect engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:
Engine hood lockTester connectionSpecified condition
LOCK-No continuity
UNLOCK1 - 2Continuity
NG Replace engine hood courtesy switch.
OK
2 Check harness and connector between theft deterrent ECU and switch, switch
and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace theft deterrent ECU (See
page IN-30).

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

I14465
ECU-IG Fuse
I11586
14 (IG) (-) (+)
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-541
697 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check CIG and ECU-IG fuses.
PREPARATION:
(a) Remove the fuse box opening cover.
(b) Remove ECU-IG fuses from instrument panel J/B.
CHECK:
Check continuity of ECU-IG fuses.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the ECU-IG fuses (See at-
tached wiring diagram).
OK
2 Check voltage between terminal IG of theft deterrent ECU and body ground.
PREPARATION:
(a) Disconnect the theft deterrent ECU connectors.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IG of theft deterrent ECU
connector and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness and connector be-
tween theft deterrent ECU and battery (See page
IN-30).
OK
Check and replace theft deterrent ECU.

DI6L1-01
I13634
Theft Deterrent ECU
IND 12
3A
J5
J/C7
3G7
W-B
A
A
IGW-B
V-W V10
IC1 22
21
C9
Security Indicator
T4 J/B No. 3
W-B
DI-532
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
688 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
Indicator Light Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is preparing to set, this circuit lights up the indicator light. When the system
has been set, it continuously turns the indicator light on for 0.75 secs. and turns it off for 1.25 secs., thus
blinking the indicator light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check indicator light.
PREPARATION:
Remove combination meter.
CHECK:
Connect the positive (+) lead from the battery to terminal B22 and the negative (-) lead to terminal B21 of
combination meter connector then check indicator light comes ON.
(See combination meter on page BE-43)
NG Replace combination meter.
OK

- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-533
689 Author
: Date
:
2001 AVALON (RM808U)
2 Check harness and connector between theft deterrent ECU and indicator light,
indicator light 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 on problem symptom table (See page DI-531).

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).

I13629
Theft Deterrent ECU
LGV 3
G-W 1
IK2
G-W 1 Luggage Compartment
Door Key Unlock Switch
W-B2
A
BNJ10
J/C
L6L4 DI-544
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
700 Author
: Date
:
2001 AVALON (RM808U)
Luggage Compartment Door Key Lock and Unlock Switch Circuit
CIRCUIT DESCRIPTION
The luggage compartment door key lock and unlock switch goes ON when the luggage compartment door
key cylinder is turned to the unlock side with the key.
WIRING DIAGRAM
DI024-12