2001 TOYOTA AVALON Wiring diagram

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

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

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

I13632
Theft Deterrent ECU
SH- 25 5
1 2
7
FL Block
FL MAIN
Battery11HORN
F7 F6IF3 2C
2G
BB-RSH 24
BT4
T2
Theft
Deferrent
HornW Driver Side J/B
B-R
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
DI-537
693 Author
: Date
:
2001 AVALON (RM808U)
Theft Deterrent Horn Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, the relay in the ECU turns ON and OFF cycles of approximately
0.2 sec., causing the theft deterrent horn to blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the relay in the ECU turns OFF, thus stopping
the theft deterrent horn from blowing:
(1) Unlock the front LH or RH door with key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
(5) Push the panic switch of the wireless door lock control system.
WIRING DIAGRAM
DI6L2-01

V08423 Knock Sensor 1
GRECM
KNK
E1 12
E6
WIRING DIAGRAM
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
DTC P0325Knock Sensor 1 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which
generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No. DTC Detecting Condition Trouble Area
P0325No knock sensor 1 signal to ECM with engine speed,
1,200 rpm or more.
Open or short in knock sensor1 circuit

Knock sensor 1 (looseness)

ECM
If the ECM detects the above diagnosis conditions, it operates the fall safe function in which the corrective retard angle
value is set to the maximum value.

Diagnostic Trouble Code No. and Detection Item

Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained.

Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem.

IN-28
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
28 Author
: Date
:
2001 AVALON (RM808U)
6. CIRCUIT INSPECTION
How to read and use each page is shown below.