TOYOTA AVALON 2001 Service Repair Manual

I13640
2
Battery B
11
F7 F6FL Block
FL MAINB 2GHORNHORN RELAY
1
2
3 53
2C
2F3G-B1
1J
1110
1CBody ECU
HORN
G-B
6 G-W
1G-W
H5
Horn
LHH6Horn
RHC12Horn Switch
(in Combination
Switch)Driver Side J/B Engine Room J/B DI-672
- DIAGNOSTICSBODY CONTROL SYSTEM
828 Author
: Date
:
2001 AVALON (RM808U)
Horn circuit
CIRCUIT DESCRIPTION
The horn is connected to the body ECU and activated by the body ECU during warning of the theft deterrent
system.
WIRING DIAGRAM
DI6M4-01

N14682
1 (+)
2 (-)
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-673
829 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check horn.
PREPARATION:
Connect positive (+) lead from the battery to terminal 1 and neg-
ative (-) lead to terminal 2 of theft deterrent horn connector.
OK:
Theft deterrent horn blows.
NG Replace the horn.
OK
2 Check wireharness and connector between horn relay and body ECU, battery
and horn relay. (See page IN-30)
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table.
(See page DI-622)

- DIAGNOSTICSBODY CONTROL SYSTEM
DI-655
811 Author
: Date
:
2001 AVALON (RM808U)
Illumination circuit
CIRCUIT DESCRIPTION
Receiving the courtesy signal from either of the door ECU, the Body ECU will make the interior light, ignition
light, and foot light come on.
DI6LX-01

I13641
P-LP-LP-LP-L
P-L
P-L
P-L 1
4F
4D
4C 11
7
1D 1J9 DOME
W-L
1
11 1
1
12C DCC
2
2G
B
F7 F6FL Block
FL MAINB
BatteryV11
Vanity Light RH
2
V10
Vanity Light RH
2W-B
W-B
2
3P9
Personal Light
ON
OFF
DOOR
I17
Interior Light
ON
OFF
DOOR
4
4D
R-B13
4F
R-BG-R
G-R3
1C5
ILL
10
1D2 GAUGE No. 1IG1 RELAY
11
4
3 4
1C 1B3 1GMulti Display
3
42
2 M7
M6M7
M6 Open Door
Driver Seat Belt
10
M7R
G-W
G-R25
B5
B5
B523
11AJAR
DBEW
PBEW
FL MAIN FL Block
ALT W
1
F101
F6
F81B
B-L
Battery
11
2H 2G W-B W-R
4
IG1 AM1 I15
Ignition Switch
2
W-L7
IF1
IG
AM1
21
55W-L
B2BLBody ECU
IG1 5
G-R
IG1
G-R 11 4C10
P-L
2
1
I14
Ignition
Key
Cylinder
LightG-R Engine Room J/B
Engine Room R/B No.5Engine Room J/B J/B No.4
Driver Side J/B
Passenger
Seat Belt
Driver Side J/B J/B No.4
Driver Side J/B
8W-B
1
G-R
IG1
DI-656
- DIAGNOSTICSBODY CONTROL SYSTEM
812 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

- DIAGNOSTICSBODY CONTROL SYSTEM
DI-657
813 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check illumination light (Interior light system)(See page BE-31).
NG Replace the failure light.
OK
2 Check wireharness and connector between each illumination light and Body
ECU, battery and each illumination light (See page IN-30).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI-622).

I13648
9Key Unlock
Warning Switch
17
B4Body ECU
KSW
R-Y 11
4A 4B2
R-Y W-B12 U1
3D 22
3D
W-B
IGJ/B No. 3 J/B No. 4
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-637
793 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
DI6LO-01

DI-638
- DIAGNOSTICSBODY CONTROL SYSTEM
794 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check key unlock warning switch (See page BE-16).
NG Replace the key unlock warning switch.
OK
2 Check wireharness and connector between key unlock warning switch and Body
ECU (See page IN-30).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-622).

I13645
B-R
B-W
R-Y
P
G-O
7 8 13 14 1213Body ECU
2
3
14
4 B4
B4
B4
B4
B4HU
HF
HEAD
TAIL
AUTO
OFF
TAIL
HEAD
AUTO
LOW
HIGH
FLASH
16
W-B
IGC13
Combination Switch

Light Control Switch

Dimmer Switch
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-631
787 Author
: Date
:
2001 AVALON (RM808U)
Light control switch circuit
WIRING DIAGRAM
DI6LL-01

DI-632
- DIAGNOSTICSBODY CONTROL SYSTEM
788 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check headlight control switch (See page BE-19).
NG Replace the headlight control switch.
OK
2 Check wireharness and connector between headlight control switch and Body
ECU (See page IN-30).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-622).

I13654
L9
Luggage Compartment
Light Switch
1
R-W12 12
4E 4C
RBody ECU
6
B4
LGC
2
L7
Luggage Compartment
Door Unlock MotorL4
IK1
L25
B4TR+ J/B No. 4
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-649
805 Author
: Date
:
2001 AVALON (RM808U)
Luggage opener motor circuit
WIRING DIAGRAM
DI6LU-01