2001 TOYOTA AVALON horn

27 Noise NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING
No
Ye s Is speaker properly installed?
Noise is produced from static eletricity accumulating in the vehicle body. With vehicles stationary lightly tap each system.
Is noise produced?Install properly.
Each system faulty. Is speaker properly installed?
No
No Ye s
Ye s
28 Noise NOISE PRODUCED WHEN ENGINE STARTS
NoYe s Whistling noise which becomes high-pitched when
accelerator strongly depressed, disappears shortly
after engine stops.Generator noise.
A/C noise.
Fuel gauge noise.
Horn noise.
Ignition noise.
Turn signal noise.
Washer noise.
Engine coolant temp. gauge noise.
Wiper noise. Whining noise occurs when A/C is operating.
Scratching noise occurs during sudden acceleration, driving on rough
roads or when ignition switch is turned ON.
Clicking sound is heard when horn button is pressed, then
released. Whirring/grating sound is heard when pushed
continuously.
Murmuring sound stops when engine stops.
Tick-tack noise occurs in co-ordination with blinking
offlasher.
Noise occurs during window washer operation.
Scratching noise occurs while engine is running,
and continues a while even after engine stops.
Scraping noise in line with wiper beat.
Other type of noiseYe s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s No
No
No
No
No
No
No
No
- BODY ELECTRICALAUDIO SYSTEM
BE-159
1763 Author
: Date
:
2001 AVALON (RM808U)

I12519
1. MAIN Fuse - 40 A
2. RDI Fuse - 30 A
3. CDS Fuse - 30 A
4. HAZ Fuse - 15 A
5. SRS WRN Fuse - 5 A
6. DCC 1 Fuse - 30 A
7. ALT-S Fuse - 5 A
8. AM2 Fuse - 10 A
9. HORN Fuse - 10 A
10. DOOR NO. 2 Fuse - 15 A
11. A/F Fuse - 25 A
12. IG2 Fuse - 15 A
13. EFI NO. 1 Fuse - 15 A
14. ABS NO. 2 Fuse - 25 A
15. ABS NO. 3 Fuse - 25 A
16. EFI NO. 2 Fuse - 7.5 A
17. ALT Fuse - 120 A
18. ABS Fuse - 60 A
19. DRL Fuse - 7.5 A
20. ABS NO. 4 Fuse - 5 A
21. HTR Fuse - 50 A
22. AM1 Fuse - 40 AEngine Room Junction Block:
1
A
D
G 2
B
E
H 3
C
F
1011
1213141516
98
45
29
28
67
20
27
30
19
2625
2324
23. H-LP LH Fuse - 15 A *2
24. H-LP RH Fuse - 15 A *2
25. H-LP LH LWR Fuse - 15 A *1
26. H-LP RH LWR Fuse - 15 A *1
27. SPARE Fuse - 10 A
28. SPARE Fuse - 15 A
29. SPARE Fuse - 25 A
30. SPARE Fuse - 30 AA. MG/CLT Relay
B. A/F Relay
C. HORN Relay
D. EFI Relay
E. IG2 Relay
F. ST Relay
G. HEAD Relay
H. HTR Relay Relays: Fuses:
*1: w/ Daytime Running Light
*2: w/o Daytime Running Light 1718
21 22
BE-10
- BODY ELECTRICALPOWER SOURCE
1614 Author
: Date
:
2001 AVALON (RM808U)

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)

DI-626
- DIAGNOSTICSBODY CONTROL SYSTEM
782 Author
: Date
:
2001 AVALON (RM808U)
WIRELESS DOOR LOCK CONTROL SYSTEM:
SymptomSuspect AreaSee page
All functions of wireless door lock control system do not operate.
1. Wireless door lock control receiver circuit
2. Key unlock warning switch circuit
3. Body ECUDI-651
DI-637
IN-30
Lock or unlock function does not operate.
1. Door key lock and unlock switch circuit
2. Door unlock detection switch circuit
3. Body ECUDI-688
DI-710
DI-686
DI-708
IN-30
Automatic lock function operates even if any door is opened within
30 seconds after all doors are unlocked by wireless door lock
control system.1. Door courtesy switch circuit
2. Body ECUDI-639
IN-30
Wireless door lock operates, but the buzzer does not sound.
1. Wireless door lock buzzer circuit
2. Wireless door lock receiver circuit
3. Body ECUDI-653
DI-651
IN-30
Buzzer sound, but wireless door lock function does not operate.1. Wireless door lock receiver circuit
2. Body ECUDI-651
IN-30
Luggage compartment door opener wireless function.1. Luggage compartment door opener motor circuit
2. Body ECUDI-649
IN-30
POWER MIRROR CONTROL SYSTEM:
SymptomSuspect AreaSee page
Mirror does not operate.
1. CIG/RAD fuse
2. Mirror switch circuit
3. Mirror motor
4. Body ECU
5. Wire harnessBE-9
DI-515
BE-1 14
IN-30
IN-30
Mirror operates abnormally.
1. Mirror switch circuit
2. Mirror motor
3. Body ECU
4. Wire harnessDI-515
BE-1 14
IN-30
IN-30
HORN SYSTEM:
SymptomSuspect AreaSee page
Horn system does not operate.
1. HORN fuse
2. Horn circuit
3. Wire harnessBE-9
DI-672
IN-30
Horns blow all the time.1. Horn circuit
2. Wire harnessDI-672
IN-30
One horn operates but the other horn does not operate.1. Horn circuit
2. Wire harnessDI-672
IN-30
Horns operate abnormally.1. Horn circuit
2. Wire harnessDI-672
IN-30

DI6LI-01
I11362I11578I11577I13264
B4
B5
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-619
775 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECU
Terminal No. (Symbols)Wring ColorConditionSTD Voltage (V)
1 e B5-14
(BDR1 eGND1)- e W-BConstant10 - 14 V
2 e B5-14WBIgnition switch OFF or ACCBelow 1 V2 e B5 14
(SIG eGND1)- e W-BIgnition switch ON10 - 14 V
3 e B5-14WBIgnition switch OFFBelow 1 V3 e B5 14
(ACC e GND1)- e W-BIgnition switch ACC or ON10 - 14 V
5 e B5-14WBEach door are openedBelow 1 V5 e B5 14
(ILL e GND1)- e W-BAll door are closed10 - 14 V
7 e B5-14
(BDR2 e GND1)- e W-BConstant10 - 14 V
8 e B5-14WBIgnition switch ON and light control switch HEADBelow 2 V8 e B5 14
(HEAD e GND1)- e W-BIgnition switch ON and light control switch OFF10 - 14 V
9 e B5-14WBIgnition switch ON and light control switch TAILBelow 2 V9 e B5 14
(TRLY e GND1)- e W-BIgnition switch ON and light control switch OFF10 - 14 V
10 e B5-14WBHorn switch position is ONBelow 1 V10 e B5 14
(HORN e GND1)- e W-BHorn switch position is OFF10 - 14 V
11 e B5-14WBBrake pedal is pushed10 - 14 V11 e B5 14
(STOP e GND1)- e W-BBrake pedal is releasedBelow 1 V
B4-1 e B5-14GWWBPark/neutral position switch is except P position10 - 14 VB4 1 e B5 14
(P e GND1)G-W e W-BPark/neutral position switch is P positionBelow 1 V
B4-2 e B5-14BWWBHeadlight control switch position is FLASHBelow 1 VB4 2 e B5 14
(HF e GND1)B-W e W-BHeadlight control switch position is except FLASH10 - 14 V
B4-3 e B5-14RYWBLight control switch HEADBelow 2 VB4 3 e B5 14
(HEAD e GND1)R-Y e W-BLight control switch OFF or TAIL10 - 14 V
B4-4 e B5-14GOWBLight control switch AUTOBelow 2 VB4 4 e B5 14
(AUTO e GND1)G-O e W-BLight control switch OFF, TAIL or HEAD10 - 14 V
B4-5 e B5-14RLWBDriver door closed10 - 14 VB4 5 e B5 14
(DCTY e GND1)R-L e W-BDriver door openedBelow 1 V
B4-6 e B5-14RWBLuggage compartment door is openedBelow 1 VB4 6 e B5 14
(LGC e GND1)R e W-BLuggage compartment door is closed10 - 14 V

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

I11588
(-) (+)
24 (SH)
I11582
(-) (+)
1
DI-538
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
694 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the horns blow normally whenever the horn switch is oper-
ated. If horn operation is not normal when the horn switch is operated, check the horn switch.
1 Check voltage between terminal SH of theft deterrent ECU connector and body
ground.
PREPARATION:
Disconnect the theft deterrent ECU connectors.
CHECK:
Measure voltage between terminal SH 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 horn relay.
OK
2 Check voltage between terminal 1 of theft deterrent horn connector and body
ground.
PREPARATION:
Remove the theft deterrent horn and disconnect the connector.
CHECK:
Measure voltage between terminal 1 of theft deterrent horn
connector and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness and connector be-
tween HORN fuse and theft deterrent horn.
OK