2001 TOYOTA AVALON warning

F02201
DLC1
TsTc E
1
BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-255
411 Author
: Date
:
2001 AVALON (RM808U)
2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
(a) In case of not using TOYOTA hand-held tester:
Check the sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI-325).
(5) Drive vehicle straight forward.
Drive vehicle at a speed faster than 45 km/h (28
mph) for several seconds.
HINT:
The sensor check may not be completed if the front wheels are
spun or the steering wheel is steered during this check.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunction codes are identified at the same
time, the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect the SST from ter-
minals Ts and E
1, Tc and E1 of DLC1, and turn the
ignition switch OFF.
SST 09843-18020

DI6NW-01
DI-266
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
422 Author
: Date
:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing ABS & BA & TRAC & VSC ECU, sensor, etc., turn the IG switch OFF.
SymptomSuspect AreaSee page
ABS does not operate
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
4. Check the DTC, reconfirming that the normal code is
output.
5. IG power source circuit
6. Speed sensor circuit
7. Check the brake actuator with a hand-held tester.
If abnormal, check the hydraulic circuit for leakage
(See page DI-346).
DI-252
DI-297
DI-267
BR-52
ABS does not operate efficiently
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the brake actuator with a hand-held tester.
If abnormal, check the hydraulic circuit for leakage
(See page DI-346).
DI-252
DI-267
DI-303
BR-52
ABS warning light abnormal1. ABS warning light circuit
2. ABS & BA & TRAC & VSC ECUDI-325
DTC check cannot be done
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
1. ABS warning light circuit
2. VSC warning light circuit
3. Tc terminal circuit
DI-325
DI-327
DI-342
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS & BA & TRAC & VSC ECUDI-344
VSC does not operate
Only when circuits inspected for each problem symptom
are all normal and the problem is still occurring, replace the
ABS & BA & TRAC & VSC ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Hydraulic circuit for leakage
4. Speed sensor circuit
DI-252
DI-297
DI-346
DI-267
BA does not operateStop light switch circuitDI-303
SLIP indicator light abnormalSLIP indicator light circuitDI-333
BRAKE warning light abnormal1. BRAKE warning light circuit
2. ABS & BA & TRAC & VSC ECUDI-330
VSC OFF indicator light abnormal
Only when circuits inspected for each problem symptom
are all normal and the problem is still occurring, replace the
ABS & BA & TRAC & VSC ECU.
1. VSC OFF indicator light circuit
2. VSC OFF switch circuit
DI-336
DI-336

DI6NV-03
F07884
A20
DI-262
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
418 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECU
ABS & BA & TRAC & VSC ECU:
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
IG1 (A20 - 1) - GND (A20 -
28, 29)Y-R e W-BIG switch ON10 - 14
R+ (A20 - 2) - SR (A20 - 36)GR-R e RIG switch ON, ABS warning light OFF10 - 14
R+ (A20 - 2) - MR (A20 - 7)GR-R e GR-LIG switch ONBelow 1.0
SFLR (A20 - 3) - GND (A20 -
28, 29)G-O e W-BIG switch ON, ABS warning light OFF10 - 14
SRRR (A20 - 4) - GND (A20 -
28, 29)G-R e W-BIG switch ON, ABS warning light OFF10 - 14
SFLH (A20 - 5) - GND (A20 -
28, 29)W-R e W-BIG switch ON, ABS warning light OFF10 - 14
SRRH (A20 - 6) - GND (A20 -
28, 29)GR e W-BIG switch ON, ABS warning light OFF10 - 14
FL+ (A20 - 8) - FL- (A20 - 10)BR e B-RIG switch ON, slowly turn left front wheelAC generation
RR+ (A20 - 11) - RR- (A20 -
12)G e YIG switch ON, slowly turn right rear wheelAC generation
RL+ (A20 - 13) - RL- (A20 -
14)LG e VIG switch ON, slowly turn left rear wheelAC generation
FR+ (A20 - 17) - FR- (A20 -
16)B-W e LIG switch ON, slowly turn right front wheelAC generation
GL1 (A20 - 18) - GND (A20 -
28, 29)G e W-BIG switch ON0.5 - 4.5
ML+ (A20 - 22) - ML- (A20 -
24)W-R e VIG switch ON10 - 14
SRLR (A20 - 25) - GND (A20 -
28, 29)L-Y e W-BIG switch ON, ABS warning light OFF10 - 14
SFRH (A20 - 26) - GND (A20
- 28, 29)B-W e W-BIG switch ON, ABS warning light OFF10 - 14
MT (A20 - 27) - GND (A20 -
28, 29)O e W-BIG switch ON, ABS warning light OFFBelow 1.5
IND (A20 - 31) - GND (A20 -VWBIG switch ON, SLIP indicator light ONBelow 2.0IND (A20 31) GND (A20
28, 29)V e W-BIG switch ON, SLIP indicator light OFF10 - 14
EBDW (A20 - 32) - GND (A20RYWBIG switch ON, BRAKE warning light OFFBelow 1.5EBDW (A20 32) GND (A20
- 28, 29)R-Y e W-BIG switch ON, BRAKE warning light ON10 - 14
LBL (A20 - 40) - GND (A20 -
28, 29)L-B e W-BIG switch ON, fluid level switch ONBelow 1.0

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-263
419 Author
: Date
:
2001 AVALON (RM808U) Ts (A20 - 42) - GND (A20 - 28,
29)
LG-B e W-BIG switch ON10 - 14
CSW (A20 - 44) - GND (A20 -WLWBIG switch ON, VSC OFF indicator ONBelow 1.5CSW (A20 44) GND (A20
28, 29)W-L e W-BIG switch ON, VSC OFF indicator OFF8 - 14
D/G (A20 - 46) - GND (A20 -
28, 29)W e W-BIG switch ON10 - 14
STP (A20 - 48) - GND (A20 -GWWBStop light switch ON (Brake pedal pushed)8 - 14STP (A20 48) GND (A20
28, 29)G-W e W-BStop light switch OFF (Brake pedal released)Below 1.5
SMC1 (A20 - 49) - GND (A20
- 28, 29)G-Y e W-BIG switch ON, ABS warning light OFF10 - 14
SMC2 (A20 - 50) - GND (A20
- 28, 29)V-W e W-BIG switch ON, ABS warning light OFF10 - 14
BAT (A20 - 51) - GND (A20 -
28, 29)W-L e W-BIG switch OFF10 - 14
SRC2 (A20 - 52) - GND (A20 -
28, 29)R-B e W-BIG switch ON, ABS warning light OFF10 - 14
SRLH (A20 - 53) - GND (A20 -
28, 29)Y-B e W-BIG switch ON, ABS warning light OFF10 - 14
SRC1 (A20 - 54) - GND (A20 -
28, 29)B-Y e W-BIG switch ON, ABS warning light OFF10 - 14
SFRR (A20 - 55) - GND (A20
- 28, 29)W-G e W-BIG switch ON, ABS warning light OFF10 - 14
SS1 (A20 - 59) - GND (A20 -
28, 29)W e W-BIG switch ONPulse generation
FSS (A20 - 60) - GND (A20 -
28, 29)BR e W-BIG switch OFFContinuity
SS2 (A20 - 61) - GND (A20 -
28, 29)O e W-BIG switch ONPulse generation
VCM (A20 - 65) - GND (A20 -
28, 29)P-L e W-BIG switch ON4.5 - 5.5
PMC (A20 - 66) - GND (A20 -
28, 29)R-L e W-BIG switch ON, brake pedal released0.3 - 0.8
E2 (A20 - 67) - GND (A20 -
28, 29)BR-Y e W-BIG switch OFFContinuity
SP1 (A20 - 68) - GND (A20 -
28, 29)L-O e W-BVehicle driveing at about 20 km/h (12 mph)Pulse generation
WT (A20 - 69) - GND (A20 -YRWBIG switch ON, VSC OFF indicator light ONBelow 2.0WT (A20 69) GND (A20
28, 29)Y-R e W-BIG switch ON, VSC OFF indicator light OFF10 - 14
VSCW (A20 - 70) - GND (A20PBWBIG switch ON, VSC warning light ONBelow 2.0VSCW (A20 70) GND (A20
- 28, 29)P-B e W-BIG switch ON, VSC warning light OFF10 - 14
PKB (A20 - 74) - GND (A20 -YGWBIG switch ON, parking brake switch ONBelow 2.0PKB (A20 74) GND (A20
28, 29)Y-G e W-BIG switch ON, parking brake switch OFF10 - 14
YD (A20 - 75) - GND (A20 -
28, 29)BR e W-BIG switch ON, VSC warning light OFF4.5 - 5.5
GYAW (A20 - 76) - GND (A20
- 28, 29)Y e W-BIG switch OFFContinuity
YAW (A20 - 77) - GND (A20 -
28, 29)L e W-BIG switch ON, vehicle stationaly condition2 - 3

DI-264
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
420 Author
: Date
:
2001 AVALON (RM808U) WA (A20 - 81) - GND (A20 -
BWBIG switch ON, ABS warning light ON10 - 14WA (A20 81) GND (A20
28, 29)B e W-BIG switch ON, ABS warning light OFFBelow 2.0
Tc (A20 - 84) - GND (A20 - 28,
29)LG-R e W-BIG switch ON10 - 14
Bz (A20 - 86) - GND (A20 -LWWBIG switch ON, VSC buzzer soundsBelow 1.0 e10 - 14Bz (A20 86) GND (A20
28, 29)L-W e W-BIG switch ON, VSC buzzer does not sound10 - 14

F07885
1 2 3 4 5 6 7 8 9 10
11 12 13
14
21 22 23 24 25 26
15
16 17 18 19 20
T5
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-265
421 Author
: Date
:
2001 AVALON (RM808U)
Translate ECU:
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
IG1(T5 - 1) - GND (T5 - 14)Y-R e W-BIG switch ON10 - 14
PKB2 (T5 - 2) - GND (T5 -YGWBIG switch ON, paking brake switch ONBelow 2.0PKB2 (T5 2) GND (T5
14)Y-G e W-BIG switch ON, paking brake switch OFF10 - 14
VSC+ (T5 - 4) - VSC- (T5 -
17)W e OEngine idlingPulse generation
SS1 (T5 - 5) - SS2 (T5 - 18)L e B-WEngine idlingPulse generation
RSS (T5 - 6) - GND (T5 - 14)BR e W-BIG switch OFFContinuity
P (T5 10) GND (T5 14)GWWBIG switch ON, shift lever is in P range8 - 14P (T5 - 10) - GND (T5 - 14)G-W e W-BIG switch ON, shift lever is in other than P rangeBelow 1.5
LVL2 (T5 - 11) - GND (T5 - 14)R-W e W-BIG switch ON, fluid level switch ONBelow 1.5
D (T5 12) GND (T5 14)YRWBIG switch ON, shift lever is in D range8 - 14D (T5 - 12) - GND (T5 - 14)Y-R e W-BIG switch ON, shift lever is in other than D rangeBelow 1.5
NEO (T5 - 13) - GND (T5 - 14)Y-B e W-BEngine idlingPulse generation
PKB (T5 - 15) - GND (T5 - 14)Y-G e W-BIG switch OFF, parking brake switch ONBelow 2.0
BRL (T5 16) GND (T5 14)RWWBIG switch ON, BRAKE warning light ONBelow 2.0BRL (T5 - 16) - GND (T5 - 14)R-W e W-BIG switch ON, BRAKE warning light OFF10 - 14
TRC+ (T5 - 20) - TRC- (T5 -
7)BR e W-BEngine idlingPulse generation
Tc (T5 - 21) - GND (T5 - 14)LG-R e W-BIG switch ON10 - 14
ENG+ (T5 - 22) - ENG- (T5 -
9)V e GREngine idlingPulse generation
Ts (T5 - 24) - GND (T5 - 14)LG-B e W-BIG switch ON10 - 14
LBL (T5 - 25) - GND (T5 - 14)L-B e W-BIG switch ON, fluid level switch ONBelow 1.0
CCS (T5 - 26) - GND (T5 - 14)Y-R e W-BIG switch ONBelow 2.0

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

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