brake light TOYOTA AVALON 2001 Service Owner's Guide
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Page 634 of 1897
BR3890
F02201
DLC1
Ts E
1
Tc
BR3904
0.13 sec. 0.12 sec.
ON
OFF
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-213
369 Author: Date:
2001 AVALON (RM808U)
(d) Clear the DTC.
(1) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 times or more within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC1.
SST 09843-18020
HINT:
Cancellation cannot be done by removing the battery cable or
ECU-IG fuse.
2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
(a) Check the sensor signal.
(1) Using SST, connect terminals Ts and E
1 of DLC1.
SST 09843-18020
(2) Start the engine.
(3) 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-243).
(4) Drive vehicle straight forward.
(5) Drive vehicle at a speed faster than 45 km/h (28
mph) for several seconds.
HINT:
If the brake is applied during the check, the check routine must
be started again.
(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.
Page 636 of 1897
DI6NB-01
DI-218- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
374 Author: Date:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during DTC check but a problem still occurs, check the circuits corresponding
to each problem symptom in the order given in the table below and proceed to the relevant troubleshooting
page.
NOTICE:
When replacing ABS ECU, sensor or 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 ECU.
5. Check the DTC reconfirming that the normal code is
output.
6. Power source circuit
7. Speed sensor circuit
8. Check the hydraulic circuit for leakage.
DI-212
DI-231
DI-225
DI-249
ABS does not operate intermittently
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic circuit for leakage.
DI-212
DI-225
DI-234
DI-249
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI-243
BRAKE warning light abnormal1. BRAKE warning light circuit
2. ABS ECUDI-240
DTC check cannot be done
Only when 1. and 2. are all normal and the problem is still
occurring, replace the ABS ECU.
1. ABS warning light circuit
2. Tc terminal circuit
DI-243
DI-245
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS ECUDI-247
Page 637 of 1897
DI6NA-01
F10161
A7
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-217
373 Author: Date:
2001 AVALON (RM808U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
RR+ (A7 - 2) - RR- (A7 - 1)G e YIG switch ON
Slowly turn right rear wheelAC generation
FR+ (A7 - 5) - FR- (A7 - 4)B-W e LIG switch ON
Slowly turn right front wheelAC generation
FL+ (A7 - 7) - FL- (A7 - 6)BR e B-RIG switch ON
Slowly turn left front wheelAC generation
RL+ (A7 - 9) - RL- (A7 - 8)LG e VIG switch ON
Slowly turn left rear wheelAC generation
Ts (A7 - 11) - GND (A7 - 16,
19)LG-B e W-BIG switch ON5.7 - 8.1
Tc (A7 - 12) - GND (A7 - 16,
19)LG-R e W-BIG switch ON5.7 - 8.1
STP (A7 - 14) - GND (A7 - 16,GWWBStop light switch pushed inBelow 1.5STP (A7 14) GND (A7 16,
19)G-W e W-BStop light switch released5 - 14
IG1(A7 - 15) - GND (A7 - 16,
19)Y-R e W-BIG switch ON10 - 14
+B (A7 - 17) - GND (A7 - 16,
19)L e W-BAlways10 - 14
BAT (A7 - 18) - GND (A7 - 16,
19)L e W-BAlways10 - 14
WA (A7 - 20) - GND (A7 - 16,BWBIG switch ON, ABS warning light ONBelow 2.6WA (A7 20) GND (A7 16,
19)B e W-BIG switch ON, ABS warning light OFF10 - 14
EBDW (A7 - 21) - GND (A7 -RYWBIG switch ON, BRAKE warning light ONBelow 2.6EBDW (A7 21) GND (A7
16, 19)R-Y e W-BIG switch ON, BRAKE warning light OFF10 - 14
PN (A7 - 23) - GND (A7 - 16,LWWBIG switch ON, Shift lever is Por N range10 - 14PN (A7 23) GND (A7 16,
19)L-W e W-BIG switch ON, Shift lever is not Por N rangeBelow 2.0
Page 646 of 1897
F09824
Battery
FL MAIN F10 F8
F611 1
ALT
BFL BlockB-L 2G 2H1 1 Engine Room J/B B5512 AM1 Engine Room R/B No. 5 W-LIF17
W-L
2
IG1 AM1 4Ignition Switch W-R W
1C 1G
1B 1D
4
4 3 1
1
2
3 10 GAUGE No. 1 Driver Side J/B
IG1 Relay
W-B
IG
ED CUP
BRAKE
Multi DisplayM6 M3M6R-B
3 4
74D 4F13
4 J/B No. 4
R-B
L-O L-O6
IL1
R-WR-W
R-W
R-W
7
IC13A21
Active
Light
RelayR-Y 8A20
6040 74 68
32 ABS & BA &
TRAC & VSC ECU
FSS LBL PKB EBDW SP1
T5
T5
T5
T5 T5
Y-G
L-B
BR (Shielded)15
25 16
2
11
LBL LVL2PKB2BRL
PKB
Y-G Y-G
R-W
R-WJ/B No. 3
3B 3A
3A 3B 5
15
15 14
1Driver Side J/B
B1
Brake Fluid Level
Warning Switch Translate ECU
1H
1I 12
8
R-W
1 2
W-B J1 J/C
B B
W-BEngine Room J/B
44
2D2FW-B P3
Parking
Brake
SwitchA20
A20
A20
A20 DI-330
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
486 Author: Date:
2001 AVALON (RM808U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
The BRAKE warning light lights up when the brake fluid is insufficient, when the parking brake is ap-
plied or when the EBD is defective.
If the translate ECU detects trouble, it makes VSC warning light lights up while prohibiting VSC & TRAC
control. At this time, the ECU records a DTC in memory. Connect terminals Tc and E
1 of the DLC1 or
DLC2 to make BRAKE warning light blink and output the DTC.
WIRING DIAGRAM
DI6OK-02
Page 647 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-331
487 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-53).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-53).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS ?
YES Repair circuit indicated by the output code.
No
4 Check BRAKE warning light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
Page 672 of 1897
F09814
J/B No. 3
15
3B 15
3AABS & BA & TRAC
& VSC ECU
40
A20
LBL Driver Side J/B
Engine Room J/B
M6
Multi
DisplayIC1 Translate
ECU
L-B 25
T5 11
T5
16
T5R-W
7
R-W
3
4
R-B LVL2LBL
BRL R-W
R-W
Level
Warning Switch12
1I 8
1H
R-W
12
BB J1
J/B
W-B
EDDriver Side J/B
GAUGE No. 1
W-B
W-B
J/B No. 4
10
1DR-B4
4D13
4F 4
2D4
2F
BRAKE
DI-290
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
446 Author: Date:
2001 AVALON (RM808U)
DTC C1202 / 44 Brake Fluid Level Warning Switch Cir-
cuit
CIRCUIT DESCRIPTION
The brake fluid level warning switch sends appropriate signals to the ECU when the brake fluid level is low-
ered.
HINT:
Depressing the parking brake pedal turns on the brake warning light, but this DTC No. C1202/44 is not out-
put.
DTC No.DTC Detecting ConditionTrouble Area
C1202 / 44
Fluid level in the brake master cylinder reservoir tank re-
mains low for 60 sec. or more. This means brake fluid
warning switch likes on.Brake fluid level
Brake fluid level warning switch
Brake fluid level warning switch circuit
WIRING DIAGRAM
DI6O3-01
Page 673 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-291
447 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check brake fluid level.
CHECK:
Check the amount of fluid in the brake reservoir.
NG Check for fluid leakage, repair brake line and
add fluid.
OK
2 Check brake fluid level warning switch (See page BE-53).
NG Replace brake fluid level warning switch.
OK
3 Check for open circuit in all the harness and components connected to brake
fluid level warning light (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 686 of 1897
F07897
48
DI-304
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
460 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that the stop light lights up when the brake pedal is depressed and turns off when the brake pedal
is released.
NG Repair stop light circuit (See page BE-36).
OK
2 Check voltage between terminal STP (48) of ABS & BA & TRAC & VSC ECU and
body ground.
PREPARATION:
Disconnect the connector from the ABS & BA & TRAC & VSC
ECU.
CHECK:
Measure the voltage between terminal 48 of ABS & BA & TRAC
& VSC ECU harness side connector and body ground when the
brake pedal is depressed.
OK:
Voltage: 7.5 - 14 V
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
3 Check for open circuit in harness and connector between terminal STP of ABS &
BA & TRAC & VSC ECU and stop light switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
DI-266).
Page 700 of 1897
DI-318
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
474 Author: Date:
2001 AVALON (RM808U)
DTC Non Code Translate ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Non CodeTranslate ECU internal malfunction is detected.
Tc terminal circuit
Brake warning light circuit
Translate ECU
INSPECTION PROCEDURE
1 Check the BRAKE warning light circuit (See page DI-330).
NG Repair or replace the BRAKE warning light cir-
cuit.
OK
2 Check the Tc terminal circuit (See page DI-342).
NG Repair or replace the Tc terminal circuit.
OK
Check and replace Translate ECU.
DI6OF-04
Page 705 of 1897
F09806
ABS & BA &
TRAC & VSC ECU
A20 E1
EB
T5TC 84
LG-R
4A
4B 4H
4A6
19
196 LG-R
LG-R
LG-R 21
TC Translate ECU
W-B311LG-R D1
DLC1
TC22
II2 3A 3G4 13
LG-R D2
DLC2
E1 TC
4J/B No. 3 J/B No. 4
F10163
DLC2
Tc E
1DLC1
TcON
DI-342
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
498 Author: Date:
2001 AVALON (RM808U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting between terminals Tc and E1 of the DLC1 or the DLC2 causes the ECU to display DTC by blink-
ing the ABS warning light, VSC warning light and BRAKE warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Tc and E
1 of or
DLC1 or terminal Tc of DLC2 and body ground.
OK:
Voltage: 10 - 14 V
OK If each warning light does not blink even after Tc
and E
1 are connected, the ECU may be defec-
tive.
NG
DI6OO-01