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DI-339
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI8AZ-01
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
S 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.
S 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 E1 of the DLC1 or
Tc and CG of the DLC3 to make BRAKE warning light blink and output the DTC.
WIRING DIAGRAM
Active Light Relay Skid Control ECU
32
4 8 R-W
E EBDW V14 EBDW
BRL
Translate ECU
3
J8 15 16
J/C PKB T10 Y-G
16 V14 PKB
R R
T10 BRL 25 40
D D GR-G
2 LBL T10 V14 LBL
BR D
T10 PKB2 11
LVL2 T10
R R-W Brake Fluid Level
ED Warning Switch
Y-R
1 2
Combination Meter J/B No. 3 P3
Parking Brake Switch W-B
9 5 8 9
Y-R
C10 C9 3B 3B A
1
J3
BRAKE
GR J18 J17 Driver Side J/B No. 1 J/C
I12
J/C J/C 2 10A GAUGE 1 Ignition Switch
GR GR B-Y J2
1D 1K
D A A 4 2 A
D
W-L
Fusible Link Block Engine Room J/B No. 2 Driver Side J/B No. 1
FL Main 2 1 W-B
2 40A AM1 2
B-L 140A 100A W W
2D 2L 1B 1K
1 ALT INP 4 1 2
Battery IJ
F13459
2001 SIENNA (RM787U)
Author : Date : 493
DI-340
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-48 ).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-48 ).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output ?
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 bulb or combination meter.
OK
2001 SIENNA (RM787U)
Author : Date : 494
DI-341
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
5 Check for open or short circuit in harness and connector between combination
meter and active lamp relay (See page IN-31 ).
NG Repair or replace harness or connector.
OK
6 Check for open or short circuit in harness and connector between active lamp
relay and skid control ECU (See page IN-31 ).
NG Repair or replace harness or connector.
OK
7 Check active lamp relay.
In case in which the BRAKE warning light does not light up:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the BRAKE warning light goes on.
In case in which the BRAKE warning light remains on:
PREPARATION:
32 83
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Using service wire, connect terminal EBDW (32) and
GND (83) of skid control ECU.
(d) Turn the ignition switch ON.
CHECK:
F14392 Check the BRAKE warning light goes off.
NG Replace active lamp relay.
OK
Check and replace skid control ECU.
2001 SIENNA (RM787U)
Author : Date : 495
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