Lexus ES300 (2002 year). Manual — part 315
F41994
Skid Control ECU
1
BZ
Passenger Side J/B
V11
VSC Warning Buzzer
68
8
6
W
Buzzer
3B
2L
2R
3B
29
S7
5
B-R
P-B
2
From Battery
From Ignition SW
W-B
Driver Side J/B
ECU-IG
IG1 Relay
3
5
2
1
8
2E
2A
2
B-Y
B-G
IA
05-378
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
531
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
VSC BUZZER CIRCUIT
CIRCUIT DESCRIPTION
The skid control buzzer sounds during VSC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1
PERFORM ACTIVE TEST BY HAND-HELD TESTER(SKID CONTROL BUZZER
OPERATION)
(a)
Select the item ”VSC/BR WARN BUZ” in the ACTIVE TEST and operate the skid control buzzer on
the hand-held tester.
(b)
Check that skid control buzzer sounds ”ON” and ”OFF” with the hand-held tester.
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
052B6-03
F02192
1
2
(+)
(-)
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-379
532
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT SKID CONTROL BUZZER ASSY
(a)
Disconnect the skid control buzzer connector.
(b)
Apply battery positive voltage to the terminals 1 and 2 of
skid control buzzer connector, check that the buzzer
sounds.
NG
REPLACE SKID CONTROL BUZZER ASSY
OK
3
CHECK HARNESS AND CONNECTOR(SKID CONTROL BUZZER - SKID
CONTROL ECU)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
F41999
Skid Control ECU
71
TC
19
S7
P-B
D3
DLC3
TC
CG
80
70
Passenger Side J/B
SB
IA
4
13
P-B
3B
3B
3B
3B
21
Driver Side J/B
2L
2R
8
8
W-B
W-B
C52361
Tc
CG
DLC3
05-380
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
533
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
TC TERMINAL CIRCUIT
CIRCUIT DESCRIPTION
Connecting terminals Tc and CG of the DLC3 causes the ECU to display the DTC by flashing the ABS warn-
ing light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
INSPECT DLC3(TC TERMINAL VOLTAGE)
(a)
Turn the ignition switch ON.
(b)
Measure voltage between terminals Tc and CG of DLC3.
OK: 10 - 14 V
OK
NG
052B7-03
C52361
Tc
CG
DLC3
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-381
534
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU ASSY - DLC3, DLC3
- BODY GROUND)
(a)
Check for open and short circuit in harness and connector between terminal Tc of the skid control ECU
and DLC3 (See page
(b)
Check for open circuit in harness and connector between terminal CG of the DLC3 and body ground
(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
3
INSPECT ABS AND VSC WARNING LIGHT
SST
09843-18040
(a)
Using SST, connect the terminals Tc and CG of the DLC3.
(b)
Turn the ignition switch ON.
(c)
Check the ABS and VSC warning right.
OK: Warning light blinking
OK
END
NG
CHECK AND REPLACE SKID CONTROL ECU ASSY
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