Lexus ES300 (2002 year). Manual — part 314
F41992
Skid Control ECU
Combination Meter
6
IND
S7
Engine Room J/B
Driver Side J/B
From
Ignition SW
LG
B-R
IG2
8
5
2O
8
2G
1C
C8
20
7
1C
C7
39
W
B-O
Slip
IF6
8
B-R
05-374
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
527
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
SLIP INDICATOR LIGHT CIRCUIT
CIRCUIT DESCRIPTION
The SLIP indicator blinks during TRAC & 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(SLIP INDICATOR LIGHT
OPERATION)
(a)
Select the item ”SLIP INDI LIGHT” in the ACTIVE TEST and operate the SLIP indicator light on the
hand-held tester.
(b)
Check that ”ON” and ”OFF” of the SLIP indicator light can be shown on the combination meter by the
hand-held tester.
OK
NG
2
CHECK SLIP INDICATOR LIGHT
(a)
Check that the SLIP indicator light is on for 3 seconds soon after ignition switch ON.
OK
END
NG
052A1-03
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-375
528
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
INSPECT COMBINATION METER ASSY(SLIP INDICATOR LIGHT CIRCUIT)
NG
REPAIR OR REPLACE COMBINATION METER
ASSY
OK
4
CHECK HARNESS AND CONNECTOR(COMBINATION METER - SKID CONTROL
ECU ASSY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
F41993
Skid Control ECU
Combination Meter
4
WT
S7
Passenger Side J/B
Engine Room J/B
B-R
Driver Side J/B
TRAC OFF SW
L
W-B
IG2
70
7
8
IA
2L
SB
39
C7
3B
3B
30
4
1C
C8
14
7
CSW
S6
8
1C
LG
W-B
IF6
B-O
8
2G
2O
5
1
8
2R
VSC
OFF
From
Ignition SW
B-R
8
05-376
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
529
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC cut switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for display-
ing DTC. Turn the ignition switch OFF, TRAC control surely comes on when the ignition switch turns ON next
time.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
RECONFIRM DTC(See page
)
A
Normal Code
B
Malfunction Code
B
REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
A
055W7-02
F00052
1
4
(+)
(-)
3 2
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-377
530
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT TRACTION CONTROL SWITCH
(a)
Remove TRAC control switch.
(b)
Disconnect TRAC control switch connector.
(c)
Measure resistance between terminals 1 and 4 of TRAC
control switch when TRAC control switch is on and off.
OK:
TRAC cut switch
Resistance
Pushed in
Continuity
NG
REPLACE TRACTION CONTROL SWITCH
OK
3
CHECK HARNESS AND CONNECTOR(TRACTION CONTROL SWITCH - BODY
GROUND)(See page
)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
4
INSPECT COMBINATION METER ASSY(TRAC OFF INDICATOR LIGHY CIRCUIT)
NG
REPAIR OR REPLACE COMBINATION METER
ASSY
OK
5
CHECK HARNESS AND CONNECTOR(COMBINATION METER - SKID CONTROL
ECU ASSY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
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