Toyota Sequoia (2005). Manual — part 308
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–1027
1221
VSC TRAC Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
If the ECU stores a DTC to shut down VSC & TRAC operation, the VSC TRAC warning light on the combina-
tion meter come on.
DI945–03
F19778
ABS & VSC Actuator
(Skid Control ECU)
VSCW
44
S1
P–L
IL2
3
P–L
3
C6
Combination SW
Instrument Panel J/B
11
1H
B–O
24
2
1C
IGN1
B–R
I18
Ignition SW
IG2
AM2
IG1
AM1
3
1C
6
1C
4
1C
7
1J
1
1L
4
1F
AM1
ECU–IG
1
2
2
6
5
1
W–R
W–L
B–Y
W–R
W
B
B
1
2C
1
2D
B–R
Sub J/B No.3
8
3A
8
3C
B–R
B–R
B–R
B–R
W–B
A
J37
A
J38
A
J37
1
IL1
13
S1
IG1
IG1
GND
1
40
O
O
A
A
A
A
W–B
W–B
W–B
J18
J/C
J43
J/C
17
IL1
9
IL1
1
S1
GND1
GND2
32
S1
IG
IG
W
B
B
5
8
4
ALT
F10
Fusible
Link
Block
Battery
Engine Room J/B
AM2
J/C
T5
Translate ECU
VSC TRAC
7
11
L
W
B–R
L
W
7
IL2
6
S1
6
IL2
2
S1
CANH
CANL
VSC+
VSC–
(*) CAN1 Circuit
(*)
(*)
(*)
(*)
DI–1028
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1222
WIRING DIAGRAM
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–1029
1223
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand–held tester and start from step 2 when not using the
hand–held tester.
1
Check operation of the VSC warning light.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch to the ON position and push the hand–held tester main switch ON.
(c)
Select ACTIVE TEST mode on the hand–held tester.
CHECK:
Check that ”ON” and ”OFF” of the VSC TRAC warning light can be shown on the combination meter with
the hand–held tester.
Item
Vehicle Condition / Test Details
Diagnostic Note
VSC / TRC OFF IND
Turns VSC / TRAC OFF indicator ON / OFF
Observe combination me-
ter
OK:
VSC TRAC warning light operates.
OK
Go to step 5.
NG
2
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the output code
(See page
).
NO
3
Check for open and short circuit in harness and connector between skid control
ECU and VSC TRAC warning light (See page
).
NG
Repair or replace harness or connector.
OK
DI–1030
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1224
4
Check VSC TRAC warning light.
See combination meter troubleshooting on page
NG
Repair combination meter assembly
(See page
OK
Replace skid control ECU
(See page
).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page
).
5
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the output code (See
page
NO
Replace skid control ECU
(See page
).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page
).
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