2003 LEXUS LS430 warning light

*2:
1. Keep the vehicle in the stationary condition for 5 seconds or more and depress the brake pedal
lightly 2 or 3 times.
2. Drive the vehicle at the vehicle speed of 31 mph (50 km/h) and keep depressing the brake pedal
strongly for approximately 3 seconds.
3. Repeat the above operation 3 times or more and check that the ABS warning light goes off.
4. Clear the DTC (see DTC CHECK/CLEAR
).
HINT:
In some cases, the hand-held tester cannot be used when ABS warning light remains on.
DTC chart of VSC:
Fig. 43: DTC Information Chart Of VSC

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
In some cases, the hand-held tester cannot be used when VSC warning light is always on.

During DTC read by SST (Check Wire), if the ABS warning light remains on, trouble shoot by following this
inspection flow.
WIRING DIAGRAM
Fig. 112: ABS Warning Light Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 115: ABS Warning Light Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT CAN COMMUNICATION SYSTEM

a. Is the DTC output for CAN communication system?
Result:
DTC OUTPUT DESCRIPTION
B: REPAIR CAN COMMUNICATION SYSTEM (SEE PRECAUTION
)
A: Go to next step
2.INSPECT MULTIPLEX COMMUNICATION SYSTEM
a. Is the DTC output for Multiplex communication system?
Result:
DTC OUTPUT DESCRIPTION
B: REPAIR MULTIPLEX COMMUNICATION SYSTEM (SEE DIAGNOSTIC TROUBLE
CODE CHART )
A: Go to next step
3.INSPECT ABS WARNING LIGHT
a. Connect the hand-held tester to the DLC3 and start the engine.
b. Select the item "ABS WARN LIGHT" in the ACTIVE TEST and operate the ABS warning light on
the hand-held tester.
VEHICLE CONDITION / TEST DETAILS
c. Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by
the hand-held tester.
Standard:
Turn the ABS warning light ON or OFF in accordance with the hand-held tester.
NG: CHECK AND REPAIR ABS WARNING LIGHT CIRCUIT
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
DTC is not outputA
DTC is outputB
DTC is not outputA
DTC is outputB
ItemVehicle Condition / Test DetailsDiagnostic Note
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination meter

CIRCUIT DESCRIPTION
If the ECU stores DTC, the VSC warning light comes on in the combination meter.
The skid control ECU is connected to the combination meter via CAN and MPX communications.
WIRING DIAGRAM

Fig. 116: VSC Warning Light Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK DTC
a. Is DTC output for ABS, VSC, CAN and/or MPX?

Fig. 118: Identifying Skid Control ECU Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
If the ECU stores DTC, the VSC warning light comes on in the combination meter.
The skid control ECU is connected to the combination meter via CAN and MPX communications.
WIRING DIAGRAM

Fig. 119: VSC Warning Light Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT CAN COMMUNICATION SYSTEM
a. Is the DTC output for CAN communication s
ystem?