2003 LEXUS LS430 ignition

Fig. 31: Connecting Hand-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Checking DTCs.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Read the DTCs following the prompts on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.
2.DTC CHECK (USING SST CHECK WIRE)
a. Checking DTCs of ABS system.
1. Using SST, connect terminals TC and CG of the DLC3.
SST 09843-18040
2. Turn the ignition switch to the ON position.
3. Read the DTC from the ABS warnin
g light on the combination meter.

SST 09843-18040
2. Turn the ignition switch to the ON position.
3. Read the DTC from multi-information display on the combination meter.
HINT:
At this time, "VSC OK", is displayed when VSC system is in normal condition. If any DTC is
detected, "VSC 31", for example, will be displayed.
If there are 2 or more DTC, DTC will be displayed in ascending order of the number.
If no code appears, inspect the VSC warning information circuit and TC and CG terminal circuit.
Fig. 34: Identifying VSC Position

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TROUBLE AREA REFERENCE
Trouble AreaSee Procedure
TC and CG terminal circuitTC AND CG TERMINAL CIRCUIT

3.CLEAR DTC (USING HAND-HELD TESTER)
a. Clearing the DTCs.
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Operate the hand-held tester to clear the codes.
HINT:
Refer to the hand-held tester operator's manual for further details.
Fig. 35: Connecting Hand
-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.CLEAR DTC (USING SST CHECK WIRE)
a. Clear the DTCs using the SST check wire.
1. Using SST, connect terminals TC and CG of the DLC3.
2. Turn the i
gnition switch to the ON position.
VSC warning information circuitVSC WARNING LIGHT CIRCUIT (REMAINS ON)

Fig. 37: Identifying Brake Pedal Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5.END OF CHECK/CLEAR
a. Turn the ignition switch to the ON position
b. Check that the ABS warning lamp go off within approximately 3 seconds.
c. Check that "VSC" does not appear on the multi information display.
1.FREEZE FRAME DATA
HINT:

Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle
(sensor) state as freeze frame data.
The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned
from off to the ON position since the last time ABS was activated. However, if the vehicle was stopped or
at low speed (4.3 mph (7 km/h) or less), or if a DTC is detected, the skid control ECU will not count the
number after that.
Freeze frame data at the time the ABS operates:
The skid control ECU stores and updates data whenever the ABS system operates.
When the ECU stores data at the time a DTC is detected, the data stored when the ABS operated is
erased.
Freeze frame data at the time a DTC is detected:
When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until
the data is cleared.
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. From the display on the tester, select the "FREEZE FRAME DATA".

Fig. 38: Freeze Frame Data
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.FAIL SAFE OPERATION
FAIL-SAFE CHART
HINT:
A malfunction in either the ABS or BA system will result in identical operation, with ABS, BA, EBD,
TRAC, and VSC system control prohibited.
If control is prohibited due to a malfunction during operation, control will be disabled gradually. This is
to avoid sudden vehicle instability.
HINT:
With the hand-held tester connected to the DLC3 and the ignition switch in the ON position, the ABS, TRAC
and VSC data list can be displa
yed. Follow the prompts on the tester screen to access the DATA LIST.
MalfunctionSymptom
ABS systemProhibit the ABS, BA, TRAC, and VSC control
BA systemProhibit the ABS, BA, TRAC, and VSC control
EBD systemProhibit the EBD, ABS, BA, TRAC and VSC control
TRAC systemProhibit the TRAC and VSC control
VSC systemProhibit the TRAC and VSC control

HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay and actuator, etc. to operate without
removing any parts. Performing the ACTIVE TEST as the first step of troubleshooting is one of the methods to
shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. According to the display on the tester, perform the "ACTIVE TEST
".
HINT:
Ignition switch must be turned to the ON position to proceed to the Active Test using the hand-held tester.
VEHICLE CONDITION / TEST DETAILS
ItemVehicle Condition / Test DetailsDiagnostic Note
SFRRTurns ABS solenoid (SFRR) ON / OFFOperation of solenoid (clicking sound)
can be heard
SFRHTurns ABS solenoid (SFRH) ON / OFFOperation of solenoid (clicking sound)
can be heard
SFLRTurns ABS solenoid (SFLR) ON / OFFOperation of solenoid (clicking sound)
can be heard
SFLHTurns ABS solenoid (SFLH) ON / OFFOperation of solenoid (clicking sound)
can be heard
SRRRTurns ABS solenoid (SRRR) ON / OFFOperation of solenoid (clicking sound)
can be heard
ItemVehicle Condition / Test DetailsDiagnostic Note
SRRHTurns ABS solenoid (SRRH) ON / OFFOperation of solenoid (clicking sound)
can be heard
SRLRTurns ABS solenoid (SRLR) ON / OFFOperation of solenoid (clicking sound)
can be heard
SRLHTurns ABS solenoid (SRLH) ON / OFFOperation of solenoid (clicking sound)
can be heard
SFRR & SFRHTurns ABS solenoid SFRR & SFRH
ON / OFFOperation of solenoid (clicking sound)
can be heard
SFLR & SFLHTurns ABS solenoid SFLR & SFLH
ON / OFFOperation of solenoid (clicking sound)
can be heard
SRH & SRRTurns ABS solenoid SRH & SRR ON /
OFFOperation of solenoid (clicking sound)
can be heard
SRLR & SRLHTurns ABS solenoid SRLR & SRLH
ON / OFFOperation of solenoid (clicking sound)
can be heard
SFRH & SFLHTurns ABS solenoid SFRH & SFLH
ON / OFFOperation of solenoid (clicking sound)
can be heard

OK: Go to next step
The same DTC is recorded.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The ABS motor relays consist of 2 relays are included in the engine room No.3 R/B.
The ABS cut relay is turned on after turning the ignition switch to the ON position. If the DTCs in the
ABS pump motor circuit are memorized, the ABS cut relay cuts off the power supply to the ABS motor
relay and performs the fail safe.
While any of the ABS, BA, TRAC and VSC is operating, the skid control ECU (included in the actuator)
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If the voltage applied to the ABS motor relays (+BM) drops below the condition that detects the DTCs
due to the shorta
ge of the battery or alternator output, the DTCs may be memorized.