2003 LEXUS LS430 warning

1.DIAGNOSIS
FL+ (S42-18) - FL-
(S42-4)P -VFront LH wheel speed
signal inputIG switch ON, slowly turn
left front wheelAC generation
RL+ (S42-20) - RL-
(S42-6)BR-W -
BRRear LH wheel speed signal
inputIG switch ON, slowly turn
left rear wheelAC generation
TS (S42-24) -GND
(S42-1, 32)B - BR,
W-BSensor check inputIG switch ON11 to 14 V
STP (S42-27) -
GND (S42-1, 32)G-W - BR,
W-BStop lamp switch inputStop light switch ON
(Brake pedal pushed)8 to 14 V
STP (S42-27) -
GND (S42-1, 32)G-W - BR,
W-BStop lamp switch inputStop light switch OFF
(Brake pedal released)Below 1.5 V
PKB (S42-28) -
GND (S42-1, 32)B-L - BR,
W-BParking brake switch inputIG switch ON, parking
brake switch ONBelow 1.5 V
PKB (S42-28) -
GND (S42-1, 32)B-L - BR,
W-BParking brake switch inputIG switch ON, parking
brake switch OFF11 to 14 V
BZ (S42-30) -GND
(S42-1, 32)W-R - BR,
W-BBuzzer outputIG switch ON, VSC
buzzer soundsBelow 1.0 <-->
11 to 14 V
BZ (S42-30) -GND
(S42-1, 32)W-R - BR,
W-BBuzzer outputIG switch ON, VSC
buzzer does not sound11 to 14 V
+BS (S42-31) -
GND (S42-1, 32)B - BR,
W-BSolenoid relay power supplyAlways11 to 14 V
FRO (S42-37) -
GND (S42-1, 32)Y-R - BR,
W-BFront RH wheel speed
signal outputVehicle drives at approx.
12 mph (20 km/h)Pulse generation
FLO (S42-38) -
GND (S42-1, 32)Y-B - BR,
W-BFront LH wheel speed
signal outputVehicle drives at approx.
12 mph (20 km/h)Pulse generation
INIT (S42-41) -
GND (S42-1, 32)GR-R -
BR, W-BThe pressure warning
standardization switch InputIG switch ON, The
pressure warning switch
ON
Below 1.5 V
INIT (S42-41) -
GND (S42-1, 32)GR-R -
BR, W-BThe pressure warning
standardization switch InputIG switch ON, The
pressure warning switch
OFF
11 to 14 V
WFSE (S42-42) -
GND (S42-1, 32)LG-B -
BR, W-BWFSE inputIG switch ON11 to 14 V
CSW (S42-43) -
GND (S42-1, 32)Y-G - BR,
W-BTRAC cut switch InputIG switch ON, TRAC
OFF switch is off11 to 14 V
CSW (S42-43) -
GND (S42-1, 32)Y-G - BR,
W-BTRAC cut switch InputIG switch ON, TRAC
OFF switch is onBelow 1.5 V
R+ (S42-45) -GND
(S42-1, 32)R-W - BR,
W-BPower supply for motor
relayIG switch ON11 to 14 V
IG1 (S42-46) -GND
(S42-1, 32)B-R - BR,
W-BIG1 power supplyIG switch ON11 to 14 V

a. If the skid control ECU detects a malfunction, the ABS, BRAKE, VSC warning (Multi-information
display) and TRAC OFF indicator light will come on in accordance with the trouble area to warn
the driver.
The table below indicates which lights come on when there is a malfunction in a particular function.
Fig. 30: Identifying ABS, BRAKE, VSC warning Lights

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TROUBLE AREA DESCRIPTION
BA (Brake

xcirc: Light ON
-: Light OFF
The DTCs are simultaneously stored in memory. The DTCs can be read by connecting the hand-
held tester.
This system has a sensor signal check function (Test Mode).
The DTC can be read by connecting the SST between terminals TS and CG of DLC3 and observing the
blinking of the ABS warning light and VSC information, or by connecting the hand-held tester.
1.DTC CHECK (USING HAND-HELD TESTER)
Item / Trouble AreaABSEBDAssist)TRACVSC
ABS Warning Light000--
Brake Warning Light-0---
TRAC OFF Indicator Light00000
VSC Warning (Multi Information
Display)00000

HINT:
If no code appears, inspect the diagnostic circuit or ABS warning light circuit.
Fig. 32: Identifying DLC3 Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TROUBLE AREA DESCRIPTION
As an example, the blinking patterns for a normal system code and trouble codes 11
and 21 are shown on the left.
4. Codes are explained in the code table DIAGNOSTIC TROUBLE CODE CHART
.
5. After completing the check, disconnect terminals TC and CG of the DLC3, and turn off the
display.
If 2 or more DTCs are detected at the same time, the DTCs will be displayed in assenting order.
Trouble AreaSee Procedure
TC and CG terminal circuitTC AND CG TERMINAL CIRCUIT
ABS warning light circuitABS WARNING LIGHT CIRCUIT (REMAINS ON)

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)

SST 09843-18040
Fig. 36: Identifying DLC3 Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Clear the DTCs stored in the ECU by depressing the brake pedal 8 times or more within 5 seconds.
4. Check that the ABS warning light indicates a normal system code.
5. Remove the SST.
HINT:
Clearin
g the DTCs cannot be performed by removing the battery cable or the ECU-IG fuse

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: