2003 LEXUS LS430 light

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

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.

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)

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

HINT:
If a malfunction code is displayed during the DTC check, check the circuit indicated by the table below.
DIAGNOSTIC TROUBLE CODE CHART
SMF (BA-SOL)Turns TRAC solenoid SMF (BA-SOL)
ON / OFFOperation of solenoid (clicking sound)
can be heard
SMRTurns TRAC solenoid SMR ON / OFFOperation of solenoid (clicking sound)
can be heard
SOL RELAYTurns ABS solenoid relay ON / OFFOperation of solenoid (clicking sound)
can be heard
ABS MOT RELAYTurns ABS motor relay ON / OFFOperation of solenoid (clicking sound)
can be heard
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination meter
VSC WARN LIGHTTurns VSC warning light ON / OFFObserve combination meter
VSC / TRC OFF INDTurns VSC / TRC OFF indicator ON /
OFFObserve combination meter
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination meter
BRAKE WRN LIGHTTurns BRAKE warning light ON / OFFObserve combination meter
VSC / BR WARN
BUZTurns VSC / BRAKE warning buzzer
ON / OFFBuzzer can be heard
STP LIGHT RELAYTurns stop light ON / OFFStop light come on
DTCDescription
DTC C0200/31, C0205/32RIGHT/LEFT FRONT SPEED SENSOR
DTC C0210/33, C0215/34RIGHT/LEFT REAR SPEED SENSOR
DTC C0226/21, C0236/22, C0246/23,
C0256/24, C1225/25
SFR/SFL/SRR/SRL/SM SOLENOID CIRCUIT
DTC C0273/13, C0274/14, C1361/91OPEN CIRCUIT IN ABS MOTOR RELAY CIRCUIT,
B+ SHORT CIRCUIT IN ABS MOTOR RELAY
CIRCUIT, SHORT CIRCUIT IN ABS MOTOR FAIL
SAFE RELAY CIRCUIT
DTC C0278/11, C0279/12OPEN/SHORT CIRCUIT IN ABS SOLENOID
RELAY CIRCUIT
DTC C1201/51ENGINE CONTROL SYSTEM MALFUNCTION
DTC C1203/53ECM COMMUNICATION CIRCUIT
MALFUNCTION
DTC C1210/36, C1336/39ZERO POINT CALIBRATION OF YAW
RATE/DECELERATION SENSOR UNDONE
DTC C1223/43ABS CONTROL SYSTEM MALFUNCTION
DTC C1231/31MALFUNCTION IN STEERING ANGLE SENSOR
CIRCUIT