brake light LEXUS LS430 2003 Factory Service Manual

VEHICLE SPDVehicle speed sensor/min.: 0
km/h (0 mph), max.: 255
km/h (158 mph)Actual vehicle speed-
MEMORY SPDCruise control memorized
speed / min.: 0 km/h (0 mph),
max.: 255 km/h (158 mph)Memorized speed: Cruise control
activated-
THROTTLERequired throttle opening
angle / min.: 0 deg, max.: 125
degRequired throttle opening angle:
Cruise control activated-
RQST TORQUECruise request torque/min.: -
1024 Nm, max.: 1016 Nm--
CRUISE CTRLCruise control system active
condition / ON or OFFON: Cruise control activated
OFF: Cruise control inactivated-
MAIN SW (MAIN)Main SW signal (Main
CPU) / ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed
off)*3
MAIN SW (SUB)Main SW signal (Sub CPU) /
ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed
off)*3
CCS READY MCruise control system
standby condition (Main
CPU) / ON or OFFON <=> OFF: Change ON/OFF
each time Main SW is pushed.*1
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic Note
CCS READY SCruise control system
standby condition (Sub
CPU) / ON or OFFON <=> OFF: Change ON/OFF
each time Main SW is pushed.*1
CCS INDICATOR MCruise indicator signal (Main
CPU) / ON or OFFON: "CCS READY" ON OFF:
"CCS READY" OFF*2
CCS INDICATOR SCruise indicator signal (Sub
CPU) / ON or OFFON: "CCS READY" ON OFF:
"CCS READY" OFF*2
CANCEL SWCANCEL SW signal / ON or
OFFON: CANCEL SW ON OFF:
CANCEL SW OFF-
SET/COAST SWSET/COAST SW signal / ON
or OFFON: SET/COAST SW ON OFF:
SET/COAST SW OFF-
RES/ACC SWRES/ACC SW signal / ON or
OFFON: RES/ACC SW ON OFF:
RES/ACC OFF-
STP LIGHT SW MStop lamp SW signal (Main
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT SW S1Stop lamp SW signal (Sub
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT SW S2Stop lamp SW signal (Sub
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
SHIFT D POSPNP SW signal (D position) /
ON or OFFON: Shift D position OFF:
Except shift D position-

HINT:
If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details of each
code, refer to the DTC chart below.
DIAGNOSTIC TROUBLE CODE CHART
L-CRUISE DISPGraphic area is ON / OFF((1))
L-CRS CHECK IND"CHECK CRUISE SYSTEM" indicator is ON / OFF-
L-CRS READY IND"RADAR READY" indicator is ON / OFF-
(1)The entire graphic area in the combination meter will light up.
DTCDescription
DTC P0500, DTC
P0503
VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION
DTC P0571STOP LIGHT SWITCH CIRCUIT MALFUNCTION
DTC P0607INPUT SIGNAL CIRCUIT MALFUNCTION
DTC P1615, DTC
U1101
COMMUNICATION ERROR FROM DISTANCE CONTROL ECU TO
ECM
DTC P1616, DTC
U0100
COMMUNICATION ERROR FROM ECM TO DISTANCE CONTROL
ECU
DTC P1617DISTANCE CONTROL ECU MALFUNCTION
DTC P1630, DTC
U0122
COMMUNICATION ERROR FROM VSC TO ECM
DTC P1631, DTC
U0100
COMMUNICATION ERROR FROM ECM TO VSC
DTC P1575WARNING BUZZER MALFUNCTION
DTC P1578BRAKE SYSTEM MALFUNCTION
DTC U0235LOST COMMUNICATION WITH CRUISE CONTROL FRONT
DISTANCE RANGE SENSOR
DTC U1102LOST COMMUNICATION WITH RADAR SENSOR
DTC P1570RADAR SENSOR MALFUNCTION
DTC P1572IMPROPER AIMING OF RADAR SENSOR BEAM AXIS
DTC U0126LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE
DTC U0123LOST COMMUNICATION WITH YAW RATE SENSOR MODULE

b. Turn the ignition switch to the ON position, and turn the hand-held tester main switch on.
c. Select the item "STP LIGHT SW M", "STP LIGHT SW S1" or "STP LIGHT SW S2" in the DATA
LIST, and read its value displayed on the hand-held tester.
d. Check that the stop lamp comes on when the brake pedal is depressed, and goes off when the brake
pedal is released.
CC (ECM):
DATA LIST (CC (ECM))
OK: When brake pedal operation is performed the standard values will be above.
NG: Go to step 2
OK: REPLACE ECM (SEE REPLACEMENT
)
2.INSPECT STOP LAMP SWITCH ASSY
a. Disconnect the stop lamp switch assy connector.
b. Measure the resistance according to the value(s) in the table below.
Standard:
STOP LAMP SWITCH TERMINALS RESISTANCE SPECIFICATION
NG: REPLACE STOP LAMP SWITCH ASSY
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic
Note
STP LIGHT
SW MStop lamp SW signal (Main
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT
SW S1Stop lamp SW signal (Sub CPU) /
ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT
SW S2Stop lamp SW signal (Sub CPU) /
ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
Switch conditionTester connectionSpecified value
Switch pin free1 - 2Below 1 ohms
Switch pin free3 - 410 kohms or higher
Switch pin pushed in1 - 210 kohms or higher
Switch pin pushed in3 - 4Below 1 ohms

1.GO TO CAN COMMUNICATION SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
CIRCUIT DESCRIPTION
In the dynamic laser cruise control system, the ECM and the distance control ECU communicate with one
another to control the system based on some designation information. If the designation information of the
ECM and distance control ECU is different from each other, this DTC is recorded.
DTC P1617 PROBLEM SYMPTOM DIAGNOSTIC
INSPECTION PROCEDURE
1.CONFIRM THE DESIGNATION INFORMATION
a. If this DTC is output, confirm the designation information by following the procedures below.
1. Turn the ignition switch to the ON position.
2. Push the ON-OFF button of the cruise main switch on.
3. With the brake pedal depressed, push the cruise control main switch to RES/ACC 3 times
within 3 seconds. Check that the VSC buzzer sounds at this time.
If the light control switch is turned on by mistake, readjust the optical axis (refer to
ADJUSTMENT
for optical axis adjustment).
4. Clear the DTC and then recheck for DTCs.
OK: DTC is not output.
HINT:
If DTC P1617 is still output after performing the above procedures, replace the distance control ECU.
If the DTC P1617 is still output after replacing the distance control ECU, replace the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1617While the dynamic laser cruise control is either
<005300550048005300440055004c0051004a00030049005200550003005200530048005500440057004c005200510003005200550003005200530048005500440057004c0051004a000f0003004c004900030057004b00480003004700480056004c004a00
5100440057004c005200510003[
signal from the ECM and the designation return signal
from the distance control ECU do not match one another
for a certain amount of time or more, the ECM records
this trouble code.Cruise control ECU
(Distance control ECU)

SYSTEM NAME AND PAGE REFERENCE
Keep in mind the following points when inspecting the dynamic radar cruise control system.
As there is a limitation to the vehicle-to-vehicle distance controlling capability, do not overly rely on the
dynamic radar cruise control system.
Do not neglect to pay constant attention to the vehicle-to-vehicle distance and the traffic conditions when
using the dynamic radar cruise control system. Decelerate with the brake pedal, or accelerate with the
accelerator pedal, according to the situation, to keep an appropriate distance with the vehicle in front.
When the vehicle in front decelerates rapidly or another vehicle pulls out in front of the vehicle,
decelerating in time to avoid a collision may not be possible without additional braking.
The dynamic radar cruise control system is designed to assist in maintaining an appropriate distance with
the vehicle in front. However, the system alone is not sufficient. It is imperative that the driver pays
attention at all times.
The millimeter wave radar sensor has functions to automatically detect dirt on the sensor face and inform
the driver, but it is not perfect. Keep the sensor face clean.
The dynamic radar cruise control system does not work, or give vehicle-approaching warning, for
vehicles which are stopped or driving at significantly slower speeds. Always pay attention to those other
vehicles.
The millimeter wave radar sensor detection area is narrow at close range, so detection of a vehicle pulling
out just in front may be delayed, or a motorcycle running on the side of the same lane may not be
detected. The distance to the vehicle in front may not be maintained properly due to these reasons.
Even if ACCEL is operated to increase the set vehicle speed, the vehicle does not accelerate because the
speed is controlled in accordance with the speed of the vehicle in front while driving with the vehicle-to-
vehicle distance control mode on (follow-up cruising). However, as the set vehicle speed has been
increased by ACCEL operation, the vehicle keeps accelerating when there is no vehicle in front. Check
the set speed with the set vehicle speed indication on the display.
The controlled vehicle distance may be shorter than the set vehicle distance when cruising on a long
downhill road.
Push the cruise control main switch ON-OFF button off and reset the cruise control if the master warning
light comes on, the CRUISE main indicator light blinks, and the fail indication is shown on the display
with a "pong" sound during dynamic radar cruise control operation.
The vehicle-approaching warning buzzer does not sound in the constant speed control mode because the
System NameSee Procedure
Front Power Seat Control SystemINITIALIZATION

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:
The ignition switch must be turned to the ON position to proceed to the ACTIVE TEST using the hand-
held tester.
COMBINATION METER ASSY:
ACTIVE TEST DETAIL (COMBINATION METER ASSY)
HINT:
If a trouble code is displayed during the DTC check, check the circuit listed for that code. For details of each
code, refer to the DTC chart below.
DIAGNOSTIC TROUBLE CODE CHART
ItemVehicle Condition / Test DetailsDiagnostic Note
CRUISE INDIC"CRUISE" indicator is ON / OFF-
L-CRUISE DISPGraphic area is ON / OFF((1))
L-CRS CHECK IND"CHECK CRUISE SYSTEM" indicator is
ON / OFF-
L-CRS READY IND"RADAR READY" indicator is ON / OFF-
(1)The entire graphic area in the combination meter will light up.
DTCDescription
DTC P0500, DTC P0503VEHICLE SPEED SENSOR CIRCUIT MALFUNCTION
DTC P0571STOP LIGHT SWITCH CIRCUIT MALFUNCTION
DTC P0607INPUT SIGNAL CIRCUIT MALFUNCTION
DTC P1615, DTC U1101COMMUNICATION ERROR FROM DISTANCE CONTROL ECU
TO ECM
DTC P1616, DTC U0100COMMUNICATION ERROR FROM ECM TO DISTANCE
CONTROL ECU
DTC P1617DISTANCE CONTROL ECU MALFUNCTION
DTC P1630, DTC U0122COMMUNICATION ERROR FROM VSC TO ECM
DTC P1631, DTC U0100COMMUNICATION ERROR FROM ECM TO VSC
DTC P1575WARNING BUZZER MALFUNCTION
DTC P1578BRAKE SYSTEM MALFUNCTION
DTC U0235LOST COMMUNICATION WITH CRUISE CONTROL FRONT
DISTANCE RANGE SENSOR

b. Turn the ignition switch to the ON position, and turn the hand-held tester main switch on.
c. Select the item "STP LIGHT SW M", "STP LIGHT SW S1" or "STP LIGHT SW S2" in the DATA
LIST, and read its value displayed on the hand-held tester.
d. Check that the stop lamp comes on when the brake pedal is depressed, and goes off when the brake
pedal is released.
CC (ECM):
DATA LIST (CC (ECM))
OK: When brake pedal operation is performed, the standard values will be above.
NG: Go to step 2
OK: REPLACE ECM (SEE REPLACEMENT
)
2.INSPECT STOP LAMP SWITCH ASSY
a. Disconnect the stop lamp switch assy connector.
b. Measure the resistance according to the value(s) in the table below.
Standard:
STOP LAMP SWITCH TERMINALS RESISTANCE SPECIFICATION
NG: REPLACE STOP LAMP SWITCH ASSY
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic
Note
STP LIGHT
SW MStop lamp SW signal (Main
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT
SW S1Stop lamp SW signal (Sub CPU) /
ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT
SW S2Stop lamp SW signal (Sub CPU) /
ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
Switch conditionTester connectionSpecified value
Switch pin free1 - 2Below 1 ohms
Switch pin free3 - 410 kohms or higher
Switch pin pushed in1 - 210 kohms or higher
Switch pin pushed in3 - 4Below 1 ohms

INSPECTION PROCEDURE
HINT:
This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication
circuit, one or more DTCs in the CAN communication system is/are output.
1.GO TO CAN COMMUNICATION SYSTEM (SEE PRECAUTION
)
CIRCUIT DESCRIPTION
In the dynamic radar cruise control system, the ECM and the distance control ECU communicate with one
another to control the system based on some designation information. If the designation information of the
ECM and distance control ECU is different from each other, this DTC is recorded.
DTC P1617 PROBLEM SYMPTOM DIAGNOSTIC
INSPECTION PROCEDURE
1.CONFIRM THE DESIGNATION INFORMATION
a. If this DTC is output, confirm the designation information by following the procedures below.
1. Turn the ignition switch to the ON position.
2. Push the ON-OFF button of the cruise main switch on.
3. With the brake pedal depressed, push the cruise control main switch to RES/ACC 3 times
within 3 seconds. Check that the VSC buzzer sounds at this time.
If the light control switch is turned on by mistake, readjust the optical axis (refer to
ADJUSTMENT
for optical axis adjustment).
DTC NO.DTC Detecting ConditionTrouble Area
P1617While the dynamic radar cruise control is either
preparing for
operation or operating, if the designation signal from
the ECM
and the designation return signal from the distance
control
ECU do not match one another for a certain amount
of time or
more, the ECM records this trouble codeCruise control ECU (Distance
control ECU)

SOLENOIDS & SOLENOID VALVES LOCATION
SWITCHES LOCATION
Washer Level SensorOn washer fluid reservoir, below left headlight. See
Fig. 15
.
Yaw Rate SensorBelow rear of center console. See Fig. 18 .
ComponentLocation
Camshaft Timing Oil Control Valve LHOn front of left cylinder head. See Fig. 12 .
Camshaft Timing Oil Control Valve RHOn front of right cylinder head. See Fig. 12 .
Electronically Controlled Transmission SolenoidOn left side of transmission. See Fig. 12 .
Front Height Control ValveOn right front of engine compartment. See Fig. 13 .
Heated Control Exhaust ValveRight front of vehicle, behind bumper. See Fig. 13 .
PPS SolenoidOn left front of engine compartment. See Fig. 15 .
Rear Height Control ValveNear front of engine compartment. See Fig. 29 .
Rear Magnetic ValveIn rear luggage compartment. See Fig. 29 .
Tension Reducer Solenoid LHNear base of left "B" pillar. See Fig. 30 .
Tension Reducer Solenoid RHNear base of left "B" pillar. See Fig. 30 .
VSV (ACIS)On right rear of engine. See Fig. 15 .
VSV (Canister Closed Valve)On right side of engine compartment. See Fig. 15 .
VSV (EVAP)On left rear of engine. See Fig. 15 .
VSV (Pressure Switching Valve)Below right rear of vehicle. See Fig. 30 .
ComponentLocation
Brake Fluid Level Warning SwitchOn brake master cylinder reservoir. See Fig. 12 .
Brake Pedal Load Sensing SwitchOn brake pedal bracket, above brake pedal. See Fig.
2 .
Buckle SW Front LHInside of left front seat belt buckle. See Fig. 31 .
Buckle SW Front RHInside of right front seat belt buckle. See Fig. 31 .
Climate Control Seat SW (Rear)In rear seat assembly. See Fig. 32 .
Door Courtesy SW Front LHAt left "B" pillar. See Fig. 19 .
Door Courtesy SW Front RHAt right "B" pillar. See Fig. 19 .
Door Courtesy SW Rear LHAt left "C" pillar. See Fig. 19 .
Door Courtesy SW Rear RHAt right "C" pillar. See Fig. 19 .
Door Key Lock Motor & Door Unlock Detection
SW Front RHIn right front door. See Fig. 19 .
Door Key Lock & Unlock SW & Door Lock Motor
& Door Unlock Detection SW Front LHIn driver's door. See Fig. 19 .
Door Lock Motor & Door Unlock Detection SW

MISCELLANEOUS LOCATION
Rear LHIn left rear door. See Fig. 19 .
Door Lock Motor & Door Unlock Detection SW
Rear RHIn right rear door. See Fig. 19 .
Engine Hood Courtesy SWNear hood latch, on front center of engine
compartment. See Fig. 12
.
Head Rest Limit SW Rear LHIn rear seat assembly. See Fig. 32 .
Head Rest Limit SW Rear RHIn rear seat assembly. See Fig. 32 .
Luggage Compartment Door Key Unlock SWIn luggage compartment. See Fig. 28 .
Luggage Electrical Key SWIn luggage compartment decklid. See Fig. 28 .
Oil Pressure SwitchOn lower left front of engine. See Fig. 15 .
Parking Brake SwitchBehind left end of dash, on parking brake
mechanism. See Fig. 17
.
Park/Neutral Position SwitchOn right side of transmission. See Fig. 15 .
Power Seat Control SW (Rear Seat)Left side of rear seat. See Fig. 32 .
Pressure SwitchLower left side of dash. See Fig. 17 .
Rear Armrest Courtesy SWIn rear seat. See Fig. 32 .
Rear Sunshade SW (Rear)In center of rear seat. See Fig. 32 .
Stoplight SwitchAbove brake pedal, on bracket. See Fig. 18 .
ComponentLocation
A/C AmplifierIn luggage compartment. See Fig. 4 .
Airbag Squib (Front Passenger Airbag Assembly)Right side of dash. See Fig. 2 .
Airbag Squib (Steering Wheel Pad)In steering wheel. See Fig. 2 .
Curtain Shield Airbag Squib LHLeft "C" pillar. See Fig. 19 .
Curtain Shield Airbag Squib RHRight "C" pillar. See Fig. 19 .
Data Link Connector 3Below left side of dash. See Fig. 16 .
Door Oscillator Front LHIn left front door. See Fig. 19 .
Door Oscillator Front RHIn right front door. See Fig. 19 .
Door Oscillator Rear LHIn left rear door. See Fig. 19 .
Door Oscillator Rear RHIn right rear door. See Fig. 19 .
GeneratorRight front of engine. See Fig. 13 .
Horn (High)On center radiator support. See Fig. 13 .
Horn (Low)On center radiator support. See Fig. 13 .
Ignition Coil & Ignitor No. 1Above No. 1 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 2Above No. 2 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 3Above No. 3 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 4Above No. 4 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 5Above No. 5 spark plug. See Fig. 14 .
Ignition Coil & Ignitor No. 6Above No. 6 spark plug. See Fig. 14 .