2003 LEXUS LS430 tow

Fig. 66: Signal Waveform Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE LASER SENSOR (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The laser sensor emits laser beams towards an object in front and measures the distance and direction of the
object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed
between your own vehicle and on object in front. This data is transmitted to the cruise control ECU (distance
control ECU).
DTC P1570 PROBLEM SYMPTOM DIAGNOSTIC
HINT:
DTC No.Detection ItemTrouble Area
P1570The ECM outputs this trouble code when it detects the communication
error signal (from the cruise control ECU (distance control ECU) to the
laser sensor) for 0.15 sec. or more while the dynamic laser cruise control
is in operation.laser sensor

CIRCUIT DESCRIPTION
This circuit provides power to operate the laser sensor.
The laser sensor emits laser beams towards an object in front and measures the distance and direction of the
object by receiving the beam reflections. Based on the reflections, the sensor calculates the difference in speed
between your own vehicle and an object in front. This data is transmitted to the cruise control ECU (distance
control ECU).
HINT:
The laser sensor monitors the laser emission and reception by itself. This DTC is detected when it cannot
monitor.
When rain drops or snowflakes strike the laser sensor face, the distance between the vehicle in front and your
own vehicle cannot be measured correctly.
The dynamic laser cruise control system functions by detecting the reflector of the vehicle directly in front. In
the following cases, the system may not be able to detect the vehicle in front and may not properly maintain the
correct vehicle-to-vehicle distance.
The vehicle in front is a tall trailer.
The back of the vehicle in front is extremely dirty.
Emissions from the vehicle in front or from other lanes are heavy.
The vehicle in front has no reflector.
The laser sensor is receiving a strong flash of light (sunlight, etc.).
WIRING DIAGRAM

CIRCUIT DESCRIPTION
This circuit provides power to operate the millimeter wave radar sensor.
The millimeter wave radar sensor emits radar beams towards an object in front and measures the distance and
direction of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the
difference in speed between your own vehicle and an object in front. This data is transmitted to the cruise
control ECU (distance control ECU).
HINT:
The millimeter wave radar sensor monitors the radar emission and reception by itself. This DTC is detected
when it cannot monitor.
When rain drops or snowflakes strike the radar sensor face, the distance between the vehicle in front and your
own vehicle cannot be measured correctly.
The dynamic radar cruise control system functions by detecting the reflector of the vehicle directly in front.
In the following cases, the system may not be able to detect the vehicle in front and may not properly maintain
the correct vehicle-to-vehicle distance.
The vehicle in front is a tall trailer.
Emissions from the vehicle in front or from other lanes are heavy.
WIRING DIAGRAM

Fig. 5: Removing Front Bumper Cover
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6.REMOVE HEADLAMP CLEANER (FROM MOTOR TO JOINT) HOSE (W/ HEADLAMP
CLEANER)
a. Disconnect the cleaner hose joint from the actuator.
HINT:
Be careful when removing the cleaner hose from the actuator, because washer fluid will spill.
b. Disconnect the cleaner hose from the bumper cover.
7.REMOVE FRONT BUMPER ENERGY ABSORBER
8.REMOVE RADIATOR SUPPORT REINFORCEMENT LOWER
a. Remove the 2 bolts.
b. Unlock the 2 claws and partially remove the reinforcement lower by angling it towards yourself.
HINT:
It is not necessar
y to fully remove the reinforcement lower completely. Partially remove it so that the

Fig. 95: Removing Radiator Support Sub-Assy Upper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
12.REMOVE COOLER CONDENSER ASSY
a. Push down the 2 condenser brackets.
b. Push the radiator toward the engine.
c. Push the condenser toward the radiator and then pull it upward as shown in Fig. 96
.