2003 LEXUS LS430 trailer

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.).
INSPECTION PROCEDURE
1.ADJUST LASER SENSOR (SEE ADJUSTMENT
)
HINT:
It is necessary to make the ECM recognize spec information (whether the vehicle is equipped with the
dynamic laser or not). When this procedure has not been carried out, this DTC may be output.
1. Clear the DTC and then recheck for DTCs.
OK: DTC is not output.
HINT:
If DTC P1570 is still output after performing the above procedures, replace the laser sensor.
NG: REPLACE LASER SENSOR (SEE REPLACEMENT
)
OK: SYSTEM OK
CIRCUIT DESCRIPTION
This DTC is output when the scanning angle of the laser sensor is incorrect.
This DTC is also output when the laser sensor optical axis is in an incorrect position is detected.
DTC P1572 PROBLEM SYMPTOM DIAGNOSTIC

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