DTC P1570: Radar Sensor Malfunction: Description

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

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).

DTC DETECTION CONDITION TABLE

DTC No.	DTC Detection Condition	Trouble Area
P1570	The ECM detects a laser sensor malfunction signal for 0.15 sec. or more while the dynamic laser cruise control is in operation	Laser sensor

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.
Emission from the vehicle in front or vehicles in other lanes is heavy.
The vehicle in front has no reflector.
The laser sensor is receiving a strong flash of light (sunlight, etc.)