Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL

DESCRIPTION

INSPECTION PROCEDURE

ADJUST MILLIMETER WAVE RADAR SENSOR

DTC P1570 Radar Sensor Malfunction

DESCRIPTION

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 millimeter wave circuit activation by itself. This DTC is output when one of the following occurs: 1) the monitor is malfunctioning, 2) an EEPROM error is detected, 3) a voltage error is detected, and 4) the radar sensor is not adjusted. When raindrops or snowflakes strike the millimeter wave 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 beam reflections from 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:

INSPECTION PROCEDURE

• NOTICE:

• When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed .

Refer to adjustment .

• HINT:

• It is necessary to make the ECM recognize specification information (whether the vehicle is equipped with the dynamic radar cruise control system or not). When this procedure has not been carried out, this DTCs may be output.