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05-2018
                                                 DIAGNOSTICS        -   DYNAMIC LASER CRUISE CONTROL SYSTEM          05BEA-03




    DTC            P1570/73 LASER RADAR SENSOR MALFUNCTION

CIRCUIT DESCRIPTION
The laser radar sensor emits laser beams towards the front object, and it measures a distance and direction
of the object by receiving the beam reflections. Based on the reflections, the sensor calculates the relative
speed. These data are transmitted to the distance control ECU.
   DTC No.                           Detection Item                                                   Trouble Area
             S The ECM outputs a malfunction code when it detects the
               communication error signal from the distance control ECU to
  P1570/73                                                                     S Laser radar sensor
               the laser radar sensor for 0.15 sec. or more while the dynam-
               ic laser cruise control is in operation.

HINT:
The laser radar monitors the laser emission and reception by itself. When it cannot monitor, this DTC is de-
tected.
When rain drops or snowflakes strike the windshield, the distance between the front vehicle 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 front vehicle and may not properly maintain the
correct vehicle-to-vehicle distance.
 S    The front vehicle is tall a trailer.
 S    The back of the front vehicle is extremely dirty.
 S    The exhaust from the front vehicle or from other lanes is heavy.
 S    The front vehicle has no reflector.
 S    The laser radar sensor is facing bright light (sunlight).
INSPECTION PROCEDURE
   1      REPLACE LASER RADAR SENSOR (See page 82-2 )




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                                  Author :                 Date :      2201

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