Toyota Yaris: Front Radar Sensor System / Precaution

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Front Radar Sensor System / Precaution

PRECAUTION

PRECAUTIONS FOR FRONT RADAR SENSOR SYSTEM

(a) The millimeter wave radar sensor assembly may not be able to reliably detect the following objects:

Pylons made from plastic, etc., glass surfaces such as the entrance to a convenience store, low to the ground objects such as curbs, etc.
Persons or objects laying down
Pedestrians, bicycles, motorcycles, trees, animals, walls, etc.

(b) The millimeter wave radar sensor assembly may not able to detect obstacles or accurately measure the distance, angle or speed of obstacles in the following situations:

When the preceding vehicle or vehicles travelling in another lane splashes water or kicks up snow at the front of the vehicle
When the rear end of the preceding vehicle is small (such as an empty trailer)
When the posture of the vehicle has changed greatly due to modifications or overloading
When there is adhesion of raindrops or snow on the front surface of the sensor or on the front or rear surfaces of the radar sensor cover
When driving in bad weather (rain, fog, snow, sandstorms, etc.)
When the front grille or radar sensor cover has been subjected to an impact
When an impact has resulted in deformation of the front grille or radar sensor cover, or a change to the installation condition of the millimeter wave radar sensor assembly
When a vehicle cuts closely in front of the vehicle, or when a two-wheeled vehicle is being driven close by
When a non-genuine radar sensor cover is installed
When an accessory, such as bull bars, a grille guard, etc., which interferes with millimeter radio waves is installed in front of the millimeter wave radar sensor assembly
When the radar sensor cover has been painted, coated, or covered with a sticker

(c) The sensor may mistakenly detect signs over the road, structures such as traffic lights, ceilings of tunnels, steel plates on the road, high bridges, bridge seams, manholes, cat's eyes, gutters, bottles, cans, etc.

(d) The sensor may mistakenly detect vehicles driving around curves nearby and vehicles driving in the distance as though they are driving in the same lane as the vehicle.

(e) The sensor may make mistakenly detect or fail to detect objects when driving in an environment where there are many reflective objects around, such as a tunnel.

(f) The following objects may hinder the sensor's ability to detect objects. Therefore, always make sure that the radar sensor cover and the front of the millimeter wave radar sensor assembly are kept clean.

Mud, insects, oil, etc.
Snow
Metal film (aluminum foil, candy wrappers that have a metallic coating, etc.)

PRECAUTIONS WHEN REPLACING MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Millimeter wave radar sensor assembly dirt detection function:

The millimeter wave radar sensor assembly is equipped with a function to detect dirt on the front of the sensor, however depending on conditions, dirt on the front surface of the sensor or on the front or rear surface of the radar sensor cover may not always be detected.
The dirt detection function may not operate if there is a metal object or metallic coated plastic bag tightly adhered to the sensor or cover.
The dirt detection function may not operate if ice or icicles are attached to the sensor or cover.

(b) Do not apply excessive force to the millimeter wave radar sensor assembly or subject it to a strong impact.

(d) Do not reuse a millimeter wave radar sensor assembly that has been dropped or subjected to a strong impact.

(e) When replacing the millimeter wave radar sensor assembly, try to avoid touching any part of it other than the mounting portions and the edges.

(f) If the front bumper or front grille has been subjected to an impact, the system may not operate correctly due to damage to the millimeter wave radar sensor assembly or misalignment of the beam axis.

(g) Do not modify, paint or replace the radar sensor cover and other parts around the millimeter wave radar sensor assembly.

(h) Do not attach stickers, including transparent stickers, or other accessories to the millimeter wave radar sensor assembly, the radar sensor cover, or the surrounding area.

(i) Do not subject the radar sensor cover to any strong impacts.

(j) Before getting in the vehicle, clean away any dirt adhering to the surface of the radar sensor cover.

(k) Do not modify the vehicle or change its height and posture.

(l) Do not remove the label from the millimeter wave radar sensor assembly.

REPLACEMENT PRECAUTIONS

(a) Millimeter wave radar sensor assembly:

When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
When the millimeter wave radar sensor assembly has been replaced with a new one, it is necessary to perform millimeter wave radar sensor assembly beam axis alignment and to clear the vehicle control history. Before performing the Driving Adjustment, make sure to read Before Starting Driving Adjustment.
HINT:

Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.

Triangle Target: Click here

Flat Surface Target: Click here

Driving Adjustment: Click here
When replacing the millimeter wave radar sensor assembly, always check that ECU security key is registered.
Click here

Front Radar Sensor System

Parts Location

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