Lexus NX: Precaution

Lexus NX 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 raindrops or snow is stuck on the front of the sensor or on the front or back of the front grille emblem
When driving in bad weather (rain, fog, snow, sandstorms, etc.)
When the front grille or front grille emblem has been subjected to a strong impact
When the front grille emblem is damaged as a result of an impact, or the installation condition of the millimeter wave radar sensor assembly has changed
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 front grille emblem 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 front grille emblem and its surrounding area has been painted or is 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 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 front grille emblem 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 can automatically detect dirt on the sensor surface or the front or back surface of the front grille emblem, however, dirt may not always be detected.
The dirt detection function may not operate if a metal object or plastic sheet with metal coating is attached to the sensor or the front grille emblem.
The dirt detection function may not operate if there is snow or ice on the sensor or the front grille emblem.

(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) 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.

(f) Do not modify, paint or replace the front grille emblem and other parts around the millimeter wave radar sensor assembly.

(g) Do not attach accessories or stickers to the millimeter wave radar sensor assembly, front grille emblem or its surrounding area.

(h) Do not apply excessive force to the front grille emblem or subject it to strong impact.

(i) Keep the front grille emblem clean.

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

(k) 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 adjustment and front radar acceleration sensor calibration, and to clear the vehicle control history.
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(b) Forward recognition camera:

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and a DTC may be stored.
If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, forward recognition camera adjustment must be performed.
HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

One Time Recognition:

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Sequential Recognition:

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