Lexus NX manuals

Lexus NX: Precaution

Lexus NX Service Manual / Engine & Hybrid System / Cruise Control / Road Sign Assist System / Precaution

PRECAUTION

HANDLING PRECAUTION FOR ROAD SIGN ASSIST SYSTEM

(a) The system may not detect traffic signs under the following conditions:

  • The forward recognition camera is misaligned.
  • Dirt, snow, ice or a sticker is on the windshield glass in front of the forward recognition camera.
  • The windshield glass in front of the forward recognition camera is fogged up.
  • The vehicle is significantly tilted.
  • Driving in bad weather (heavy rain or snow, or dense fog), water or snow, etc., is kicked up by the preceding vehicle.
  • The headlights of an oncoming vehicle or sunlight is shining directly on the forward recognition camera.
  • A very bright light from reflective objects, such as a road sign, road surface, another vehicle, etc., is shining directly into the lens of the forward recognition camera.
  • The road sign is dirty, faded, tilted, or has a sticker attached.
  • The sign is dirty, faded or tilted, or the contrast of an electronic sign is poor.
  • Whole or part of the sign is blocked by an object.
  • The vehicle passes the sign too quickly after the sign comes into view.
  • When in low light conditions or when the surrounding brightness changes suddenly.
  • The sign is located immediately after a right or left turn.
  • The sign is posted in a position too far away from the forward recognition camera.
  • The sign is posted in a position that is too low compared to the vehicle.
  • The sign is posted on the opposite side of an intersection or curve.

(b) The system may incorrectly recognize traffic signs under the following conditions:

  • A sign is on an adjacent lane or side road, or immediately after traffic lanes merge or diverge.
  • A sticker or graphic is on the rear of a preceding vehicle.
  • An object which is not a traffic sign is similar in appearance.
  • When there are multiple signs.
  • When a sign for certain kinds of vehicles, such as trucks, is detected.

TROUBLESHOOTING PRECAUTIONS

(a) If the malfunction is due to connectors being loosely connected, or improper installation of parts, reconnecting the connectors or removing and reinstalling the parts may temporarily or completely correct the problem.

(b) In order to determine the malfunctioning area, use DTC output and other data to check vehicle conditions at the time of the malfunction and write down the data before disconnecting connectors or removing/installing parts.

(c) Be sure to check for DTCs related to other systems. The road sign assist system may be influenced by malfunctions in other systems.

HANDLING PRECAUTION

(a) Unless otherwise specified in the procedure, turn the power switch off before removing or installing ECUs and sensors.

(b) After the removal and installation of an ECU or sensor, check that no DTCs are output.

REPLACEMENT PRECAUTIONS

(a) FORWARD RECOGNITION CAMERA:

(1) When the forward recognition camera is replaced with a new one or the windshield glass is replaced or removed/installed, make sure to perform beam axis adjustment for the forward recognition camera and clear the vehicle control history for each system.

HINT:

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

One Time Recognition:

Click here

Sequential Recognition:

Click here

(2) 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 it will not match the information from the vehicle and a DTC may be stored.

(3) Do not dirty or damage the lens when replacing the forward recognition camera.

NOTICE:

If the forward recognition camera lens has been touched, replace it with a new forward recognition camera.

(4) Do not use a forward recognition camera if it has been dropped or subjected to any strong impact.

(b) WINDSHIELD GLASS:

(1) When replacing the windshield glass of a vehicle equipped with a forward recognition camera, make sure to use a Lexus genuine part. If a non-Lexus genuine part is used, the forward recognition camera may not be able to be installed due to a missing bracket or the road sign assist system may not operate properly due to a difference in the transmissivity or black ceramic border.

(2) Do not attach stickers, including transparent stickers, or other items to the outer side of the windshield glass assembly within the area in front of the forward recognition camera.

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