Lexus NX manuals

Lexus NX: Precaution

Lexus NX Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intelligent Clearance Sonar System / Precaution

PRECAUTION

PRECAUTION FOR SERVICING VEHICLE

(a) After ECUs or parts are removed and installed, or replaced during inspection or servicing the vehicle, it is necessary to perform certain procedures (adjustment, calibration, initialization or registration).

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PRECAUTION FOR TROUBLESHOOTING

(a) When a terminal contact is loose or damaged or a part is improperly installed, the system may only temporarily return to normal if the part is removed and installed without thorough diagnosis and repair.

(b) In order to assist with diagnosis, check and make a note of related information such as DTCs and Freeze Frame Data before disconnecting any connectors or removing and installing parts.

(c) Since the system may be influenced by malfunctions in systems other than the intelligent clearance sonar system, be sure to check for any past and present DTCs in other systems.

HANDLING PRECAUTIONS FOR ECU OR SENSOR

(a) Unless specified by the inspection procedure, make sure that the power switch is off when removing or installing each ECU or ultrasonic sensor.

(b) After removing and installing each ECU or ultrasonic sensor and all parts have been installed, check and ensure that no DTCs are output.

HANDLING PRECAUTIONS FOR INTELLIGENT CLEARANCE SONAR SYSTEM

(a) Make sure to observe the following points when using the intelligent clearance sonar system.

(1) Do not rely solely upon the intelligent clearance sonar system. Relying solely upon the intelligent clearance sonar system may lead to an unexpected accident.

  • Driving safely is the sole responsibility of the driver. Pay careful attention to the surrounding conditions in order to ensure safe driving. The intelligent clearance sonar function can provide support to lessen the severity of collisions. However, it may not operate depending on the situation.
  • The intelligent clearance sonar system is not a system to stop the vehicle completely. If the vehicle is stopped by the intelligent clearance sonar system, brake control by the intelligent clearance sonar system will be canceled after approximately 2 seconds. Depress the brake pedal immediately after the intelligent clearance sonar system operates.

(2) For the intelligent clearance sonar system to operate correctly, make sure to observe the following points for the ultrasonic sensors. If not, the ultrasonic sensors may not operate correctly, resulting a serious injury.

  • Do not modify, disassemble or paint an ultrasonic sensor.
  • When replacing an ultrasonic sensor, only use LEXUS genuine parts.
  • Do not subject an ultrasonic sensor or the area around an ultrasonic sensor to any impact.
  • Do not damage an ultrasonic sensor. Always keep the ultrasonic sensors clean.

(3) Do not modify the suspension, as changes to the height or incline of the vehicle may prevent the ultrasonic sensors from correctly detecting obstacles. This may cause the system to fail to operate or to operate incorrectly.

(4) If the area around an ultrasonic sensor is subjected to an impact, equipment may not operate properly due to an ultrasonic sensor malfunction.

(5) When washing the vehicle with a high-pressure washer, do not spray water on the ultrasonic sensors or surrounding areas. High-pressure water can damage the ultrasonic sensors.

(6) When using steam to wash the vehicle, do not apply steam too close to the ultrasonic sensors. They may not function properly if subjected to steam.

PRECAUTIONS FOR INTELLIGENT CLEARANCE SONAR FUNCTION

(a) In the following situations, the intelligent clearance sonar system may not operate correctly.

(1) Environmental influence

  • There is an object that prevents correct detection of an obstruction between the ultrasonic sensor and the obstruction.
  • An object such as motorcycle, bicycle or pedestrian crosses in front of the vehicle.
  • The vehicle is moved forward or backward towards high curbs or objects that are perpendicular to the ground.
  • Driving on a bumpy road, unpaved road, slope, or grass.

(2) Influence from the weather

  • When the vehicle is operated under the hot sun or in a freezing climate.
  • When foreign matter such as ice, snow or mud is attached to an ultrasonic sensor. If the ultrasonic sensor is cleaned, the system will return to normal.
  • It is raining heavily or the sensor is sprayed with water.
  • The wind is strong.
  • In severe weather such as fog, snow or a sandstorm.
  • The ultrasonic sensor is frozen (will return to normal after defrosting).

(3) Influence from other ultrasonic waves

  • When ultrasonic waves are received from the horn or parking sonar system of another vehicle, a motorcycle engine, or the air brakes of a large vehicle.
  • Electronic components such as a backlit license plate (especially fluorescent types), fog lights, a fender pole or a wireless antenna are installed near an ultrasonic sensor.

(4) Changes in the vehicle

  • The vehicle is tilted at a steep angle.
  • The height of the vehicle has drastically changed due to loading (the nose tilts up or down).
  • When the ultrasonic sensors become misaligned due to removal and installation or a collision, etc.
  • When the tire diameter is not correct for the vehicle, the suspension has been modified, etc.
  • A tow hook is installed.

(b) The sensors cannot detect the following objects:

  • Objects that absorb ultrasonic waves such as people (especially people wearing certain types of clothing), cotton or snow.
  • Objects that are not perpendicular to the path of the vehicle, or are angled away from the ultrasonic sensors, or objects with uneven surfaces.
  • Short objects
  • Thin objects such as wire, rope or a post.
  • Objects that are extremely close to a bumper.
  • Objects that are tall and protrude toward the vehicle above the detection range of the sensors.
  • Acute-angled object.

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 Parts Location

PARTS LOCATION ILLUSTRATION *A w/ Panoramic View Monitor System - - *1 FRONT CORNER ULTRASONIC SENSOR (FR SENSOR) *2 FRONT CENTER ULTRASONIC SENSOR (FRC SENSOR) *3 FRONT CENT

 System Diagram

SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line Clearance Warning ECU Assembly Combination Meter Assembly Sonar information signal Control status signal CAN

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the intelligent clearance sonar system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP

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DESCRIPTION When an electronically controlled brake system malfunction signal sent from the brake booster with master cylinder assembly (skid control ECU) is detected by the clearance warning ECU assembly, DTC C1A50 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area

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DESCRIPTION These DTCs are stored when a malfunction occurs in the CAN communication circuit. DTC No. Detection Item DTC Detection Condition Trouble Area U0073 Sending Malfunction (Navigation to APGS) CAN bus connection error CAN communication system U0100 Engine ECU Communi

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