Lexus ES manuals

Lexus ES: Precaution




When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following systems after the cable is reconnected.

System Name

See Procedure

Lane Control System (for HV Model)

Parking Support Brake System (for HV Model)

Parking Assist Monitor System (for HV Model)

Panoramic View Monitor System (for HV Model)

Pre-collision System (for HV Model)

Power Trunk Lid System (for HV Model)

Lighting System (for HV Model)


(a) Parking Support Alert (static objects)

(1) The parking support alert (static objects) is a support function that notifies the driver of the distance to objects near the vehicle during low-speed driving through a buzzer and display.

(2) Precautions to observe during use

  • The operating range of the sensors and the vehicle speeds at which they operate are limited. When driving the vehicle, be sure to confirm that the area around the vehicle is safe (especially on the sides of the vehicle), use the brakes to control the vehicle speed and drive slowly.
  • Do not install any accessories near the sensors.
  • If a malfunction display is displayed, first confirm the status of the sensor. If a malfunction display is displayed even though there is no ice, snow or dirt, the sensor may be malfunctioning.


  • In very cold weather where a malfunction display appears, the sensor may not be able to detect obstacles.
  • If the malfunction display appears, visually check the sensor first. If the sensor is free of foreign matter but the malfunction display remains, the sensor may be malfunctioning.

(3) Under the following conditions, the detection function may not function properly:

  • A sensor is covered with foreign matter, such as mud or snow (detection function returns to normal when the sensor is cleaned).
  • A sensor is frozen (detection function returns to normal when the temperature of the sensor rises).
  • The area around a sensor has been struck or otherwise subjected to a strong impact.
  • The bumper has been damaged.
  • A hand is blocking a sensor.

(4) Precautions to observe when washing the vehicle

  • When washing the vehicle with a high pressure pressure washer, do not spray the sensor directly. The sensor may stop operating normally if subject to impact from high pressure water.
  • When washing the vehicle with a steam cleaner, do not bring the nozzle of the steam cleaner too close to the sensor area. Steam may cause the sensor to stop operating normally.

(5) Precautions during use

  • Do not allow the speed of the vehicle to exceed the operation vehicle speed.
  • The detection range of the sensor is limited to the vehicle corners and around the front/rear bumpers.
  • The detection range may decrease or the sensor may become unable to detect anything at all, depending on the shape of the obstacle or conditions.
  • The sensor may be unable to detect obstacles that are too close.
  • After an obstacle is detected, it may take a short amount of time for the indicator to operate and the buzzer to sound. The obstacle may approach the non-detection range before the indicator operates and the buzzer sounds, even when driving at low speeds.
  • The sensor may not detect objects that are lower than the sensor, thin stakes and similar objects as they approach, even if they have been detected already.
  • When playing audio or using the air conditioning, sounds such as music or the fan noise may make it difficult to hear the buzzer sound.

(6) The sensor may not be able to detect obstacles in the following situations. Be sure to drive carefully.

  • The sensor is covered by ice, snow or dirt (returns to normal when the sensor is cleaned).
  • The sensor is frozen (returns to normal when not frozen).
  • The sensor is covered by an object such as a hand.
  • In blazing heat or freezing cold.
  • The vehicle is being driven on undulating roads, sloped roads, unpaved roads, in tall grass or similar conditions.
  • The vehicle is close to a source of ultrasonic waves, such as a vehicle horn or sensor system, motorcycle engine, large vehicle air brakes or parking sonar system on another vehicle.
  • Heavy rain or water sprayed on the sensor.
  • The sensor is covered by water on a flooded road.
  • The vehicle is extremely tilted.
  • An after-market fender pole, wireless antenna or fog light is installed.
  • The vehicle is being driven toward a high curb or perpendicular curb.
  • An obstacle is near the bottom of the bumper.
  • An obstacle is too close to the sensor.
  • A towing hook is installed.
  • A suspension other than a genuine suspension is installed.
  • A backlit license plate is installed.

(7) The sensor may not be able to detect the following objects. Be sure to drive carefully.

  • Thin objects such as wire, fences and rope.
  • Objects that absorb sound waves such as strings or snow.
  • Objects with sharp corners.
  • Short or low to the ground objects.
  • Tall objects where the top sticks out.
  • Some people may also not be detected due to their clothing.

(b) Parking Support Alert (rear crossing vehicles)

(1) Safety precautions

  • The driver is responsible for safe operation of the vehicle. The driver must always be aware of the surroundings to ensure safe driving.
  • The RCTA is a supplemental system that notifies the driver of vehicles approaching from the rear left and rear right of the vehicle. The RCTA may not function effectively in certain conditions. The driver must therefore visually confirm safety. Relying solely upon the RCTA may result in unforeseen accidents, serious injury or even death.

(2) Visibility of outer rear view mirror indicator light

  • Strong sunlight may make it difficult to see the outer rear view mirror indicator light.

(3) Hearing RCTA buzzer sound

  • The RCTA buzzer (blind spot monitor buzzer) may be difficult to hear if playing audio at a loud volume or if there are other loud noises.

(4) The following types of vehicles and objects are not detected by the RCTA.

  • Vehicles approaching directly to the rear.
  • Vehicles reversing in a parking space next to the vehicle.
  • Vehicles that the sensor cannot detect due to the presence of an obstacle.
  • Static objects such as guardrails, walls, signs, parked vehicles, etc.*
  • Small two-wheeled vehicles, bicycles, pedestrians, etc.*
  • Vehicles that are moving away from the driver's own vehicle.
  • Vehicles approaching from a parking space next to the vehicle.*


*: The sensor may detect the vehicles and objects described above depending on the situation.

(5) Situations in which the RCTA may not operate effectively

  • The RCTA may not effectively detect vehicles in the following situations.
    • A blind spot monitor sensor position or direction is misaligned because the blind spot monitor sensor or the area around it was subject to a strong impact or the like.
    • Dirt, snow, ice, stickers or other objects are attached to the blind spot monitor sensor or to the rear bumper near the blind spot monitor sensor.
    • The vehicle is being driven through puddles or on wet roads during bad weather, such as heavy rain, snow or fog.
    • When multiple vehicles come close consecutively over a short period of time.
    • There are rapidly approaching vehicles.
    • A towing hook is attached to the rear of the vehicle.
    • The vehicle is being driven in reverse on slopes with extreme changes in gradient.
    • When parking at a small angle.
    • Immediately after the RCTA is turned on.
    • Immediately after the engine running with the RCTA is on.
    • The blind spot monitor sensor cannot detect vehicles due to the presence of an obstacle.
  • There may be unnecessary detections in the following situations.
    • Vehicles pass alongside the vehicle.
    • The vehicle is parked in a parking lot facing a road.
    • There is a metal object that easily reflects radio waves to the rear (such as a guardrail, wall, sign or parked vehicle).
    • A towing hook is attached to the rear of the vehicle.

(6) Handling blind spot monitor sensors

  • A blind spot monitor sensor is installed on both the left and right sides on the rear of the vehicle. Observe the following to ensure that the system operates normally.
    • Always keep the area of the bumper near the blind spot monitor sensors clean.
    • Avoid strong impacts to the bumper around the blind spot sensors. If the position or orientation of the blind spot monitor sensor is even slightly misaligned, it may become unable to correctly detect vehicles, or the equipment may not operate normally.
      1. The blind spot monitor sensor or the area nearby has been subject to a strong impact.
      2. The rear bumper around the blind spot monitor sensor is scratched, dented or partially disconnected.
    • Do not disassemble the blind spot monitor sensor.
    • Do not install accessories, stickers (including transparent stickers, aluminum tape, etc.) to the blind spot monitor sensors.
    • Do not modify the blind spot monitor sensors or the rear bumper near the sensors.
    • Do not paint the rear bumper any color other than an official Lexus color.
    • This product conforms to electrical wave regulations in each country. The stamp on the surface of the product serves as proof of this. Do not remove it.
    • Do not modify this product. Modifying it will invalidate the certification number.

(c) Parking Support Alert (rear pedestrians)

(1) Situations in which pedestrians cannot be detected normally:

  • If a pedestrian is crouching.
  • If a pedestrian is laying down.
  • If a pedestrian is running.
  • If a pedestrian suddenly appears from the shadow of the vehicle or a building.
  • If a pedestrian is are riding moving objects such as a bicycle, skateboard or other light vehicle.
  • If a pedestrian is wearing abnormal clothing (such as a party costume).
  • If a pedestrian is in the dark or is wearling clothing resembles the color of their surroundings.
  • Pedestrians partially obscured by a cart, luggage, etc.
  • At night (after sunset).
  • During bad weather (rain, snow, fog, etc.).
  • If the lens of the sensor is dameged or dirty (dirt, snow-melting agent, etc.).
  • Backlight (direct sunlight, sunlight reflected off the road surface, headlights of other vehicles, etc.).
  • Difference in brightness (near open shutters in a garage or underground parking area).

(2) Objects and situations that may cause incorrect operation

  • Solid objects (pillars, pylons, fences, parked vehicles, etc.).
  • Moving objects (such as passing vehicles, motorcycles, etc.).
  • Moving objects (such as flags, exhaust gas, large drops of rain, large snowflakes, rainwater on roads, etc.).
  • Patterns on roads (white lines, pedestrian crossings, stones, streetcar rails, repaired areas, fallen leaves, gravel, etc.).
  • Grating, ditches and gutters.
  • Sides of roads and steps.
  • Surrounding objects reflected off puddles or wet road surfaces.
  • Shadows.
  • Driving onto an area with a difference in height.
  • The vehicle is extremely tilted (loaded, suddenly braking, etc.).
  • There are changes in gradient.
  • A lowered suspension or tire with a different diameter than a genuine tire, etc. is installed.
  • An extreme change in vehicle height (such as nose up, nose down, etc.).
  • An aftermarket accessory (backlit license plate, fog light, etc.) is installed near the camera.
  • An aftermarket protective part is installed to the rear bumper (bumper trim, etc.).
  • The axis of the camera is misaligned (due to reinstallation, collision, etc.).
  • A towing hook is installed.
  • The rear television camera assembly is dirty (dirty, snow-melting agents, etc.).
  • Rain drops are moving over the camera lens.
  • There are blinking lights (such as hazard warning lights).

(3) The warning of the rear camera detection function may be difficult to notice in the following situations

  • When the multi-display screen is not operating correctly due to extremely high or low temperatures in the cabin.
  • When loud noises make it difficult to hear the RCTA buzzer (blind spot monitor buzzer) such as when the audio system volume is high.


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