Lexus ES manuals

Lexus ES: Precaution




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

System Name

See Procedure

Lane Control System (for Gasoline Model)

Parking Support Brake System (for Gasoline Model)

Parking Assist Monitor System (for Gasoline Model)

Panoramic View Monitor System (for Gasoline Model)

Pre-collision System (for Gasoline Model)

Power Trunk Lid System (for Gasoline Model)

Lighting System (for Gasoline Model)


(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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(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 parking support brake system, be sure to check for any past and present DTCs in other systems.


(a) Unless specified by the inspection procedure, make sure that the engine switch 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.


(a) Make sure to observe the following points when using the parking support brake system.

(1) Do not rely solely upon the parking support brake system. Relying solely upon the parking support brake 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 parking support brake function can provide support to lessen the severity of collisions. However, it may not operate depending on the situation.
  • The parking support brake system is not a system to stop the vehicle completely. If the vehicle is stopped by the parking support brake system, brake control by the parking support brake system will be canceled after approximately 2 seconds. Depress the brake pedal immediately after the parking support brake system operates.

(2) For the parking support brake 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.


(a) In the following situations, the parking support brake 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.

(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.

(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.

(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.


(a) The rear cross traffic auto brake function does not detect the following objects and vehicles:

  • *: These objects may be detected depending on the situation.

(1) Stationary objects.

(2) Vehicles moving away from this vehicle

(3) Moving objects other than passenger vehicles such as pedestrians, motorcycles or bicycles

(4) Objects extremely close to the blind spot monitor sensors

(5) The speed of a vehicle approaching the right or left at the rear of the vehicle is less than 8 km/h (5 mph).

(6) The speed of a vehicle approaching the right or left at the rear of the vehicle is more than 24 km/h (15 mph).

(7) The distance between the radar sensor and an approaching object is too close.

(b) The rear cross traffic auto brake function may not be able to detect objects in the following situations:

(1) When the vehicle is parked in a very hot or cold environment.

(2) When foreign matter such as snow, ice or mud is attached to the rear bumper.

(3) During heavy rain or when water is splashing on the vehicle.

(4) When an approaching vehicle is blocked from a blind spot monitor sensor by an adjacent vehicle.

(5) When the vehicle is significantly tilted.

(6) When the vehicle is being towed.

(7) When the vehicle is equipped with lowered suspension or tires with a diameter different to that of the original.

(8) When the height of the vehicle has drastically changed (the nose is tilted up or down).

(9) When electronic components such as a backlit license plate, fog lights, a fender pole, wireless antenna or stickers are installed near the sensors.

(10) When a blind spot monitor sensor is misaligned.

(11) When several vehicles are approaching with little space between them.

(12) When a vehicle is approaching at high speed.

(c) The rear cross traffic auto brake function may not detect

(1) When a vehicle is approaching from behind.

(2) When the vehicle is parked at a shallow angle.

(3) When either of the blind spot monitor sensors is blocked such as by an adjacent vehicle.

(4) When the vehicle is parked on a steep hill with varying gradients.

(5) When a vehicle turns in close proximity to the vehicle


(a) Situations in which pedestrians cannot be detected normally

  • Pedestrians who are stooping or squatting.
  • Pedestrians who are laying down.
  • Pedestrians who are running.
  • Pedestrians who suddenly appear from the shadow of the vehicle or a building.
  • Pedestrians who are riding moving objects such as a bicycle, skateboard or Segway.
  • Pedestrians wearing a raincoat, long skirt, etc., making the outline of their body indistinct.
  • Pedestrians at night and pedestrians whose 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.).
  • Damaged or dirty lens (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).

(b) 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 camera is dirty (dirty, snow-melting agents, etc.).
  • Rain drops are moving over the camera lens.
  • There are blinking lights (such as hazard warning lights).


 Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of

 System Description

SYSTEM DESCRIPTION FUNCTION OF COMPONENTS (a) The parking support brake system consists of the following components: Component Function Clearance Warning ECU Assembly Sends the drive for

 System Diagram

SYSTEM DIAGRAM w/ Blind Spot Monitor System w/ Panoramic View Monitor System


 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC AND FREEZE FRAME DATA (USING TECHSTREAM) (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Chassis / Electric Parking Brake / Trouble Codes. Chassis > Ele



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