Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Precaution



(a) The descriptions for the blind spot monitor sensors differ depending on the system. The expressions listed in the table below are used in this Repair Manual.

Part Name

Actual Part Name

Blind spot monitor sensor LH (B)

Blind spot monitor sensor LH

Blind spot monitor sensor RH (A)

Blind spot monitor sensor RH



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


(a) Precautions to observe during use

(1) There are some restrictions to the detection range and operation speed of the sensor. When driving the vehicle in forward or reverse, 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.

(2) Do not install any accessories within the detection range of the sensor.

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

(1) A sensor is covered with foreign matter, such as mud or snow (detection function returns to normal when the sensor is cleaned).

(2) A sensor is frozen (detection function returns to normal when the temperature of the sensor rises).

(3) The area around the sensor is struck by an object, hit or otherwise subject to a strong impact.

(4) While no obstacles were detected, the detection display illuminated or blinked.

(5) The bumper is struck.

(6) When the detection display remains illuminated or blinking even though the buzzer did not sound.

(7) A hand is blocking a sensor.


  • In very cold weather where a malfunction display appears, the sensor may not be able to detect obstacles.
  • The sensor malfunction can be determined from the malfunction displays on the combination meter assembly or by checking the DTCs
  • 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.

(c) Precautions to observe when washing the vehicle

(1) When washing the vehicle in a high pressure car washer, do not allow water to make direct contact with the sensor area. The sensor may stop operating normally if subject to impact from high pressure water.

(2) When washing the vehicle in a washer that uses steam, do not allow the steam to come too close to the sensor area. Steam may cause the sensor to stop operating normally.

(d) Precautions during use

(1) Do not allow the speed of the vehicle to exceed the operation vehicle speed.

(2) The detection range of the sensor is limited to the vehicle corners and around the front/rear bumpers.

(3) 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.

(4) The sensors may not be able to detect obstacles that are too close to the sensors.

(5) 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.

(6) 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.

(7) 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.

(e) The detection range may be affected by the following conditions:

(1) A sensor is covered with foreign matter, such as mud or snow.

(2) The vehicle is in an excessively hot or excessively cold area.

(f) Under the following conditions, a detection error may occur:

(1) The sensor is covered by ice, snow or dirt (returns to normal when the sensor is cleaned).

(2) The sensor is frozen (returns to normal when not frozen).

(3) The sensor is covered by an object such as a hand.

(4) Driving on a bumpy road, an unpaved road or in tall grass.

(5) 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.

(6) It is raining heavily or the sensor is sprayed with water.

(7) The sensor is covered by water on a flooded road.

(8) The vehicle is tilted at a steep angle.

(9) The vehicle is equipped with a fender pole or a wireless antenna mechanism.

(10) A sensor is covered with foreign matter, such as mud or snow.

(11) The vehicle is moving forward or backward towards high curbs or objects that are perpendicular to the ground.

(12) A sensor is sprayed with high pressure water or steam.

(13) A towing hitch is mounted on the vehicle.

(14) A suspension other than a genuine suspension is installed.

(15) A backlit license plate is installed.

(g) The sensors cannot detect the following objects:

(1) Thin objects, such as wires and ropes.

(2) Materials that absorb ultrasonic waves, such as cotton or snow.

(3) Objects with sharp edges.

(4) Short objects.

(5) Objects that are tall and protrude toward the vehicle above the detection range of the sensors.

(6) Some people may also not be detected due to their clothing.

(h) Other notices:

(1) The sensors cannot detect objects directly under the bumper. (A sensor may detect low objects and thin poles, and then lose track of them.)

(2) Be aware that the detection range of this system is limited. In certain conditions, some objects may not be detected. Always make sure to check all around the vehicle when driving or parking.

(3) The sensors may not be able to detect obstacles if the sensors have been dropped or subjected to a strong impact.



When the clearance warning ECU assembly is replaced, update the ECU security key.

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