PRECAUTIONS WHEN REPLACING CLEARANCE WARING ECU ASSEMBLY
When the clearance warning ECU assembly is replaced, update the ECU security key.
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
PRECAUTION FOR SERVICING VEHICLE
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).
PRECAUTION FOR TROUBLESHOOTING
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.
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.
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.
HANDLING PRECAUTIONS FOR ECU OR SENSOR
Unless specified by the inspection procedure, make sure that the ignition switch off when removing or installing each ECU or ultrasonic sensor.
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 PARKING SUPPORT BRAKE SYSTEM
Make sure to observe the following points when using the parking support brake system.
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.
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 TOYOTA 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.
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.
If the area around an ultrasonic sensor is subjected to an impact, equipment may not operate properly due to an ultrasonic sensor malfunction.
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.
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 PARKING SUPPORT BRAKE FUNCTION
In the following situations, the parking support brake system may not operate correctly.
Environmental influence
There is an object that prevents correct detection of an obstruction between the ultrasonic sensor and the obstruction.
An object such as a motorcycle, bicycle or pedestrian crosses in front of the vehicle.
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.
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.
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.
Other
When driving in shift position N
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.