Driving -> Trailer towing for Your Toyota Avanza SUV First Generation (2003-2011)

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4-5. Using the driving support systems  
Toyota parking assist-sensor can be operated when  
The engine switch is in the “ON” position and the shift lever is in R.  
Sensor detection information  
Certain vehicle conditions and the surrounding environment may affect the  
ability of a sensor to correctly detect an obstacle. Particular instances where  
this may occur are listed below.  
• There is dirt, snow or ice on a sensor. (Wiping the sensors will resolve  
this problem.)  
• A sensor is frozen. (Thawing the area will resolve this problem.)  
• A sensor is covered in any way.  
• The vehicle is leaning considerably to one side.  
• On an extremely bumpy road, on an incline, on gravel, or on grass.  
• The vicinity of the vehicle is noisy due to vehicle horns, motorcycle  
engines, air brakes of large vehicles, or other loud noises producing ultra-  
sonic waves.  
• There is another vehicle equipped with parking assist sensors in the  
vicinity.  
• A sensor is coated with a sheet of spray or heavy rain.  
• The vehicle is equipped with a fender pole or radio antenna.  
• Towing eyelet is installed.  
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• A bumper or sensor receives a strong impact.  
• The vehicle is approaching a tall or right-angled curb.  
• In harsh sunlight or intense cold weather.  
• A non-genuine Toyota suspension (lowered suspension, etc.) is installed.  
• When attaching a two-way radio antenna.  
• A backlit license plate, license plate holder, etc., are installed.  
In addition to the examples above, there are instances in which, because of  
their shape, signs and other objects may be judged by a sensor to be closer  
than they are.