Toyota Yaris: Active Safety System / Low Speed Pre-Collision System

The Low Speed Pre-Collision System is designed to reduce damage in the event of a collision by operating the brake control (Low Speed Pre-Collision System brake) when the system’s laser sensor detects a vehicle ahead and determines that a collision with a vehicle ahead is unavoidable. It may also be possible to avoid a collision if the relative speed between your vehicle and a vehicle ahead is less than about 12 mph (20 km/h).

In addition, when the driver depresses the brake pedal while the system is in the operation range at about 2 to 18 mph (4 to 30 km/h), the brakes are applied firmly and quickly to assist. (Brake Assist (Low Speed Pre-Collision System brake assist))

• The Low Speed Pre-Collision System will not operate if the driver is deliberately performing driving operations (accelerator pedal and steering wheel).
• The Low Speed Pre-Collision System will operate under the following conditions.
  • The engine is running.
  • The Low Speed Pre-Collision System warning light (amber) does not illuminate.
  • The vehicle speed is between about 2 to 18 mph (4 to 30 km/h).
  • The Low Speed Pre-Collision System is not turned off.
  • The DSC is not malfunctioning.
• The Low Speed Pre-Collision System detects a vehicle ahead by emitting a near-infrared laser beam and receiving the beam reflected off the reflector of the vehicle ahead, and then using it for the measurement. Consequently, the Low Speed Pre-Collision System may not operate under the following conditions:
  • Reflection of the laser is poor due to the shape of the vehicle ahead.
  • The vehicle ahead is significantly dirty.
  • Under bad weather condition, such as rain, fog and snow.
  • The window washer is being used or the windshield wipers are not used when it’s raining.
  • The windshield is dirty.
  • The steering wheel is turned completely left or right, or the vehicle is accelerated rapidly and comes close to the vehicle ahead.
  • Trucks with low loading platforms and vehicles with an extremely low or high profile.
  • Vehicles with certain shapes such as a vehicle carrier.
• Under the following conditions, the Low Speed Pre-Collision System may not operate normally.
  • Heavy luggage is loaded in the luggage compartment or on the rear seat.
  • If there is the possibility of partial contact with a vehicle ahead.
  • When driving on continuously curving roads, and entering and exiting exits.
  • Elongated luggage or cargo is loaded onto installed roof rails and covers the laser sensor.
  • Exhaust gas from the vehicle in front, sand, snow, and water vapor rising from manholes and grating, and water splashed into the air.
  • When towing a malfunctioning vehicle.
  • When driving with tires having significantly different wear.
• In the following cases, the laser sensor may inadvertently determine that there is a vehicle ahead and the Low Speed Pre-Collision System may operate.
  • Objects on the road at the entrance to a curve.
  • Vehicles passing in the opposite lane while making a curve.
  • Metal objects, bumps, or protruding objects on the road.
  • When passing through a toll gate equipped with a bar.
  • When passing under a vinyl curtain or flag.
  • Plastic objects such as pylons.
  • Two-wheeled vehicles, pedestrians, animals or standing trees.
• Manual transaxle:

  If the vehicle is stopped by the Low Speed Pre-Collision System operation and the clutch pedal is not depressed, the engine stops.

• The Low Speed Pre-Collision System warning light (amber) turns on when the system has a malfunction.

  Refer to Warning Lights.

WARNING

Do not rely on the Low Speed Pre-Collision System as a substitute for safer driving

The Low Speed Pre-Collision System cannot compensate for unsafe and reckless driving, excessive speed, tailgating (following another vehicle too closely), and driving on slippery roads such as wet, snowy, and icy roads (reduced tire friction and road contact because of water on the road surface). You can still have an accident.

Do not rely completely on the Low Speed Pre-Collision System

• The Low Speed Pre-Collision System is only designed to reduce damage in the event of a collision. Over reliance on the system leading to the accelerator pedal or brake pedal being mistakenly operated could result in an accident.
• The Low Speed Pre-Collision System is a system which operates in response to a vehicle ahead. The system may not be able to detect or react to two-wheeled vehicles or pedestrians.
• The laser sensor for the Low Speed Pre-Collision System is installed near the rearview mirror. To assure the correct operation of the Low Speed PreCollision System, heed the following cautions.
  • Do not apply stickers to the surface of the windshield near the laser sensor (including transparent stickers). Otherwise, the laser sensor may not be able to detect vehicles ahead which could result in an accident.
  • Do not apply coating agent to the windshield. Otherwise, the laser sensor may not be able to detect vehicles or obstructions in front which could result in an accident.
  • Do not disassemble the laser sensor.
  • If cracks or damage caused by flying gravel or debris is visible near the laser sensor, stop using the Low Speed Pre-Collision System immediately and have your vehicle inspected by your Toyota dealer. If the vehicle continues to be driven with cracks or scratch marks left on the windshield near the laser sensor, the system may operate unnecessarily and cause an unexpected accident.

    Refer to Stopping The Low Speed Pre-Collision System Operation.

  • When replacing the windshield wipers or windshield, consult your Toyota dealer.
• The laser sensor includes a function for detecting a soiled windshield and informing the driver, however, depending on the conditions, it may not detect plastic shopping bags, ice or snow on the windshield. In such cases, the system cannot accurately determine a vehicle ahead and may not be able to operate normally. Always drive carefully and pay attention to the road ahead.

WARNING

Do not modify the suspension

If the vehicle height or inclination is changed, the system will not be able to correctly detect vehicles ahead. This will result in the Low Speed Pre-Collision System not operating normally or mistakenly operating, which could cause a serious accident.

Turn off the Low Speed Pre-Collision System when the vehicle is running on a chassis roller or being towed

Turn off the Low Speed Pre-Collision System to prevent mistaken operation when the vehicle is running on a chassis roller or being towed. Refer to Stopping The Low Speed Pre-Collision System Operation

NOTICE

When driving off-road in areas where there is grass or forage, it is recommended that the Low Speed Pre-Collision System be turned off.

Always use tires for all wheels that are of the specified size, and the same manufacturer, brand, and tread pattern. In addition, do not use tires with significantly different wear patterns on the same vehicle as the Low Speed Pre-Collision System may not operate normally.

• Low Speed Pre-Collision System Indicator Light (Red)
• Stopping the Low Speed Pre-Collision System Operation