Toyota Yaris: Pre-collision System / Precaution

NOTICE:

• When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems must be initialized after the cable is reconnected.

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• If the auxiliary battery has been discharged and charged or the cable has been disconnected and reconnected to the negative (-) auxiliary battery terminal, perform Steering Sensor Zero Point Calibration.

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• If an auxiliary battery terminal has been disconnected and reconnected and then the vehicle has not been driven for a certain amount of time.
• If the shift lever is in R.
• When the VSC OFF indicator is illuminated (only the pre-collision warning function will be operational).

• Pre-collision warning

  Detectable objects	Vehicle speed	Relative speed between your vehicle and object
  Vehicles	Approximately 10 to 180 km/h (7 to 110 mph)	Approximately 10 to 180 km/h (7 to 110 mph)

• Pre-collision brake assist

  Detectable objects	Vehicle speed	Relative speed between your vehicle and object
  Vehicles	Approximately 30 to 180 km/h (20 to 110 mph)	Approximately 30 to 180 km/h (20 to 110 mph)

• Pre-collision braking

  Detectable objects	Vehicle speed	Relative speed between your vehicle and object
  Vehicles	Approximately 10 to 180 km/h (7 to 110 mph)	Approximately 10 to 180 km/h (7 to 110 mph)

  If either of the following occur while the pre-collision braking function is operating, it will be canceled:

  • The accelerator pedal is depressed strongly.
  • The steering wheel is turned sharply or abruptly.

• When passing a vehicle or other object.
• When changing lanes while overtaking a preceding vehicle.
• When approaching a vehicle in an adjacent lane or on the roadside, such as when changing the course of travel.
• When rapidly closing on a vehicle ahead.
• When approaching a vehicle or object on the roadside, such as a guardrails, utility poles, trees, or walls.
• When there is a vehicle or object by the roadside at the entrance of a curve.
• When there are patterns or paint in front of your vehicle that may be mistaken for a vehicle.
• When the front of your vehicle is hit by water, snow, dust, etc.
• When overtaking a preceding vehicle that is changing lanes or making a right/left turn.
• When passing an oncoming vehicle that is stopped to make a right/left turn.
• When a vehicle ahead approaches very close and then stops before entering the path of your vehicle.
• If the front of your vehicle is raised or lowered, such as when on an uneven or undulating road surface.
• When driving on a road surrounded by a structure, such as in a tunnel or on an iron bridge.
• When there is a metal object (manhole cover, steel plate, etc.), steps, or a protrusion in front of your vehicle.
• When passing under an object (road sign, billboard, etc.).
• When approaching an electric toll gate barrier, parking area barrier, or other barrier that opens and closes.
• When using an automatic car wash.
• When driving through or under objects that may contact your vehicle, such as thick grass, tree branches, or a banner.
• When driving through steam or smoke.
• When driving near an object that reflects radio waves, such as a large truck or guardrail.
• When driving near a TV tower, broadcasting station, electric power plant, radar equipped vehicles, etc., or other location where strong radio waves or electrical noise may be present.
• When there are many things which can reflect the radio waves of the radar in the vicinity (tunnels, truss bridges, gravel roads, snow covered road that have tracks, etc.)

• When an oncoming vehicle is approaching your vehicle.
• When your vehicle or a vehicle ahead is wobbling.
• If a vehicle ahead makes an abrupt maneuver (such as sudden swerving, acceleration or deceleration).
• When your vehicle approaches a vehicle ahead rapidly.
• When a vehicle ahead is not directly in front of your vehicle.
• When a vehicle ahead is near a wall, fence, guardrail, manhole cover, steel plate on the road, another vehicle, etc.
• When a vehicle ahead is under a structure.
• When part of a vehicle ahead is hidden by an object.
• When there are many things which can reflect the radio waves of the radar in the vicinity (tunnels, truss bridges, gravel roads, snow covered road that have tracks, etc.)
• When there is an effect on the radio waves to the radar that is installed on another vehicle
• When multiple vehicles ahead are close together.
• If the sun or other light is shining directly on a vehicle ahead.
• When a vehicle ahead is a shade of white and looks extremely bright.
• When a vehicle ahead appears to be nearly the same color or brightness as its surroundings.
• If a vehicle cuts or suddenly emerges in front of your vehicle.
• When the front of your vehicle is hit by water, snow, dust, etc.
• When a very bright light ahead, such as the sun or the headlights of oncoming traffic, shines directly into the forward recognition camera.
• When approaching the side or front of a vehicle ahead.
• If a vehicle ahead is a motorcycle or bicycle.
• If a vehicle ahead is narrow, such as a personal mobility vehicle.
• If a preceding vehicle has a small rear end, such as an unloaded truck.
• If a preceding vehicle has a low rear end, such as a low bed trailer.
• If a vehicle ahead has extremely high ground clearance.
• If a vehicle ahead is carrying a load which protrudes past its rear bumper.
• If a vehicle ahead is irregularly shaped, such as a tractor or side car.
• When driving in inclement weather such as heavy rain, fog, snow or a sandstorm.
• When driving through steam or smoke.
• When the surrounding area is dim, such as at dawn or dusk, or while at night or in a tunnel, making a vehicle ahead appear to be nearly the same color as its surroundings.
• When driving in a place where the surrounding brightness changes suddenly, such as at the entrance or exit of a tunnel.
• After the engine has started the vehicle has not been driven for a certain amount of time.
• While making a left/right turn and for a few seconds after making a left/right turn.
• While driving on a curve and for a few seconds after driving on a curve.
• If your vehicle is skidding.
• If the front of the vehicle is raised or lowered.
• If the wheels are misaligned.
• If a wiper blade is blocking the forward recognition camera.
• The vehicle is being driven at extremely high speeds.
• When driving on a hill.
• If the millimeter wave radar sensor assembly or forward recognition camera is misaligned.

• If the braking functions cannot operate to their full extent, such as when the brake parts are extremely cold, extremely hot, or wet.
• If the vehicle is not properly maintained (brakes or tires are excessively worn, improper tire inflation pressure, etc.).
• When the vehicle is being driven on a gravel road or other slippery surface.
• When the road surface has deep wheel tracks.
• When driving on a hill road.
• When driving on a road that has inclines to the left or right.

• If VSC is disabled, the pre-collision brake assist and pre-collision braking functions are also disabled.
• The PCS warning light will turn on and "VSC Turned Off Pre-Collision Brake System Unavailable" will be displayed on the multi-information display.

• When the vehicle is being towed
• When the vehicle is towing another vehicle
• When transporting the vehicle via truck, boat, train or similar means of transportation
• When the vehicle is raised on a lift with the engine running and the tires are allowed to rotate freely
• When inspecting the vehicle using a drum tester such as a chassis dynamometer or speedometer tester, or when using an on vehicle wheel balancer
• When a strong impact is applied to the front bumper or front grille, due to an accident or other reasons
• If the vehicle cannot be driven in a stable manner, such as when the vehicle has been in an accident or is malfunctioning
• When the vehicle is driven in a sporty manner or off-road
• When the tires are not properly inflated
• When the tires are very worn
• When tires of a size other than specified are installed
• When tire chains are installed
• When a compact spare tire or an emergency tire puncture repair kit is used
• If equipment (snow plow, etc.) that may obstruct the millimeter wave radar sensor assembly or forward recognition camera is temporarily installed to the vehicle

• Make sure that the ignition switch is off unless otherwise specified in the procedure.
• After removal/installation, check for DTCs and confirm that a normal system code is output.

Pre-collision System

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Parts Location

PARTS LOCATION ILLUSTRATION *1 FORWARD RECOGNITION CAMERA *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *3 BRAKE ACTUATOR ASSEMBLY - SKID CONTROL ECU *4 ECM ILLUSTRATION *1 COMBINATION METER ASSEMBLY - MULTI-INFORMATION DISPLAY - PCS WARNING LIGHT *2 STEERING SENSOR *3 POWER DISTRIBUTION BOX ASSEMBLY - ECU-IGR NO...

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