PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): PRECAUTION; 2019 - 2021 MY Avalon HV [04/2018

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001BE4W
Model Year Start: 2019	Model: Avalon HV	Prod Date Range: [04/2018 - 08/2021]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM (for HV Model): PRECAUTION; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]

PRECAUTION

HANDLING PRECAUTION FOR PRE-COLLISION SYSTEM

(a) In some situations such as the following, the system may determine that there is a possibility of a frontal collision and operate.

When passing a vehicle or pedestrian
When changing lanes while overtaking a preceding vehicle
When overtaking a preceding vehicle that is changing lanes
When overtaking a preceding vehicle that is making a left/right turn
When passing a vehicle in an oncoming lane that is stopped to make a right/left turn
When driving on a road where relative location to vehicle ahead in an adjacent lane may change, such as on a winding road
When rapidly closing on a vehicle ahead
If the front of the vehicle is raised or lowered, such as when the road surface is uneven or undulating
When approaching objects on the roadside, such as guardrails, utility poles, trees, or walls
When there is a vehicle, pedestrian, or object by the roadside at the entrance of a curve
When driving on a narrow path 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 on the road surface or roadside
When a crossing pedestrian approaches very close to the vehicle
When passing through a place with a low structure above the road (low ceiling, traffic sign, etc.)
When passing under an object (billboard, etc.) at the top of an uphill road
When rapidly closing on 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 the vehicle, such as thick grass, tree branches, or a banner
When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
When driving through steam or smoke
When there are patterns or paint on the road or a wall that may be mistaken for a vehicle or pedestrian
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, or other location where strong radio waves or electrical noise may be present

(b) In some situations such as the following, a vehicle may not be detected by the millimeter wave radar sensor assembly and forward recognition camera, preventing the system from operating properly.

If an oncoming vehicle is approaching your vehicle
If a vehicle ahead is a motorcycle or bicycle
When approaching the side or front of a 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 is carrying a load which protrudes past its rear bumper
If a vehicle ahead has extremely high ground clearance
If a vehicle ahead is irregularly shaped, such as a tractor or side car
If the sun or other light is shining directly on a vehicle ahead
If a vehicle cuts in front of your vehicle or emerges from beside a vehicle
If a vehicle ahead makes an abrupt maneuver (such as sudden swerving, acceleration or deceleration)
When suddenly cutting behind a preceding vehicle
When a vehicle ahead is not directly in front of your vehicle
When driving in inclement weather such as heavy rain, fog, snow or a sandstorm
When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
When driving through steam or smoke
When driving in a place where the surrounding brightness changes suddenly, such as at the entrance or exit of a tunnel
When a very bright light, such as the sun or the headlights of oncoming traffic, shines directly into the forward recognition camera
When the surrounding area is dim, such as at dawn or dusk, or while at night or in a tunnel
After the hybrid system 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 wobbling
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

(c) In some situations such as the following, sufficient braking force may not be obtained, preventing the system from performing properly.

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

(d) Some pedestrians such as the following may not be detected by the millimeter wave radar sensor assembly and forward recognition camera, preventing the system from operating properly.

Pedestrians shorter than approximately 1 m (3.2 ft.) or taller than approximately 2 m (6.5 ft.)
Pedestrians wearing oversized clothing (a rain coat, long skirt, etc.), making their silhouette obscure
Pedestrians who are carrying large baggage, holding an umbrella, etc., hiding part of their body
Pedestrians who are bending forward or squatting
Pedestrians who are pushing a stroller, wheelchair, bicycle or other vehicle
Groups of pedestrians which are close together
Pedestrians who are wearing white and look extremely bright
Pedestrians in the dark, such as at night or while in a tunnel
Pedestrians whose clothing appears to be nearly the same color or brightness as their surroundings
Pedestrians near walls, fences, guardrails, or large objects
Pedestrians who are on a metal object (manhole cover, steel plate, etc.) on the road
Pedestrians who are walking fast
Pedestrians who are changing speed abruptly
Pedestrians running out from behind a vehicle or a large object
Pedestrians who are extremely close to the side of the vehicle (outside rear view mirror, etc.)

(e) When the PCS warning light illuminates and a warning message is displayed on the multi-information display, the system may not temporarily operate, or it may have a malfunction.

HINT:

For details on the operation of the PCS warning light and displayed warning messages, refer to Diagnosis System.

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(1) In the following situations, the warning light will turn off, the message will disappear and the system will become operational when normal operating conditions return.

When the millimeter wave radar sensor assembly or forward recognition camera or the area around either sensor is hot, such as in the sun
When the millimeter wave radar sensor assembly or forward recognition camera or the area around either sensor is cold, such as in an extremely cold environment
When a millimeter wave radar sensor assembly or forward recognition camera is dirty or covered with snow, etc.
When the part of the windshield glass in front of the forward recognition camera is fogged up or covered with condensation or ice
If the forward recognition camera is obstructed, such as when the hood is open or a sticker is attached to the windshield glass near the forward recognition camera
When automatic calibration is being performed after millimeter wave axis misalignment is detected

(f) If VSC is disabled, the pre-collision brake assist and pre-collision braking functions are also disabled.

HINT:

The PCS warning light will turn on and "VSC Turned Off Pre-collision Brake System Unavailable" will be displayed on the multi-information display.

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

NOTICE:

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

System Name	See Procedure
Lane Departure Alert System (w/ Steering Control)
Pre-collision System
Intelligent Clearance Sonar System
Lighting System (w/ Cornering Light)
Parking Assist Monitor System
Panoramic View Monitor System

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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PRECAUTION BEFORE SERVICING

(a) Make sure to turn the pre-collision system off in the following situations, as it may operate unexpectedly or may not operate when necessary.

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 hybrid system operating 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

TROUBLESHOOTING PRECAUTIONS

(a) If a terminal contact malfunction or part installation problem occurs, removal and reinstallation of the suspected part may return the system to normal. However, be aware that the normal condition may only be temporary.

(b) Before disconnecting connectors or removing/installing parts, determine the malfunctioning area by checking and writing down the vehicle conditions (output DTCs, etc.) at the time the malfunction occurred.

(c) Be sure to check for DTCs related to other systems. The pre-collision system may be influenced by malfunctions in other systems.

(d) The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

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HANDLING PRECAUTIONS

(a) When removing and installing ECUs, sensors, switches or other pre-collision system related parts, perform the following:

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

REPLACEMENT PRECAUTIONS

(a) DRIVING SUPPORT ECU ASSEMBLY:

(1) When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

(b) MILLIMETER WAVE RADAR SENSOR ASSEMBLY:

(1) When replacing the millimeter wave radar sensor assembly, always replace it with a new one. When a new millimeter wave radar sensor assembly is installed to the vehicle, it receives vehicle information from the driving support ECU assembly and stores it. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly and millimeter wave radar sensor assembly will not match and a DTC may be stored.

(2) If the millimeter wave radar sensor assembly has been replaced with a new one, be sure to perform Front Beam Axis Adjustment.

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(1) If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform forward recognition camera adjustment. If the system is turned on without performing forward recognition camera adjustment, DTC C1AA9 will be stored.

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(d) WINDSHIELD GLASS:

(1) When replacing the windshield glass of a vehicle equipped with a forward recognition camera, make sure to use a Toyota genuine part. If a non-Toyota genuine part is used, the forward recognition camera may not be able to be installed due to a missing bracket or the pre-collision system may not operate properly due to a difference in the transmissivity or black ceramic border.

(2) Do not attach stickers, including transparent stickers, or other items to the outer side of the windshield glass assembly within the area in front of the forward recognition camera.