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

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
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.

Pre-Collision System

Symptom

Suspected Area

Link

"Pre-Collision System Unavailable" is displayed

History of millimeter wave radar sensor assembly front beam misalignment (vertical)*

Perform millimeter wave radar sensor assembly adjustment

Millimeter wave radar sensor assembly temperature malfunction

Millimeter wave radar sensor assembly low voltage malfunction

Millimeter wave radar sensor assembly

Combination meter assembly

Driving support ECU assembly

"Pre-Collision System Unavailable Clean Sensor" is displayed

Foreign matter attached to millimeter wave radar sensor assembly

Millimeter wave radar sensor assembly

Combination meter assembly

Driving support ECU assembly

"Front Camera Unavailable" is displayed

Check current condition of forward recognition camera based on related Data List items.

Abnormal forward recognition camera voltage
Forward recognition camera temperature outside of operational range
Other forward recognition camera malfunction

Forward recognition camera

Combination meter assembly

Driving support ECU assembly

"Front Camera Unavailable Remove Debris On Windshield" is displayed

Front of forward recognition camera or windshield glass is dirty or misty

Forward recognition camera

Combination meter assembly

Driving support ECU assembly

Although there is possibility of collision, pre-collision controls (all controls) do not operate ("Pre-collision System Unavailable" is not displayed)

Check if pre-collision system is canceled

Vehicle condition/environment does not match the pre-collision system operation conditions.

Check installation condition of millimeter wave radar sensor assembly

Perform millimeter wave radar sensor assembly adjustment

Millimeter wave radar sensor assembly

Check installation condition of forward recognition camera

Perform forward recognition camera adjustment

Forward recognition camera

Driving support ECU assembly

Although there is no possibility of collision, pre-collision controls (all controls) operate

Vehicle condition/environment does not match the pre-collision system operation conditions.

Check installation condition of millimeter wave radar sensor assembly

Perform millimeter wave radar sensor assembly adjustment

Millimeter wave radar sensor assembly

Check installation condition of forward recognition camera

Perform forward recognition camera adjustment

Forward recognition camera

Driving support ECU assembly

Pre-collision system does not operate

Check if pre-collision system is canceled

Driving support ECU assembly

Pre-collision system cannot be canceled (PCS warning light does not illuminate)

Combination meter assembly (check if indicator illuminates using Active Test)

Driving support ECU assembly

Combination meter assembly

*: If "Pre-Collision System Unavailable." is displayed on the multi-information display and there is front beam axis misalignment (vertical) history, the millimeter wave radar sensor assembly may be performing beam axis alignment correction. In this case, the message will disappear when the millimeter wave radar sensor assembly front beam axis adjustment has completed.
"Pre-Collision System Unavailable." disappears when the millimeter wave radar sensor assembly beam axis alignment correction has completed.

Make sure to delete the beam axis misalignment history when the millimeter wave radar sensor assembly beam axis alignment correction has completed.

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