Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the ECM, refer to Registration.

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  • 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 the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

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  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

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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.
Dynamic Radar Cruise Control System

Symptom

Suspected Area

Link

The dynamic radar cruise control system cannot be turned on using the cruise control main switch

CAN communication system

Steering pad switch circuit

Cruise main indicator light circuit

Combination meter assembly

Driving support ECU assembly

ECM

The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode

CAN communication system

Steering pad switch circuit

Combination meter assembly

ECM

The vehicle-to-vehicle distance cannot be changed

CAN communication system

Distance control switch circuit

Combination meter assembly

Driving support ECU assembly

Vehicle speed setting cannot be performed (in constant speed control mode)

Fail-safe chart

CAN communication system

Steering pad switch circuit

Stop light switch circuit

Automatic transaxle system

Electronically controlled brake system

Driving support ECU assembly

ECM

Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode)

Millimeter wave radar sensor assembly front radar incorrect axis gap (vertical) history*1

Fail-safe chart

Forward recognition camera is temporarily unavailable

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Steering pad switch circuit

Automatic transaxle system

Millimeter wave radar sensor assembly

Forward recognition camera

Electronically controlled brake system

Combination meter assembly

Driving support ECU assembly

ECM

Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode)

Fail-safe chart

CAN communication system

Steering pad switch circuit

Stop light switch circuit

Automatic transaxle system

Electronically controlled brake system

Driving support ECU assembly

ECM

Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode)

Fail-safe chart

Forward recognition camera is temporarily unavailable

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Steering pad switch circuit

Automatic transaxle system

Millimeter wave radar sensor assembly

Forward recognition camera

Electronically controlled brake system

Combination meter assembly

Driving support ECU assembly

ECM

Hunting/vehicle speed is not constant (in constant speed control mode)

CAN communication system

Electronically controlled brake system

ECM

Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode)

Millimeter wave radar sensor assembly is dirty

Millimeter wave radar sensor assembly beam axis not adjusted

CAN communication system

Electronically controlled brake system

Driving support ECU assembly

ECM

Vehicle speed control by the dynamic radar cruise control system is not canceled when the CANCEL switch is pushed

Steering pad switch circuit

ECM

Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system

Park/neutral position switch assembly

Shift lock control unit assembly

Automatic transaxle system

ECM

Vehicle speed control by the dynamic radar cruise control system is not canceled when a shift paddle switch is operated*2

Automatic transaxle system

Shift paddle switch circuit

ECM

Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system

Stop light switch circuit

ECM

Control cannot be canceled while the vehicle is stopped

CAN communication system

Electronically controlled brake system

Electric parking brake system

Front door courtesy switch circuit

Seat belt warning system

ECM

Control cannot be canceled by operating the parking brake

CAN communication system

Electronically controlled brake system

Electric parking brake system

Brake actuator assembly

Driving support ECU assembly

ECM

Even though the millimeter wave radar sensor assembly is not dirty, the warning message "Clean Sensor" is displayed

Millimeter wave radar sensor assembly

The vehicle approach warning buzzer does not sound

Combination meter assembly

Check millimeter wave radar sensor assembly installation position

Check installation of forward recognition camera

Forward recognition camera

Millimeter wave radar sensor assembly

Driving support ECU assembly

Even though the vehicle approach warning buzzer is sounding, brake control is not performed to decelerate the vehicle

Electronically controlled brake system

CAN communication system

Driving support ECU assembly

ECM

Even though the SET function is operating, the cruise SET indicator does not illuminate

CAN communication system

Cruise SET indicator light circuit

Combination meter assembly

ECM

The cruise control indicator remains illuminated

CAN communication system

Cruise main indicator light circuit

Combination meter assembly

ECM

Indicators are not displayed on the multi-information display in the combination meter assembly

CAN communication system

Combination meter assembly

ECM

A buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled

CAN communication system

Combination meter assembly

ECM

*1: When the "Radar Cruise Control Unavailable" message is displayed and "Front Radar Incorrect Axis Gap (Vertical) History: ON" is output, the millimeter wave radar sensor assembly may be automatically performing beam axis calibration. In this case, the display is turned off due to beam axis adjustment being performed. Automatic calibration is complete when the "Radar Cruise Control Unavailable" message turns off.

*2: w/ Shift Paddle Switch

    Precaution

    Road Test

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