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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Cruise Control / Dynamic Radar Cruise Control System(for Hv Model) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the hybrid vehicle control ECU, 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
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
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
	Hybrid control system
	Electronically controlled brake system
	Driving support ECU assembly
	Hybrid vehicle control ECU
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
	Hybrid control system
	Millimeter wave radar sensor assembly
	Forward recognition camera
	Electronically controlled brake system
	Combination meter assembly
	Driving support ECU assembly
	Hybrid vehicle control ECU
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
	Hybrid control system
	Electronically controlled brake system
	Driving support ECU assembly
	Hybrid vehicle control ECU
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
	Hybrid control system
	Millimeter wave radar sensor assembly
	Forward recognition camera
	Electronically controlled brake system
	Combination meter assembly
	Driving support ECU assembly
	Hybrid vehicle control ECU
Hunting/vehicle speed is not constant (in constant speed control mode)	CAN communication system
	Electronically controlled brake system
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
Vehicle speed control by the dynamic radar cruise control system is not canceled when the CANCEL switch is pushed	Steering pad switch circuit
	Hybrid vehicle control ECU
Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system	Shift lever position sensor
	Shift lock control unit assembly
	Hybrid control system
	Hybrid vehicle control ECU
Vehicle speed control by the dynamic radar cruise control system is not canceled when a shift paddle switch is operated*2	Hybrid control system
	Shift paddle switch circuit
	Hybrid vehicle control ECU
Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system	Stop light switch circuit
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
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
	Hybrid vehicle control ECU
The cruise control indicator remains illuminated	CAN communication system
	Cruise main indicator light circuit
	Combination meter assembly
	Hybrid vehicle control ECU
Indicators are not displayed on the multi-information display in the combination meter assembly	CAN communication system
	Combination meter assembly
	Hybrid vehicle control ECU
A buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled	CAN communication system
	Combination meter assembly
	Hybrid vehicle control ECU

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

Precaution

Road Test

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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual