Toyota Yaris: Dynamic Radar Cruise Control System / Problem Symptoms Table

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the ECM, refer to Service Bulletin.
When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle and a DTC may be stored.
When the millimeter wave radar sensor assembly has been replaced with a new one, it is necessary to perform millimeter wave radar sensor assembly beam axis alignment and to clear the vehicle control history. Before performing the Driving Adjustment, make sure to read Before Starting Driving Adjustment.
HINT:

Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.

Triangle Target: Click here

Flat Surface Target: Click here

Driving Adjustment: Click here
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 and a DTC may be stored.
When the forward recognition camera is replaced with a new one or the windshield glass is replaced or removed/installed, make sure to read Before Starting Adjustment, then perform optical axis alignment for the forward recognition camera and clear the vehicle control history for each system.
HINT:

Forward recognition camera axis alignment can be performed by using either One Time Recognition, Sequential Recognition or Driving Adjustment.

One Time Recognition: Click here

Sequential Recognition: Click here

Driving Adjustment: Click here

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.
Determine the problem systems, then perform the respective inspection procedures.
By using the vehicle control history, various control parameter history can be checked.

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
	Millimeter wave radar sensor 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
	ECM
The vehicle-to-vehicle distance cannot be changed	CAN communication system
	Distance control switch circuit
	Forward recognition camera
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
	Manual transaxle system
	Vehicle stability control system
	Millimeter wave radar sensor assembly
	ECM
Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode)	Front Radar Sensor Temporary Unavailable (Optical Axis Misalignment) history
	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 HINT: Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.	Triangle Target: Click here Flat Surface Target: Click here Driving Adjustment: Click here
	CAN communication system
	Steering pad switch circuit
	Neutral Position Switch Circuit
	Manual transaxle system
	Millimeter wave radar sensor assembly
	Forward recognition camera
	Vehicle stability control system
	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
	Manual transaxle system
	Vehicle stability control system
	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 HINT: Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.	Triangle Target: Click here Flat Surface Target: Click here Driving Adjustment: Click here
	CAN communication system
	Steering pad switch circuit
	Manual transaxle system
	Millimeter wave radar sensor assembly
	Forward recognition camera
	Vehicle stability control system
	ECM
Hunting/vehicle speed is not constant (in constant speed control mode)	CAN communication system
	Vehicle stability control 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 HINT: Beam axis alignment of the millimeter wave radar sensor assembly can be performed using either Triangle Target, Flat Surface Target or Driving Adjustment.	Triangle Target: Click here Flat Surface Target: Click here Driving Adjustment: Click here
	CAN communication system
	Vehicle stability control system
	Millimeter wave radar sensor 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	ECM
	Neutral Position Switch Circuit
Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system	Stop light switch circuit
	ECM
Depressing the clutch pedal does not cancel control of vehicle speed by the dynamic radar cruise control system	ECM
Even though the millimeter wave radar sensor assembly and forward recognition camera are not dirty, the warning message "Radar Cruise Control Unavailable See Owner's Manual" is displayed	Millimeter wave radar sensor assembly
	Forward recognition camera
The vehicle approach warning buzzer does not sound	Meter / gauge system
	Check millimeter wave radar sensor assembly installation position
	Check installation of forward recognition camera
	Forward recognition camera
	Millimeter wave radar sensor assembly
Even though the vehicle approach warning buzzer is sounding, brake control is not performed to decelerate the vehicle	Vehicle stability control system
	CAN communication system
	Millimeter wave radar sensor assembly
	ECM
Even though the SET function is operating, the cruise SET indicator does not illuminate	CAN communication system
	Cruise SET indicator light circuit
	ECM
The cruise control indicator remains illuminated	CAN communication system
	Cruise main indicator light circuit
	ECM
Indicators are not displayed on the multi-information display in the combination meter assembly	CAN communication system
	ECM
A buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled	CAN communication system
	ECM

Operation Check

OPERATION CHECK INPUT SIGNAL CHECK (a) Connect the GTS to the DLC3. (b) Check the steering pad switch assembly using the Data List function of the GTS (cruise control main switch, -SET switch, +RES switch and CANCEL switch)...

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