DYNAMIC RADAR CRUISE CONTROL SYSTEM PROBLEM SYMPTOMS TABLE

Note

Before replacing the ECM, refer to Service Bulletin.
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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Tech Tips

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 (ON-OFF)	CAN communication system	Click here
	Cruise control switch circuit	Click here
	Cruise main indicator light circuit	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode	CAN communication system	Click here
	Cruise control switch circuit	Click here
	Combination meter assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
The vehicle-to-vehicle distance cannot be changed	CAN communication system	Click here
	Vehicle-to-vehicle distance control switch circuit	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
Vehicle speed setting cannot be performed (in constant speed control mode)	Fail-safe chart	Click here
	CAN communication system	Click here
	Cruise control switch circuit	Click here
	Stop light switch circuit (for 3ZR-FAE)	Click here
	Stop light switch circuit (for 8AR-FTS)	Click here
	SFI system (for 3ZR-FAE)	Click here
	SFI system (for 8AR-FTS (w/ Canister Pump Module))	Click here
	SFI system (for 8AR-FTS (w/o Canister Pump Module))	Click here
	Vehicle stability control system	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
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*	Click here
	Fail-safe chart	Click here
	Forward recognition camera is temporarily unavailable	Click here
	Millimeter wave radar sensor is dirty	Click here
	Millimeter wave radar sensor assembly beam axis not adjusted	Click here
	CAN communication system	Click here
	Cruise control switch circuit	Click here
	SFI system (for 3ZR-FAE)	Click here
	SFI system (for 8AR-FTS (w/ Canister Pump Module))	Click here
	SFI system (for 8AR-FTS (w/o Canister Pump Module))	Click here
	Millimeter wave radar sensor assembly	Click here
	Forward recognition camera	Click here
	Vehicle stability control system	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode)	Fail-safe chart	Click here
	CAN communication system	Click here
	Cruise control switch circuit	Click here
	Stop light switch circuit (for 3ZR-FAE)	Click here
	Stop light switch circuit (for 8AR-FTS)	Click here
	SFI system (for 3ZR-FAE)	Click here
	SFI system (for 8AR-FTS (w/ Canister Pump Module))	Click here
	SFI system (for 8AR-FTS (w/o Canister Pump Module))	Click here
	Vehicle stability control system	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode)	Fail-safe chart	Click here
	Forward recognition camera is temporarily unavailable	Click here
	Millimeter wave radar sensor is dirty	Click here
	Millimeter wave radar sensor assembly beam axis not adjusted	Click here
	CAN communication system	Click here
	Cruise control switch circuit	Click here
	SFI system (for 3ZR-FAE)	Click here
	SFI system (for 8AR-FTS (w/ Canister Pump Module))	Click here
	SFI system (for 8AR-FTS (w/o Canister Pump Module))	Click here
	Millimeter wave radar sensor assembly	Click here
	Forward recognition camera	Click here
	Vehicle stability control system	Click here
	Combination meter assembly	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Hunting/vehicle speed is not constant (in constant speed control mode)	CAN communication system	Click here
	Vehicle stability control system	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode)	Millimeter wave radar sensor assembly is dirty	Click here
	Millimeter wave radar sensor assembly beam axis not adjusted	Click here
	CAN communication system	Click here
	Vehicle stability control system	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Pulling the cruise control main switch to CANCEL does not cancel control of vehicle speed by the dynamic radar cruise control system	Cruise control switch circuit	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system	Park/neutral position switch assembly (for U661E)	Click here
	Park/neutral position switch assembly (for U661F)	Click here
	Park/neutral position switch assembly (for K114)	Click here
	Park/neutral position switch assembly (for K114F)	Click here
	Transmission floor shift assembly (for U661E)	Click here
	Transmission floor shift assembly (for U661F)	Click here
	Transmission floor shift assembly (for K114)	Click here
	Transmission floor shift assembly (for K114F)	Click here
	Automatic transaxle system (for U661E)	Click here
	Automatic transaxle system (for U661F)	Click here
	CVT system (for K114)	Click here
	CVT system (for K114F)	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system	Stop light switch circuit (for 3ZR-FAE)	Click here
	Stop light switch circuit (for 8AR-FTS)	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Control cannot be canceled while the vehicle is stopped.	Fail-safe chart	Click here
	Seat belt warning system (w/ Occupant Classification System)	Click here
	Seat belt warning system (w/o Occupant Classification System)	Click here
	Theft deterrent system	Click here
	Door courtesy switch circuit	Click here
Even though the electric parking brake is operating, control cannot be canceled (w/ Full-speed Following Function)	CAN communication system	Click here
	Parking brake ECU assembly (Brake actuator assembly)	Click here
	Driving support ECU assembly	Click here
Even though the millimeter wave radar sensor is not dirty, the warning message "Radar Cruise Control Unavailable Clean Sensor" is displayed	Millimeter wave radar sensor assembly	Click here
The vehicle approach warning buzzer does not sound	Skid control buzzer circuit	Click here
	Check millimeter wave radar sensor assembly installation position	Click here
	Check installation of forward recognition camera	Click here
	Forward recognition camera	Click here
	Millimeter wave radar sensor assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
	Driving support ECU assembly	Click here
Even though the vehicle approach warning buzzer is sounding, brake control is not performed when decelerating	CAN communication system	Click here
	Vehicle stability control system	Click here
	Driving support ECU assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Even though the SET function is operating, the cruise SET indicator does not illuminate	CAN communication system	Click here
	Cruise SET indicator light circuit	Click here
	Combination meter assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
The cruise control indicator remains illuminated	CAN communication system	Click here
	Combination meter assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
Indicators are not illuminated on the multi-information display in the combination meter assembly	CAN communication system	Click here
	Combination meter assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here
The buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled	CAN communication system	Click here
	Combination meter assembly	Click here
	ECM (for 3ZR-FAE)	Click here
	ECM (for 8AR-FTS)	Click here

*: 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 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" messages turns off.