Problem Symptoms Table [09/2017 - ]

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.
Refer to ADJUSTMENT [10/2015 - ]
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.
Refer to ADJUSTMENT [09/2017 - ]

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 (ON/OFF button)	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Cruise main indicator light circuit	Refer to Cruise Main Indicator Light Circuit [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
The vehicle-to-vehicle distance cannot be changed	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Distance control switch circuit	Refer to Distance Control Switch Circuit [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Vehicle speed setting cannot be performed (in constant speed control mode)	Fail-safe chart	Refer to FAIL-SAFE CHART [09/2017 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Stop light switch circuit	Refer to DTC C1A05: Stop Light Switch Circuit [10/2015 - ]
	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode)	Fail-safe chart	Refer to FAIL-SAFE CHART [09/2017 - ]
	Forward recognition camera is temporarily unavailable	Refer to FAIL-SAFE CHART [09/2017 - ]
	Millimeter wave radar sensor is dirty	Refer to FAIL-SAFE CHART [09/2017 - ]
	Millimeter wave radar sensor assembly beam axis not adjusted	Refer to ADJUSTMENT [10/2015 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Millimeter wave radar sensor assembly	Refer to REMOVAL [09/2017 - ]
	Forward recognition camera	Refer to REMOVAL [09/2017 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode)	Fail-safe chart	Refer to FAIL-SAFE CHART [09/2017 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Stop light switch circuit	Refer to DTC C1A05: Stop Light Switch Circuit [10/2015 - ]
	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode)	Fail-safe chart	Refer to FAIL-SAFE CHART [09/2017 - ]
	Forward recognition camera is temporarily unavailable	Refer to FAIL-SAFE CHART [09/2017 - ]
	Millimeter wave radar sensor is dirty	Refer to FAIL-SAFE CHART [09/2017 - ]
	Millimeter wave radar sensor assembly beam axis not adjusted	Refer to ADJUSTMENT [10/2015 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Millimeter wave radar sensor assembly	Refer to REMOVAL [09/2017 - ]
	Forward recognition camera	Refer to REMOVAL [09/2017 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Hunting/vehicle speed is not constant (in constant speed control mode)	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode)	Millimeter wave radar sensor assembly is dirty	Refer to FAIL-SAFE CHART [09/2017 - ]
	Millimeter wave radar sensor assembly beam axis misalignment (before diagnostic judgment)	Refer to ADJUSTMENT [10/2015 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Pulling the cruise control main switch (ON/OFF button) to CANCEL does not cancel control of vehicle speed by the dynamic radar cruise control system	Cruise control switch circuit	Refer to Cruise Control Switch Circuit [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system	Park/neutral position switch	Refer to INSPECTION [10/2015 - ]
	Transmission floor shift assembly	Refer to INSPECTION [10/2015 - ]
	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Vehicle speed control by the cruise control system is not canceled when the paddle shift switch is operated	Automatic transmission system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Transmission shift switch circuit	Refer to INSPECTION [10/2015 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system	Stop light switch circuit	Refer to DTC C1A05: Stop Light Switch Circuit [10/2015 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Control cannot be canceled while the vehicle is stopped.	Fail-safe chart	Refer to FAIL-SAFE CHART [09/2017 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Seat belt warning system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Theft deterrent system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Door courtesy switch circuit	Refer to Door Courtesy Switch Circuit [10/2015 - ]
	Parking brake ECU assembly (Brake actuator assembly)	Refer to REMOVAL [09/2017 - ]
Even though the electric parking brake is operating, control cannot be canceled	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Parking brake ECU assembly (Brake actuator assembly)	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Even though the emblem and the millimeter wave radar sensor are not dirty, the warning message "Clean Sensor" is displayed	Millimeter wave radar sensor assembly	Refer to REMOVAL [09/2017 - ]
The vehicle approach warning buzzer does not sound	Skid control buzzer circuit	Refer to DTC C1A4A: Skid Control Buzzer Circuit [09/2017 - ]
	Check millimeter wave radar sensor assembly installation position	Refer to INSTALLATION [10/2015 - ]
	Check installation of forward recognition camera	Refer to INSTALLATION [09/2017 - ]
	Forward recognition camera	Refer to REMOVAL [09/2017 - ]
	Millimeter wave radar sensor assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Even though the vehicle approach warning buzzer is sounding, brake control is not performed when decelerating	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Vehicle stability control system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
	ECM	Refer to REMOVAL [09/2017 - ]
Even though the SET function is operating, the cruise SET indicator does not illuminate	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Cruise SET indicator light circuit	Refer to Cruise SET Indicator Light Circuit [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
The cruise control indicator remains illuminated	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
Indicators are not illuminated on the multi-information display in the combination meter assembly	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]
The buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled	CAN communication system	Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]
	Combination meter assembly	Refer to REMOVAL [09/2017 - ]
	Driving support ECU assembly	Refer to REMOVAL [09/2017 - ]