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.
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.
When replacing the combination meter assembly, make sure to replace it with a new one.
After the brake actuator assembly (skid control ECU) is replaced, perform the yaw rate sensor and G sensor zero point calibration and store the system information.
If the ECM is replaced, initialization must be performed.
| Symptom | Suspected Area | Link |
|---|---|---|
| The cruise control main switch cannot be turned on. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Cruise control switch circuit | ||
| Cruise main indicator light circuit | ||
| Combination meter assembly | ||
| ECM | ||
| Switching using the MODE switch is not possible. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Cruise control switch circuit | ||
| Combination meter assembly | ||
| ECM | ||
| Switching using the vehicle-to-vehicle switch is not possible. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Distance control switch circuit | ||
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Cannot set in the constant speed control mode. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| Automatic transaxle system (for U661E) | ||
| Automatic transaxle system (for U661F) | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Integration control and panel assembly | ||
| ECM | ||
| Driving support ECU assembly | ||
| Cannot set in the vehicle-to-vehicle distance control mode. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| Automatic transaxle system (for U661E) | ||
| Automatic transaxle system (for U661F) | ||
| Millimeter wave radar sensor assembly is dirty | - | |
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| Cruise control switch circuit | ||
| Wiper signal circuit | ||
| Millimeter wave radar sensor assembly | ||
| Integration control and panel assembly | ||
| Combination meter assembly | ||
| ECM | ||
| Driving support ECU assembly | ||
| Canceled during constant speed control. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| Automatic transaxle system (for U661E) | ||
| Automatic transaxle system (for U661F) | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Integration control and panel assembly | ||
| ECM | ||
| Driving support ECU assembly | ||
| Canceled during vehicle-to-vehicle control. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| Millimeter wave radar sensor assembly is dirty | - | |
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| Cruise control switch circuit | ||
| Wiper signal circuit | ||
| Automatic transaxle system (for U661E) | ||
| Automatic transaxle system (for U661F) | ||
| Millimeter wave radar sensor assembly | ||
| Integration control and panel assembly | ||
| Combination meter assembly | ||
| ECM | ||
| Driving support ECU assembly | ||
| Hunting (vehicle speed does not stabilize) during constant speed control. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| Millimeter wave radar sensor assembly is dirty | - | |
| ECM | ||
| Driving support ECU assembly | ||
| Hunting (vehicle speed does not stabilize) during vehicle-to-vehicle control. | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| ECM | ||
| Driving support ECU assembly | ||
| Cannot cancel by CANCEL switch operation. | Cruise control switch circuit | |
| ECM | ||
| Driving support ECU assembly | ||
| Cannot cancel by shift lever or transmission shift switch operation. | Vehicle stability control system | |
| Transmission floor shift assembly (for U661E) | ||
| Transmission floor shift assembly (for U661F) | ||
| Automatic transaxle system (for U661E) | ||
| Automatic transaxle system (for U661F) | ||
| ECM | ||
| Cannot cancel by brake operation. | Stop light switch circuit | |
| Driving support ECU assembly | ||
| Cannot cancel by wiper HI operation. | Wiper signal circuit | |
| ECM | ||
| Driving support ECU assembly | ||
| Control cannot be canceled while vehicle is stopped. | Seat belt warning system (w/ Occupant Classification System) | |
| Seat belt warning system (w/o Occupant Classification System) | ||
| Theft deterrent system | ||
| Door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| Even though the millimeter wave radar sensor is not dirty, "Clean Sensor" is displayed. | Millimeter wave radar sensor assembly | |
| The warning buzzer does not sound. | Skid control buzzer circuit | |
| Check millimeter wave radar sensor assembly installation position | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly | ||
| Even though the proximity warning buzzer sounds, brake control is not performed (when decelerating). | CAN communication system (for LHD) | |
| CAN communication system (for RHD) | ||
| Vehicle stability control system | ||
| ECM | ||
| Driving support ECU assembly | ||
| Cruise control SET indicator light is not displayed (during cruise control). | Cruise set indicator light circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Cruise control indicator light continues to display. | Driving support ECU assembly | |
| Nothing displayed on the multi-information display in combination meter assembly. | Combination meter assembly | |
| Even though cruise control system is canceled, buzzer does not sound. | Combination meter assembly | |
| Even though the electric parking brake is operating, control cannot be canceled (w/ Full-speed Following Function). | Parking brake ECU assembly | |
| Driving support ECU assembly |