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.
| Symptom | Suspected Area | Link |
|---|---|---|
| The dynamic radar cruise control system cannot be turned on using the cruise control switch (ON/OFF button). | Driving support ECU power source circuit | |
| Cruise control switch circuit | ||
| Cruise main indicator light circuit | ||
| Driving support ECU assembly | ||
| Cannot change between vehicle-to-vehicle distance control mode and constant speed control mode. | Cruise control switch circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Set distance cannot be changed. | Distance control switch circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Cannot select vehicle-to-vehicle distance control mode. | Combination meter assembly | |
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly | ||
| Vehicle speed setting cannot be performed. (The cruise control indicator remains illuminated in the combination meter assembly when cruise control system is turned on using the cruise control switch (ON/OFF button), but turns off when the SET function is operated.) | Cruise control switch circuit | |
| Driving support ECU assembly | ||
| Vehicle speed setting cannot be performed with constant speed control mode. (The cruise control indicator remains illuminated in the combination meter assembly when cruise control system is turned on using the cruise control switch (ON/OFF button), and remains on when the SET function is operated.) | Stop light switch assembly circuit | |
| Vehicle speed sensor circuit | ||
| Cruise control switch circuit | ||
| Transmission control switch circuit (for 8AR-FTS) | ||
| Transmission control switch circuit (for 2GR-FSE) | ||
| Shift paddle switch circuit (for 8AR-FTS) | ||
| Shift paddle switch circuit (for 2GR-FSE) | ||
| Vehicle stability control system | ||
| Driving support ECU assembly | ||
| Vehicle speed setting cannot be performed with vehicle-to-vehicle distance control mode. (The cruise control indicator remains illuminated in the combination meter assembly when cruise control system is turned on using the cruise control switch (ON/OFF button), and remains on when the SET function is operated.) | Millimeter wave radar sensor assembly | |
| Stop light switch assembly circuit | ||
| Vehicle speed sensor circuit | ||
| Cruise control switch circuit | ||
| Transmission control switch circuit (for 8AR-FTS) | ||
| Transmission control switch circuit (for 2GR-FSE) | ||
| Shift paddle switch circuit (for 8AR-FTS) | ||
| Shift paddle switch circuit (for 2GR-FSE) | ||
| Wiper signal circuit | ||
| Vehicle stability control system | ||
| Driving support ECU assembly | ||
| While vehicle is driven with the dynamic radar cruise control system controlling vehicle speed, the control of vehicle speed is canceled. | Stop light switch assembly circuit | |
| Transmission control switch circuit (for 8AR-FTS) | ||
| Transmission control switch circuit (for 2GR-FSE) | ||
| Shift paddle switch circuit (for 8AR-FTS) | ||
| Shift paddle switch circuit (for 2GR-FSE) | ||
| Vehicle stability control system | ||
| Cruise control switch circuit | ||
| Combination meter assembly | ||
| Vehicle speed sensor circuit | ||
| Wiper signal circuit | ||
| Driving support ECU assembly | ||
| Pulling back on the cruise control switch does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator remains illuminated.) | Cruise control switch circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Pulling back on the cruise control switch does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator (Vehicle-to-vehicle distance control mode) goes off.) | Driving support ECU assembly | |
| Vehicle speed control by the dynamic radar cruise control system is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator remains illuminated.) | Vehicle speed sensor circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Vehicle speed control by the dynamic radar cruise control system is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator (Vehicle-to-vehicle distance control mode) goes off.) | Driving support ECU assembly | |
| Depressing the brake pedal does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator remains illuminated.) | Stop light switch assembly circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Depressing the brake pedal does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator (Vehicle-to-vehicle distance control mode) goes off.) | Driving support ECU assembly | |
| Vehicle speed control by the dynamic radar cruise control system is not canceled when the wipers operate on HI. (The cruise control indicator remains illuminated.) | Stop light switch assembly circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Vehicle speed control by the dynamic radar cruise control system is not canceled when the wipers operate on HI. (The cruise control indicator (Vehicle-to-vehicle distance control mode) goes off.) | Driving support ECU assembly | |
| Vehicle speed control by the dynamic radar cruise control system is not canceled when the wipers operate on HI. (The cruise control indicator light remains illuminated.) | Wiper signal circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Vehicle speed control by the dynamic radar cruise control system is not canceled when the wipers operate on HI. (The cruise control indicator (Vehicle-to-vehicle distance control mode) light goes off.) | Driving support ECU assembly | |
| Moving the shift lever does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator remains illuminated.) | Transmission control switch circuit (for 8AR-FTS) | |
| Transmission control switch circuit (for 2GR-FSE) | ||
| Shift paddle switch circuit (for 8AR-FTS) | ||
| Shift paddle switch circuit (for 2GR-FSE) | ||
| Combination meter assembly | ||
| Driving support ECU assembly | ||
| Moving the shift lever does not cancel vehicle speed control by the dynamic radar cruise control system. (The cruise control indicator (Vehicle-to-vehicle distance control mode) goes off.) | Driving support ECU assembly | |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | |
| SFI system (for 2GR-FSE) | ||
| SFI system (for 8AR-FTS (w/ Canister Pump Module)) | ||
| SFI system (for 8AR-FTS (w/o Canister Pump Module)) | ||
| Driving support ECU assembly | ||
| Even though the front millimeter wave radar sensor assembly is not dirty, the warning message "Clean Radar Sensor" is displayed. | Millimeter wave radar sensor assembly is dirty | - |
| Adjust front millimeter wave radar sensor assembly | ||
| Millimeter wave radar sensor assembly | ||
| The beam axis of the millimeter wave radar sensor cannot be adjusted. | Check position, distance and angle of reflector | |
| Check installation of millimeter wave radar sensor assembly | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly | ||
| The warning buzzer does not sound. | Skid control buzzer circuit | |
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly | ||
| No brake control (when decelerating) | Vehicle stability control system | |
| Driving support ECU assembly | ||
| The cruise control SET indicator does not illuminate. (Vehicle speed can be set) | Cruise control SET indicator light circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly |