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 replacing the brake booster with master cylinder assembly (skid control ECU), perform linear valve offset learning and calibration.
Perform Registration (VIN registration) when replacing the EV control ECU.
| Symptom | Suspected Area | Link |
|---|---|---|
| The cruise control main switch cannot be turned on. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Cruise control switch circuit | ||
| Cruise main indicator light circuit | ||
| Combination meter assembly | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| EV Control ECU | ||
| Switching using the MODE switch is not possible. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Cruise control switch circuit | ||
| Combination meter assembly | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| EV Control ECU | ||
| Switching using the vehicle-to-vehicle switch is not possible. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Distance control switch circuit | ||
| Combination meter assembly | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cannot set in the constant speed control mode. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| Hybrid transaxle system | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Integration control and panel assembly | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cannot set in the vehicle-to-vehicle distance control mode. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| Hybrid transaxle system | ||
| 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 | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Canceled during constant speed control. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| Hybrid transaxle system | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Integration control and panel assembly | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Canceled during vehicle-to-vehicle control. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| Millimeter wave radar sensor assembly is dirty | - | |
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| Cruise control switch circuit | ||
| Wiper signal circuit | ||
| Hybrid transaxle system | ||
| Millimeter wave radar sensor assembly | ||
| Integration control and panel assembly | ||
| Combination meter assembly | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Hunting (vehicle speed does not stabilize) during constant speed control. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| Millimeter wave radar sensor assembly is dirty | - | |
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Hunting (vehicle speed does not stabilize) during vehicle-to-vehicle control. | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cannot cancel by CANCEL switch operation. | Cruise control switch circuit | |
| EV Control ECU | ||
| Cannot cancel by shift lever operation. | Hybrid transaxle system | |
| Shift lock control unit assembly | ||
| Shift lever position sensor | ||
| EV Control ECU | ||
| Cannot cancel by brake operation. | Stop light switch circuit | |
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cannot cancel by wiper HI operation. | Wiper signal circuit | |
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| 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. | Driving support buzzer circuit | |
| Check millimeter wave radar sensor assembly installation position | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Even though the proximity warning buzzer sounds, brake control is not performed (when decelerating). | CAN communication system (for RHD) | |
| CAN communication system (for LHD) | ||
| Electronically controlled brake system | ||
| EV Control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cruise control SET indicator light is not displayed (during cruise control). | Cruise set indicator light circuit | |
| Combination meter assembly | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Cruise control indicator light continues to display. | Driving support ECU assembly (for LHD) | |
| Driving support ECU assembly (for RHD) | ||
| 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 |