Note
Before replacing the hybrid vehicle control ECU, 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.
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.
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 main switch (ON/OFF button) | CAN communication system | |
| Cruise control switch circuit | ||
| Cruise main indicator light circuit | ||
| Combination meter assembly (Meter circuit plate) | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode | CAN communication system | |
| Cruise control switch circuit | ||
| Combination meter assembly (Meter circuit plate) | ||
| Hybrid vehicle control ECU | ||
| The vehicle-to-vehicle distance cannot be changed | CAN communication system | |
| Distance control switch circuit | ||
| Combination meter assembly (Meter circuit plate) | ||
| Driving support ECU assembly | ||
| Vehicle speed setting cannot be performed (in constant speed control mode) | Fail-safe chart | |
| CAN communication system | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Hybrid control system | ||
| Electronically controlled brake system | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode) | Fail-safe chart | |
| Forward recognition camera is temporarily unavailable | ||
| Millimeter wave radar sensor is dirty | ||
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| CAN communication system | ||
| Cruise control switch circuit | ||
| Hybrid control system | ||
| Millimeter wave radar sensor assembly | ||
| Forward recognition camera | ||
| Electronically controlled brake system | ||
| Combination meter assembly (Meter circuit plate) | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode) | Fail-safe chart | |
| CAN communication system | ||
| Cruise control switch circuit | ||
| Stop light switch circuit | ||
| Hybrid control system | ||
| Electronically controlled brake system | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode) | Fail-safe chart | |
| Forward recognition camera is temporarily unavailable | ||
| Millimeter wave radar sensor is dirty | ||
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| CAN communication system | ||
| Cruise control switch circuit | ||
| Hybrid control system | ||
| Millimeter wave radar sensor assembly | ||
| Forward recognition camera | ||
| Electronically controlled brake system | ||
| Combination meter assembly (Meter circuit plate) | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| Hunting/vehicle speed is not constant (in constant speed control mode) | CAN communication system | |
| Electronically controlled brake system | ||
| Hybrid vehicle control ECU | ||
| Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode) | Millimeter wave radar sensor assembly is dirty | |
| Millimeter wave radar sensor assembly beam axis not adjusted | ||
| CAN communication system | ||
| Electronically controlled brake system | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| 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 | |
| Hybrid vehicle control ECU | ||
| Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system | Shift lock control unit assembly (Shift sensor) | |
| Hybrid control system | ||
| Hybrid vehicle control ECU | ||
| Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system | Stop light switch circuit | |
| Hybrid vehicle control ECU | ||
| Control cannot be canceled while the vehicle is stopped. | Fail-safe chart | |
| Seat belt warning system (w/ Occupant classification system) | ||
| Seat belt warning system (w/o Occupant classification system) | ||
| Front door courtesy switch circuit | ||
| Back door courtesy switch circuit | ||
| Even though the parking brake is operating, control cannot be canceled (w/ Full-speed Following Function) | CAN communication system | |
| Parking brake switch | ||
| Driving support ECU assembly | ||
| Even though the millimeter wave radar sensor is not dirty, the warning message "Clean Sensor" is displayed | Millimeter wave radar sensor assembly | |
| The vehicle approach warning buzzer does not sound | Skid control buzzer circuit | |
| Check millimeter wave radar sensor assembly installation position | ||
| Check installation of forward recognition camera | ||
| Forward recognition camera | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU assembly | ||
| Even though the vehicle approach warning buzzer is sounding, brake control is not performed when decelerating | CAN communication system | |
| Electronically controlled brake system | ||
| Driving support ECU assembly | ||
| Hybrid vehicle control ECU | ||
| Even though the SET function is operating, the cruise SET indicator does not illuminate | CAN communication system | |
| Cruise SET indicator light circuit | ||
| Combination meter assembly (Meter circuit plate) | ||
| Hybrid vehicle control ECU | ||
| The cruise control indicator remains illuminated | CAN communication system | |
| Combination meter assembly (Meter circuit plate) | ||
| Hybrid vehicle control ECU | ||
| Indicators are not illuminated on the multi-information display in the combination meter assembly | CAN communication system | |
| Combination meter assembly (Meter circuit plate) | ||
| Hybrid vehicle control ECU | ||
| The buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled | CAN communication system | |
| Combination meter assembly (No. 2 Meter circuit plate) | ||
| Hybrid vehicle control ECU |