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 | See page |
|---|---|---|
| The cruise control system cannot be turned on using the cruise control switch (ON-OFF button). | Cruise control switch circuit | |
| Cruise main indicator light circuit | ||
| Hybrid vehicle control ECU | ||
| Vehicle speed cannot be set (the cruise control indicator light illuminates in green when the cruise control system is turned on using the cruise control switch (ON-OFF button), but the cruise control indicator light goes out when the cruise control switch is pushed to -/SET). | Cruise control switch circuit | |
| Hybrid vehicle control ECU | ||
| Vehicle speed cannot be set (the cruise control indicator light illuminates in green when the cruise control system is turned on using the cruise control switch (ON-OFF button), and it remains illuminated when the cruise control switch is pushed to -/SET). | Stop light switch circuit | |
| Vehicle speed sensor circuit | ||
| Cruise control switch circuit | ||
| Hybrid control system | ||
| Electronically controlled brake system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Hybrid vehicle control ECU | ||
| Vehicle speed control by the cruise control system is automatically canceled after it has started. | Stop light switch circuit | |
| Hybrid control system | ||
| Electronically controlled brake system | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Cruise control switch circuit | ||
| Vehicle speed sensor circuit | ||
| Hybrid vehicle control ECU | ||
| Pulling back on the cruise control switch does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light remains illuminated in green.) | Cruise control switch circuit | |
| Combination meter assembly | ||
| Hybrid vehicle control ECU | ||
| Pulling back on the cruise control switch does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes off.) | Hybrid vehicle control ECU | |
| Vehicle speed control by the cruise control system is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator light remains illuminated in green.) | Vehicle speed sensor circuit | |
| Combination meter assembly | ||
| Hybrid vehicle control ECU | ||
| Vehicle speed control by the cruise control system is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator light goes off.) | Hybrid vehicle control ECU | |
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light remains illuminated in green.) | Stop light switch circuit | |
| Combination meter assembly | ||
| Hybrid vehicle control ECU | ||
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes off.) | Hybrid vehicle control ECU | |
| Moving the shift lever does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light remains illuminated in green.) | Hybrid control system | |
| Shift position sensor | ||
| Combination meter assembly | ||
| Hybrid vehicle control ECU | ||
| Moving the shift lever does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes off.) | Hybrid vehicle control ECU | |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | |
| SFI system | ||
| Hybrid control system | ||
| Hybrid vehicle control ECU | ||
| The cruise control SET indicator light does not illuminate. (Vehicle speed can be set) | Cruise SET indicator light circuit | |
| Combination meter assembly | ||
| CAN communication system (w/ Toyota Safety Sense) | ||
| CAN communication system (w/o Toyota Safety Sense) | ||
| Hybrid vehicle control ECU | ||
| The cruise control indicator light (green) remains blinking. | TC and CG terminal circuit | |
| Hybrid vehicle control ECU | ||
| The cruise control SET indicator light does not illuminate. (Vehicle speed can be set) | Cruise SET indicator light circuit | |
| Hybrid vehicle control ECU |