Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2013 Toyota Prius FourFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
WARNING: This page is about a different variant/trim than selected.
HINT:
- 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.
CRUISE CONTROL SYSTEM
| Symptom | Suspected Area | Refer to |
|---|---|---|
| The cruise control system cannot be turned on using the cruise control switch (ON-OFF button). | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Cruise main indicator light circuit | Refer to Cruise Main Indicator Light Circuit | |
| Power management control ECU | Refer to REMOVAL | |
| Vehicle speed cannot be set (the cruise control indicator light illuminates 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 | Refer to Cruise Control Switch Circuit |
| Power management control ECU | Refer to REMOVAL | |
| Vehicle speed cannot be set (the cruise control indicator light illuminates 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 | Refer to DTC P0571: Brake Switch "A" Circuit |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| Vehicle speed control by the cruise control system is automatically canceled after it has started. | Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| 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.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| Pulling back on the cruise control switch does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes out.) | Power management control ECU | Refer to REMOVAL |
| 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.) | Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| 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 out.) | Power management control ECU | Refer to REMOVAL |
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light remains illuminated.) | Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit |
| Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| Depressing the brake pedal does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes out.) | Power management control ECU | Refer to REMOVAL |
| Moving the shift lever does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light remains illuminated.) | Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Shift position sensor | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| Moving the shift lever does not cancel vehicle speed control by the cruise control system. (The cruise control indicator light goes out.) | Power management control ECU | Refer to REMOVAL |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| SFI system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| The cruise control SET indicator light does not illuminate. (Vehicle speed can be set) | Cruise SET indicator light circuit | Refer to Cruise SET Indicator Light Circuit |
| Combination meter | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| CAN communication system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Power management control ECU | Refer to REMOVAL | |
| The cruise control indicator light remains blinking. | TC and CG terminal circuit | Refer to TC and CG Terminal Circuit |
| Power management control ECU | Refer to REMOVAL |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.