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.
2012 Toyota Prius Plug-inFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
PLUG-IN CHARGE CONTROL SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Plug-in Charging Does not Start | Auxiliary battery | Refer to ON-VEHICLE INSPECTION |
| ECU power source circuit (Plugin charge control ECU assembly) | Refer to ECU Power Source Circuit | |
| ECU power source circuit (Power management control ECU) | Refer to ECU Power Source Circuit | |
| Plug-in charging does not start | Refer to Plug-in Charging Does not Start | |
| Control pilot signal circuit | Refer to Control Pilot Signal Circuit | |
| Electric vehicle charger cable assembly | Refer to ON-VEHICLE INSPECTION | |
| Plugin charge control ECU assembly | Refer to COMPONENTS | |
| Electric vehicle charger assembly | Refer to COMPONENTS | |
| Charging is Cancelled while Plug-in Charging | Electric vehicle charger cable assembly | Refer to ON-VEHICLE INSPECTION |
| Charging stops during plug-in charging | Refer to Charging Stops during Plug-in Charging | |
| Control pilot signal circuit | Refer to Control Pilot Signal Circuit | |
| Plug-in Charging Time is Too Long | Plug-in charging time is too long | Refer to Plug-in Charging Time is Too Long |
| Hybrid battery temperature sensor | Refer to COMPONENTS | |
| Charging Indicator Does not Illuminate | Indicator lamp assembly | Refer to INSPECTION |
| Charging indicator circuit | Refer to Charging Indicator Circuit | |
| Charging Indicator Does not Turn off | Indicator lamp assembly | Refer to INSPECTION |
| Charging indicator circuit | Refer to Charging Indicator Circuit | |
| Charging Timer cannot be Set | Charging timer switch circuit | Refer to Charging Timer Switch Circuit |
| Charging timer indicator lamp circuit | Refer to Charging Timer Indicator Circuit | |
| Satellite switch set | Refer to INSPECTION | |
| Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Plugin charge control ECU assembly | Refer to COMPONENTS |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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