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 TwoFACTORY OEM SERVICE PROCEDURE
Section 119 (Smart Key System (For Entry Function) (Plug-In) (Diagnostic Codes & Symptom Tests))
WARNING: This page is about a different variant/trim than selected.
- SMART KEY SYSTEM (for Entry Function)
- DTC B27A1: Open in Driver Side Electrical Antenna Circuit
- DTC B27A2: Open in Front Passenger Side Electrical Antenna Circuit
- DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit
- DTC B27A6: Open in Rear Floor Electrical Key Oscillator Circuit
- DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit
- DTC B27A8: Open in Outside Luggage Compartment Electrical Key Antenna Circuit
- Symptom Tests
- All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate
- All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate
- Driver Side Door Entry Unlock Function does not Operate
- Front Passenger Side Door Entry Unlock Function does not Operate
- Driver Side Door Entry Lock and Unlock Functions do not Operate
- Front Passenger Side Door Entry Lock and Unlock Functions do not Operate
- Driver Side Door Entry Lock Function does not Operate
- Front Passenger Side Door Entry Lock Function does not Operate
- Room Oscillator does not Recognize Key
- Entry Interior Alarm does not Sound
- Entry Exterior Alarm does not Sound
- Back Door Entry Unlock Function does not Operate
- Back Door Entry Lock and Unlock Functions do not Operate
- Back Door Entry Lock Function does not Operate
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.