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.
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HOMESERVICE MANUALSTOYOTA2018PRIUS TWO ECOREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSSMART KEY SYSTEM (KEYLESS ENTRY) - SYMPTOM TESTSSMART KEY SYSTEM (FOR ENTRY FUNCTION)ENTRY EXTERIOR ALARM AND ANSWER-BACK BUZZER DO NOT SOUND [11/2015 - ]CAUTION / NOTICE / HINT
2018 Toyota Prius Two Eco
Caution / Notice / Hint
2018 Toyota Prius Two EcoSECTION Caution / Notice / Hint
NOTE:
- The smart key system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
- Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Precaution.
Refer to PRECAUTION [11/2015 - 12/2018] , or refer to PRECAUTION [12/2018 - 07/2020] , or refer to PRECAUTION [07/2020 - ]
- After repair, confirm that no DTCs are output.
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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.