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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (LIGHTING SYSTEM (W/ AFS) - DIAGNOSTICS - INTRODUCTION)
2018 Toyota Prius Two Eco
Section 1 (Lighting System (W/ AFS) - Diagnostics - Introduction)
2018 Toyota Prius Two EcoSECTION Section 1 (Lighting System (W/ AFS) - Diagnostics - Introduction)
WARNING: This page is about a different car, the 2022 Toyota Prius, 2021 Toyota Prius, 2020 Toyota Prius, and 2019 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
- LIGHTING SYSTEM (w/ AFS)
- Precaution [12/2018 - 07/2020]
- Precaution [07/2020 -]
- Parts Location [12/2018 -]
- System Diagram [12/2018 - 06/2021]
- System Diagram [06/2021 -]
- System Description [12/2018 - 06/2021]
- System Description [06/2021 -]
- How To Proceed With Troubleshooting [12/2018 - 07/2020]
- How To Proceed With Troubleshooting [07/2020 -]
- Operation Check [12/2018 - 06/2021]
- Operation Check [06/2021 -]
- Customize Parameters [12/2018 - 08/2019]
- Customize Parameters [08/2019 -]
- Initialization [12/2018 -]
- Problem Symptoms Table [12/2018 -]
- Terminals Of Ecu [12/2018 -]
- Diagnosis System [12/2018 -]
- DTC Check / Clear [12/2018 - 07/2020]
- DTC Check / Clear [07/2020 -]
- Freeze Frame Data [12/2018 - 07/2020]
- Freeze Frame Data [07/2020 -]
- Fail-Safe Chart [12/2018 -]
- Data List / Active Test [12/2018 - 07/2020]
- Data List / Active Test [07/2020 -]
- Diagnostic Trouble Code Chart [12/2018 - 07/2020]
- Diagnostic Trouble Code Chart [07/2020 -]
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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.