Toyota Prius C high beams not working and front lights dimmer on Toyota Prius C

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Toyota Prius C owners report experiencing issues with their high beams not functioning and front lights appearing dimmer than usual. These problems may stem from a malfunctioning dimmer switch, which can be assessed by bypassing a specific connection to determine if it is the source of the issue. Additionally, some owners find that checking the dimmer relay, located in front of the large fuse box on the driver's side, is crucial, as a loose or faulty relay can contribute to lighting problems. Ensuring that the fuses related to the high beams are intact and verifying the amperage at the socket and relay are also important steps in troubleshooting potential power supply issues. Furthermore, some owners discover that burned-out bulbs can be identified using a test light on the high beam wire, indicating another possible cause for the malfunction. It is recommended that owners consult the Toyota Prius C owner's manual and repair manual for specific guidance on checking the high beam headlight circuit and related components to address these concerns effectively.

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