2018 Toyota Prius Lights Problems

Both of your taillamps are collecting moisture inside them, which could potentially cause electrical problems or a fire hazard. This is a known issue affecting other 2018 Prius models that the manufacturer has fixed before. Your vehicle has the same problem but may be at a different severity level.

Your Prius has serious winter performance issues. The LED headlights and taillights ice over in snow, reducing visibility and creating a safety hazard. The windshield wipers can't be replaced with winter-specific blades due to changed fittings, and when you use them, they just smear ice and water across the windshield instead of clearing it. You may need to exit your vehicle in dangerous winter conditions to manually scrape ice off the lights and windows.

Your automatic high beams intermittently fail to brighten during night driving, even though the system initially works as intended. The dash indicator spontaneously turns off and the headlights won't switch to high beam mode when they should. The dealership has confirmed they can reproduce this problem in your vehicle and other Prius models, though Toyota claims this is normal operation.

Your automatic high beams occasionally fail to switch on and stay stuck in low beams for about 2 minutes, or until you turn off the automatic high beam system. This appears to happen when an oncoming vehicle with bright lights passes by, which seems to disable all high beam function temporarily even if you manually toggle the high beam lever. The issue resolves itself after a couple of minutes or when you restart the automatic high beam system, suggesting it may be a software glitch.

Your auto high beam feature randomly turns off and stops working, then comes back on by itself—especially when it's raining. When the auto high beam is off, you have to completely disable the feature before you can manually turn on the high beams. This appears to be a known issue affecting multiple Toyota vehicles. The fix will likely involve updating the headlight control software or replacing the automatic high beam control module.