LFA Rain-Light Sensor Issue

I'm at my wit's end! I've got a 2012 Lexus LFA with a gasoline engine, and recently, the rain-light sensor seems to have gone bonkers. Mileage is at 112600 km. The error memory keeps storing a fault, the automatic wipers refuse to wipe automatically in the rain, the headlights won't switch on automatically, and even the speedometer dimming is off! To top it off, the lights are constantly switching on. Anyone else experienced this madness? Is my LFA haunted?

4 comment(s)

Whoa, that sounds eerily familiar! I've got an LFA too, and I had similar issues a while back. No automatic wiping, lights acting up... Did you notice any bubbles forming under the gel pad of the windshield where the sensor sits?

Bubbles, you say? I haven't specifically looked for that... where exactly should I be peering? And if I do spot those pesky bubbles, what does that even MEAN? Am I doomed to manually control my wipers forever?

Check right around where the sensor is mounted on the inside of the windshield. If you see bubbles, that's likely the culprit. The gel pad degrades over time. I’d suggest getting it checked by a workshop, it's a fairly common problem, apparently.

Incredible! I checked, and you're spot on – tiny bubbles everywhere under that gel pad. Took it to my local Lexus shop, and they knew exactly what was up. 62€ later, new gel pad, recalibrated sensor, and everything's working perfectly again. Thanks a million for pointing me in the right direction!

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