Lexus/Toyota
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Lexus LS430 2004 model has the AFS (Adaptive Front Lighting System). It works when turning the corners and adjust to level with the height control system.

My symptoms were the AFS light would flash all the time independent of the AFS off switch setting. It started as soon as I hit 53K, right after my warranty was expired. It didn’t even matter if the lights were on, the blinking occurred day or night. When head lights were on they tended to point too low so they didn’t light up enough of the road (on low beam). I suppose this is the way they are designed so if the mechanism fails the lights don’t point too high an blind oncoming drivers. The failure mode was the bearing on the sensor arm seized due to water ingress and corrosion. It’s a poorly designed part definitely and it isn't a surprise to me it eventually failed.

It is an expensive repair, around $600 to $750. It is so common in all lexus models that it needs to be covered by the manufacturer. You can see the complaints all over in he lexus forums and can be easily investigated at the dealer repair logs.

I stronly feel the repair should be taken care off by the manufacturer and make the consumers free of the burden of their poorly designed part and its related repair.