auto headlight response too slow
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3rd Gear
Joined: Jun 2025
Posts: 3
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auto headlight response too slow
Hi everyone. I just bought a 23 is350. It is my first time owning a Lexus. Comparing to my previous cars, its headlight response time is way slower. If I block the sensor with my hand, the brightness of screen drops instantly but the it takes about 10 seconds for the headlight and indoor ambient light to turn on. Everytime I drive into a covered parking lot or tunnel I have to turn light on manually myself.
I am wondering is there a way to adjust its response time ? I am sure this is not a sensitive issue. Is this normal for Lexus?
I am wondering is there a way to adjust its response time ? I am sure this is not a sensitive issue. Is this normal for Lexus?
Moderator
Joined: Nov 2016
Posts: 9,612
Likes: 4,801
From: GA
Hi everyone. I just bought a 23 is350. It is my first time owning a Lexus. Comparing to my previous cars, its headlight response time is way slower. If I block the sensor with my hand, the brightness of screen drops instantly but the it takes about 10 seconds for the headlight and indoor ambient light to turn on. Everytime I drive into a covered parking lot or tunnel I have to turn light on manually myself.
I am wondering is there a way to adjust its response time ? I am sure this is not a sensitive issue. Is this normal for Lexus?
I am wondering is there a way to adjust its response time ? I am sure this is not a sensitive issue. Is this normal for Lexus?
Driver
Joined: May 2023
Posts: 83
Likes: 69
From: California
I just also learned about the setting to stop the "Eco" light from showing up on the gauge cluster.
Thread Starter
3rd Gear
Joined: Jun 2025
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Last edited by Lebaozzn; Jun 3, 2025 at 06:31 PM.
Moderator
Joined: Nov 2016
Posts: 9,612
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From: GA
I would say that my car takes around 5 seconds to turn on the headlights when I go into a tunnel or dark overpass or something like that - perhaps a bit less if it's a particularly shady parking garage. Either way, 3-5 seconds. Is that about right for you as well? I've owned 3 ISes, and all have been the same in this regard.
Rookie
Joined: Dec 2023
Posts: 27
Likes: 7
From: NJ
I have the same annoyance, OP. The headlight sensitivity setting has no effect on how long it actually takes for the headlights to come on. There's a fixed timer that is independent of the light sensitivity.
Even worse, the headlights do not come on automatically when its raining and the windshield wipers are on. This weekend, I had to turn on the headlights manually because rain caused some very low visibility on the highway, and the ambient light during the daytime was preventing the headlights from coming on.
Even worse, the headlights do not come on automatically when its raining and the windshield wipers are on. This weekend, I had to turn on the headlights manually because rain caused some very low visibility on the highway, and the ambient light during the daytime was preventing the headlights from coming on.
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