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I have HID and when I switch them to high beam I hear a loud click outside the car. Anyone else have this? You can really hear it when you turn the radio off.
 

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Boltbacker said:
I have HID and when I switch them to high beam I hear a loud click outside the car. Anyone else have this? You can really hear it when you turn the radio off.
Yes. I too have heard it. I believe it only applies to the HID lights. Regular headlights operate on the principal of two different bulbs. One bulb is “regular” intensity; the other is “high” intensity. When you drive without your high-beams the regular intensity bulb is lit and the high intensity is not. When you switch on your high-beams the regular intensity bulb is turned off and the high intensity bulb it turned on.

The HID lights in the Acadia do not work that way. There is only one bulb and one intensity. It does not matter if your high-beams are on or not, the bulb is always on at the same intensity. Instead there is a mechanical device that lowers a shield over the top front of the headlight preventing the light from shinning above ~4 feet. When your high-beams are off, the shield is covering part of the bulb which prevents it from going higher than ~4 feet (this places it just below the rearview mirror of the car in front of you). When you turn your high-beams on, the shield is removed and the light is allowed to scatter much higher, giving you increased visibility.

The best way to imagine it is to turn on a flashlight and shine it at the wall. You will notice a circle of light on the wall. Now cover the top half of the light with your hand. You’ll now see a semi-circle on the wall. Full light is with high-beams on, semi circle is with the high-beams off.

The noise you hear is the mechanical shield shifting back and forth over the path of the light. THE NOISE IS NORMAL.
Park in front of your house at night and turn on the high-beams. You’ll notice the light probably hits the second story windows. Now turn off the high-beams and you’ll clearly see that the top half is covered and light only makes it to the first story windows. But in both situations, the intensity of the light has not changed.
 

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Discussion Starter #4
Ok, sounds good, I wonder why I never heard it on my Cadillac?
 

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Boltbacker said:
Ok, sounds good, I wonder why I never heard it on my Cadillac?
Perhaps your Caddy has a setup like my '98 A8- HIDs are low beam only, with traditional halogen high beams. The system on the Lambdas sounds like a true "bi-xenon" setup (newer Audis have this kind, IIRC). The reason for the "shutter" instead of just turning on a second bulb, is that the HID lights have to warm up when you turn them on. It only takes 1-2 sec, but that's unacceptable when you're cruising down the road.
 

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I just purchased a 2019 SLT and noticed the same thing. I videoed the sound from my driver side door and it's loud. My brother said it was the same thing about the shield, etc. I've never noticed this before on my old Honda. If it's normal then good. I will hardly ever use the high beams anyway.
 

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I have HID and when I switch them to high beam I hear a loud click outside the car. Anyone else have this? You can really hear it when you turn the radio off.
Hello,I have the 2019 ALL TERRAIN and this didn't start till after 10,000 miles.Its BS,THEY DIDN'T PUT THESE LIGHTS IN and then say sorry thats how it is. I went to the local dealer and they lied about calling GMC, who cares its under warranty fix it ,is this happening to all the other GMC and Chevy vehicles? Last GMC 4 Me.
 

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Well, we have another baby whining about his/her vehicle. Or maybe just a troll.

George
I'm still wondering how they hear a loud noise outside the vehicle when switching on the high beams. Who turns on the high beams from outside the vehicle?
 

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Hello,I have the 2019 ALL TERRAIN and this didn't start till after 10,000 miles.Its BS,THEY DIDN'T PUT THESE LIGHTS IN and then say sorry thats how it is. I went to the local dealer and they lied about calling GMC, who cares its under warranty fix it ,is this happening to all the other GMC and Chevy vehicles? Last GMC 4 Me.
Hello I just Replaced my Hologen bulbs with HIDs 9012 same as factory Hologen bulbs I never heard the sound until after I installed the HIDs I will tell you they are much Brighter than the Hologen bulbs but I want to know if that shutter is hitting the NEW HIDS AND IT DOES SOUND LIKE A SHUTTER OPENING AND CLOSING
 

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Loud? If it's really loud.. . something may be afoot with a problem in the projector beam high beam shutter.
Being a single 9012 bulb system, high beam is obtained by flipping a shutter to expose the full bulb lighting pattern rather then a Low Beam cut off.
 

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The Projector Beam Headlights have a metal ACTIVE SHITER BUILT IN THEM.I TOO NOTICED THE NOISE WHEN I SWITCHED MINE TO HIDs WHAT A DIFFERENCE SUPER BRIGHT ALSO WENT WITH LEDs for the Fogs I don't even need the High Beams it's Great especially up here in the Adirondacks it's deer season year-round all kinds of creatures running out in the road with this light setup can even see the ditch line and off to the sides for quite a bit definitely well worth it especially safety concerns the other day luckily I had the new bulbs in because there were two kids walking with all black on right out about 4 ft from the shoulder in the middle of the road with a 45 mile-an-hour speed limit pick them up about quarter of a mile away with new lights definitely well worth it good luck stay healthy ride safe any questions give a holler
 
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