HUD Issue?
Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,616
Likes: 1,055
From: Compound in the Grove, Ga.
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St. Jude Donor '16
HUD Issue?
For the past few weeks I have been noticing my HUD display will get dim than bright as I drive along. This only happens during daylight driving, everything works fine at night.
I looked up how it operates in the service Manuel and it is supposed to have a light sensor. Does anyone know if this is part of the HUD unit? I know about the one on the dash above the DIC buttons and it only dims the dash lighting. The other one on the dash top is for the auto lights on, both of these work fine and have no effect on the HUD.
I have tired using a very bright flashlight around the HUD unit to see if it would have any effect on the brightness but it does not, only happen while driving. I also tried varying RPM’s no effect.
Thanks Steve
I looked up how it operates in the service Manuel and it is supposed to have a light sensor. Does anyone know if this is part of the HUD unit? I know about the one on the dash above the DIC buttons and it only dims the dash lighting. The other one on the dash top is for the auto lights on, both of these work fine and have no effect on the HUD.
I have tired using a very bright flashlight around the HUD unit to see if it would have any effect on the brightness but it does not, only happen while driving. I also tried varying RPM’s no effect.
Thanks Steve
Melting Slicks
Joined: Jun 2001
Posts: 3,123
Likes: 3
From: Orland Park Illinois
St. Jude Donor '06-'07
Two things will cause this problem.
1. Polarized sun glasses and
2. The sun light hitting your windshield at various angles
As far as I know, there is no auto dimming feature on the HUD. But, maybe I'm wrong?????? If I am, hopefully someone else will chime in......Good luck....
1. Polarized sun glasses and
2. The sun light hitting your windshield at various angles
As far as I know, there is no auto dimming feature on the HUD. But, maybe I'm wrong?????? If I am, hopefully someone else will chime in......Good luck....
Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,616
Likes: 1,055
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
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St. Jude Donor '16
Originally Posted by BiggieBoy
Two things will cause this problem.
1. Polarized sun glasses and
2. The sun light hitting your windshield at various angles
As far as I know, there is no auto dimming feature on the HUD. But, maybe I'm wrong?????? If I am, hopefully someone else will chime in......Good luck....
1. Polarized sun glasses and
2. The sun light hitting your windshield at various angles
As far as I know, there is no auto dimming feature on the HUD. But, maybe I'm wrong?????? If I am, hopefully someone else will chime in......Good luck....
Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,616
Likes: 1,055
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
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St. Jude Donor '16
ttt 
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
My Bonneville w/ HUD does this sometimes as the headlights go on/off automatically. There are times when it can;t figure out if it On or Off (dusk/dawn/real cloudy days) and the light go On/Off/On.... The HUD dims w/ the lights on, bright when theie off.
Burning Brakes
Joined: Jun 2005
Posts: 1,171
Likes: 0
From: TN
Cruise-In VII Veteran
Originally Posted by We Gone
For the past few weeks I have been noticing my HUD display will get dim than bright as I drive along. This only happens during daylight driving, everything works fine at night.
I looked up how it operates in the service Manuel and it is supposed to have a light sensor. Does anyone know if this is part of the HUD unit? I know about the one on the dash above the DIC buttons and it only dims the dash lighting. The other one on the dash top is for the auto lights on, both of these work fine and have no effect on the HUD.
I have tired using a very bright flashlight around the HUD unit to see if it would have any effect on the brightness but it does not, only happen while driving. I also tried varying RPM’s no effect.
Thanks Steve
I looked up how it operates in the service Manuel and it is supposed to have a light sensor. Does anyone know if this is part of the HUD unit? I know about the one on the dash above the DIC buttons and it only dims the dash lighting. The other one on the dash top is for the auto lights on, both of these work fine and have no effect on the HUD.
I have tired using a very bright flashlight around the HUD unit to see if it would have any effect on the brightness but it does not, only happen while driving. I also tried varying RPM’s no effect.
Thanks Steve
Pro
Joined: Nov 2003
Posts: 598
Likes: 1
From: Vinton VA
I've noticed that the hud on my '01 vert is brighter than the one on my '04 coupe, about 25% brighter. Took it to the dealer and they claim it's OK. I just can't understand why the '01 has a brighter display.
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Thread Starter
Race Director
Joined: Feb 2002
Posts: 11,616
Likes: 1,055
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
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St. Jude Donor '16
Thanks for the replys
At this point I guess I'll just wait and see if it gets worse or goes out completely..was thinking if I could find where the light sensor is I would try and change it.
diyguy...Mine is the same only gets dim on dark roads also than brite again.
I did push it up to 3 digits the other day and the (1) was brighter than the two (00)
At this point I guess I'll just wait and see if it gets worse or goes out completely..was thinking if I could find where the light sensor is I would try and change it.
diyguy...Mine is the same only gets dim on dark roads also than brite again.
I did push it up to 3 digits the other day and the (1) was brighter than the two (00)
Pro
Joined: Dec 2004
Posts: 706
Likes: 0
From: Orlando FL
Ive taken the speedo out a few times and never had this problem. Im thinking its in the HUD itself but untill i take the dash out again who knows. Seems this is a HUD problem after a few years of service but what else is new 
Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
I dont know where the sensor is, but here is some info from the rarely read owners manual.
The brightness of the HUD image is determined by
the light conditions in the direction your vehicle is
facing and where you have the HUD dimmer control
set. If you are facing a dark object or a heavily
shaded area, your HUD may anticipate that you are
entering a dark area and may begin to dim.
It is possible for sunlight to enter the HUD causing
all of the graphics to light up. The display will return
to normal when the sunlight is no longer entering
the HUD.
The brightness of the HUD image is determined by
the light conditions in the direction your vehicle is
facing and where you have the HUD dimmer control
set. If you are facing a dark object or a heavily
shaded area, your HUD may anticipate that you are
entering a dark area and may begin to dim.
It is possible for sunlight to enter the HUD causing
all of the graphics to light up. The display will return
to normal when the sunlight is no longer entering
the HUD.