There is a brightness adjustment or it may be broken
how do i remove the dashboard from my 2002 corvette to change the hud display there is a site that may help you www.spdkilz.com
http://forums.corvetteforum.com/c5-tech/2077521-how-to-dash-removal-and-hud-install.html
HUD means Heads Up Display.
HUD, Heads Up Display
HUD or option number UV6 first appeared on 1999 option list
HUD is short for Heads Up Display.
To install a heads-up display (HUD) on a 2004 Buick Rendezvous, you'll first need to purchase a compatible aftermarket HUD unit. Begin by locating a suitable mounting location on the dashboard where the display can be viewed easily without obstructing your view. Follow the manufacturer's instructions to connect the HUD to the vehicle's power supply, often involving connecting to the cigarette lighter or other power sources. Finally, secure the unit in place and test it to ensure it functions correctly while driving.
Heads up display
The compass is part of the HUD display in the Google Earth Flight Simulator. HUD instrument display can be toggled on/off by pressing 'H' key.
It stands for Heads Up Display.
HUD stands for Heads Up Display when you are playing in a match it shows your HUD Name how hurt your character is and if your character can do his/her finish move
Heads Up Display