Remove the cover around the controls and you will see the bulbs inside the climate control unit. It just pulls off.
To replace the dashboard lights for the ventilation controls on a 2005 vw passat you need its user manual.
These and steering airbags need to be professionally installed by a machanic or dealership.
How do you reset dashboard brake light on vw passat
can you buy a spring for dashboard drawer 2007 passat
yes
How do I replace a turbo in 2003 vw passat
low brake fluid
HI, how program the new remote control for passat vw
http://www.tobio.info/passat/howtos/passat_air_filter.html
How do you replace the side mirror turn signal bulb on a 2008 Passat?
Button A on a Volkswagen Passat can refer to different controls depending on the model year and trim level. Typically, it could be located on the dashboard, center console, or on the steering wheel, depending on its function (e.g., climate control, audio settings, or navigation). For precise identification, it's best to consult the owner's manual specific to your Passat model.
http://www.fishh2o.com/Misc/Misc/Passat%20Radiator.html