The first thing to do is check your fuses. It may be a very simple fix.
instrument panel or controls?
On a 2002 Mercury Mountaineer : Put your low beam head lights on and pull the headlight selector switch towards you
The first model year of the Mercury Mountaineer sport utility vehicle was 1997 Did you mean 2005 ?
You can view the Mercury Mountaineer owners manuals online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( then select your year , and Mountaineer , etcetera )
In the 2000 Mercury Mountaineer, the tail lights fuse is located in the interior fuse box, which is typically found on the driver's side, near the dashboard. The specific fuse for the tail lights is usually labeled as "Tail Lamps" or "Stop Lamps." You can refer to the diagram on the fuse box cover for exact placement. Always ensure the vehicle is off before checking or replacing any fuses.
a malfunction has been detected ( could be a sensor )
Your dashboard lights suddenly not working is almost always your indication that your taillights are out. If the fuse for your taillights is blown and you replace it, your dash lights should be fine.
To replace the dashboard lights for the ventilation controls on a 2005 vw passat you need its user manual.
I have what looks like a battery light on my dashboard. What does this mean?
remove the dashboard, and u will see the lights behind it
Your brake lights are out too! Replace the fuse.
If you have to hold the headlight switch out to keep the lights on, then the switch itself is bad. The switch should be a fairly easy part to replace.