What does the orange triangle light mean on the instrument panel of a 2003 VW Passat?

SOURCE: VW Passat 2003 Brake Lights

Good day;
In your trunk area there should be a piece of carpet by your tail light just move that to the side and then you can access your bulb. Any problems please let me know.

Cheers

SOURCE: 99 vw passat won't always start

That would be your Ignition switch my friend, happens to most the vw's within their 200k mile life span. if you turn the key and it doesn't start, try (as you have the key engaged to start the engine) lightly leaning the key up, down, left, right, sideways, which ever way possible, or even pushing the key its self into the ignition as far as it will go, if its the ignition switch, the car will most likely start. Now, for saftey reasons i will tell you not to drive the car once you do get it started, for the only problem i had with doing that was as i was driving down the road, the started engaged when ever i would push the clutch in, so i had to resort to "speed shifting", and something like that could lead to an accident. if you bring it to a local repair shop it shouldnt cost you more the $100 to fix.

SOURCE: Interior trim panel removal instruction

Normal 0 . Disconnect your negative battery cable. Locate and remove the screws that hold your interior door handles in place (they may be hidden by snap in, or snap on clips). Remove the interior door handles, then disconnect the wire clips to the switches. Your panel is held in place by snap in clips; use a small pry bar to pull them from the door (try to get as close to, or directly under the clips to prevent them from tearing out of the door panel). Once the clips are pulled, pull the panel upward to remove it from the door.
Install in reverse.

If you don't have power windows you will have to remove the manual window crank. It is held in place by a clip on the back side of the base. To remove the clip, you will need a small hook (kind of like a knitting needle). Put the hook in behind the base, and grab the clip and pull it off. To replace it, slide the clip back on the window crank, and snap it back on the door.

SOURCE: my 2002 vw passat wont start when i turn the key

Bad fuel pump.

SOURCE: Warning light

I believe it has to do with your traction control sensors and that one of the sensors may be faulty