Welcome to Mercedesshop. i think if you look at the very frontof the shifter assembly, you may see the light socket that holds the illumination bulb. Possibly the wires were removed from the socket for some reason. i'm not sure if these 2 wires are the ones, but it's worth a look. At any rate you should see the socket and can pull it out to replace the bulb, assuming it's wired up. If the 2 wires will plug into the socket, plug them in and see if it'll work.