Just changed battery, all of a sudden the 4x4 warning light in dash came up

[bulkwarrior]

Hi, all I just changed the battery of my 2006 X5. I followed a video procedure on youtube and all went smoothly. After I start the car, however, the 4x4 warning light on the dash came up. This has rarely came up before(I don't even remember when it was last on). I shut down the engine and restarted the car, the warning light is still on. It's the 4x4 with a circle around it, at the middle of the dash. Could there be something that I touched inadvertently that cause this problem? Before I changed the battery it was off. Thanks!