On my message display, i got a message that said "Service 4WD"... It stayed on constantly for about a week and a half... I checked the fuse and the transfer case oil level, and visually looked over things... The light went off, but now i lost control of my electronic switches on the dash... I need my 4WD sometimes and need to know what's going on...

I have no failure or tightness in the front wheels when turning by hand... It dosen't feel like i'm getting any grinding, etc... I'm not sure how the switch(s) work and/or the actual transfer case... Any help would be great... Thanks, as always...