message center,security light,4x4 light

well once and a while my security light comes on while driving.also my service 4 wheel drive light comes on ,and i have had my replaced my differential fluid. any answers ?

The security light could be the passlock screwing around and the service 4x4 light most likely is the push button switch screwing around. The second is a simple diy fix just do a search on here and you will find a ton of posts about it.