Had a strange occurence with my 4wd the other day (have the electronic switch). My daughter's sitter lives up a steep driveway and I engaged the 4hi since it had been snowing. No problems except that to turn around in her driveway it's necessary to back up an incline and while turning fairly sharply to the left. As I did so with the 4hi engaged, I heard a clicking and noticed the indicator light going off and on. Once I stopped and started back down the hill, there was no problem with the system. Haven't ever had any problems with the system engaging or dis-engaging.

Would this have been caused by trying to turn sharply at the same time I was backing up the incline? Thought something might have been binding under those conditions.