First time using the 4Lo button and that worked fine for a steep hill. Now it wont pop out in to 4Hi or any other mode. tried neutral, slow speed, reverse...the light blinks for a while and thats it. Has not been on any real off road in life of H2 ... it is a 2003. Thinking relays, solenoids,, fuse...etc. Thanks for any tips!

 

This may be too late but just for everyone's benefit... Check the speed sensors at the wheels. I found out that I had a speed sensor at the right rear that got ripped out during wheeling. I fixed it and was able to switch the 4WD back to 4HI unlock.