1997 Rav 4 Power Ect Button Help?

[jcoates748]

Hi, I just purchased a 1997 rav 4 2.0 with 149,000 miles I have a question if anyone could help it was made in japan I live in the states well when i hit the power ect button its above the radio to the very left out of the 3 buttons, a light on the dash saying L. center diff? I've read about the power button and how it shifts at higher rpms and when its pressed thats all it says that the center diff is locked it doesn't chime or power doesnt light up, i havn't drove with the center diff light on for fear it might mess up the 4wd its also a automatic 4x4 any help would be appreciated thanks!!