Rodeo 4wd Indicator Light

[scottaa]

Hello. .
I'm NOT a mechanic and I live in a foreign country where nobody has computer diagnostics here for my Isuzu Rodeo 2004. The vehicle has 5,000 miles on it. Previously, the 4WD would work fine. At some point, the 4WD would not turn off when I turned the 4WD switch off. The only way to turn off the 4wd would be to stop the vehicle, turn off the engine, and then turn off the 4WD switch. This worked for a while. Then, I turned the engine off 1 day, turned off the 4WD switch, and the Check 4WD Indicator Light lit up. The indicator light has been on for many months now, and the 4WD won't turn on at all now. Any ideas of what is wrong? What is the fix? Thanks so much!