4 wheel drive sensor on 1994 Jeep Grand Cherokee

When the car is in drive, sometimes the visual monitor will warn of a 4 wheel drive transfer issue. The car has 457,000 miles, and has it's little quirks. Since I cannot find in the Jeep manual the wording for the warning, what should I be looking for to help correct the issue.

Asked by for the 1994 Jeep Grand Cherokee
I see a 4WD transfer case switch and its located at the top of the transfer case, could be any one of these items 1) Corrosion on the connector to the switch (which is located on top of the transfer case). 2) A bad switch. Part cost about $22.00 or 3) A bad console display runs about $240. Try unplugging the switch connector and see if the display clears.