Originally Posted by thefonz
1990 is fairly old. In some of the earlier models, the 5 digit code was on the lift arm in the trunk.
Hi, this is correct; there is a small sticker or decal that has the keyless entry code on it, located in the trunk. The Explorers have the code on the module in the left 1/4 panel area. Remove the little panel inside and you can see the box. The numbers are hard to see and read. [little sticker or decal]