sterio

hi how do you unlock a 2001 grand cherokee sterio please

When you say "locked" do you mean all the controls stopped working because the battery was disconnected? If that's the case there's usually a code to enter for unlocking it. If you don't see the instructions in the owner's manual (and a code probably written on the original papers that came with the vehicle), call a local Jeep dealer, provide the VIN # and they should be able to look it up for you.