The first step in the installation is to locate the Mopar ECU and identify the wires that will be interfaced. Bob Ida can help with this when you order the unit. He can provide a diagram of what wires need to be attached for your vehicle. The ECM on our '01 Durango resided under the hood on the passenger-side fenderwell. Ida did such a nice job of connecting into the Chrysler harness that it looked stock when done.