Opel Frontera Free Workshop and Repair Manuals Opel Frontera Opel Frontera is a rebadged version of the Isuzu MU Wizard acronym "MU" is short for "Mysterious Utility". Isuzu manufactured several variations to the MU and its derivates for sale in other countries. It was originally built in 1989. Frontera is a long wheel base, five-door vehicle. OPEL Car Radio Stereo Audio Wiring Diagram Autoradio OPEL Car Radio Stereo Audio Wiring Diagram Autoradio connector wire installation schematic schema esquema de conexiones stecker konektor connecteur cable shema car stereo harness wire speaker pinout connectors power how to install. OPEL Car radio wiring diagrams. Car radio wire diagram stereo wiring diagram gm radio wiring diagram.