[. . . ] This unit is designed to operate on 12 V DC, NEGATIVE ground electrical systems. [. . . ] If you are not sure how to install this unit correctly, have it installed by a qualified technician. Insert the two handles, then pull them as illustrated so that the unit can be removed. When using the optional stay / Lors de l'utilisation du hauban en option When installing the unit without using the sleeve / Lors de l'installation de l'appareil scans utiliser de manchon In a Toyota car for example, first remove the car radio and install the unit in its place. Stay (option) Hauban (en option) Fire wall Cloison Flat type screws (M5 × 8 mm)*2 Vis à tête plate (M5 × 8 mm)*2 Install the unit at an angle of less than 30°. : When installing the unit on the mounting bracket, make sure to use the 8 mm-long screws. *1 When you stand the unit, be careful not to damage the fuse on the rear. If your car is equipped with the ISO connector / Si votre voiture est équippée d'un connecteur ISO You may need to modify the wiring of the supplied power cord as illustrated. From the car body De la carrosserie de la voiture ISO connector Connecteur ISO ISO connector of the supplied power cord Connecteur ISO pour le cordon d'alimentation fourni Y: Yellow Jaune R: Red Rouge Use modified wiring 2 if the unit does not turn on. [. . . ] * Is the rear ground terminal connected to the car's chassis using shorter and thicker cords? [. . . ]