[. . . ] â· Consult with your dealer if installation requires drilling of holes or other modifications of the vehicle. [. . . ] This unit can be properly installed either from "Front" (conventional DIN Front-mount) or "Rear" (DIN Rear-mount installation, utilizing threaded screw holes at the sides of unit chassis). Speaker leads White: Front left White/black: Front left Gray: Front right Gray/black: Front right Green: Rear left Green/black: Rear left Violet: Rear right Violet/black: Rear right Perform these connections when using the optional amplifier. ISO connector Note In some vehicles, the ISO connector may be divided into two. Yellow/black If you use an equipment with Mute function, wire this lead to the Audio Mute lead on that equipment. [. . . ] Speaker leads White: Front left + White/black: Front left * Gray: Front right + Gray/black: Front right * Green: Rear left + Green/black: Rear left * Violet: Rear right + Violet/black: Rear right * 20. [. . . ]