[. . . ] If the insulation of the wiring melts or gets torn, there is a danger of the wiring short-circuiting to the vehicle body. Don't pass the yellow lead through a hole into the engine compartment to connect to the battery. This will damage the lead insulation and cause a very dangerous short. [. . . ] Never feed power to other equipment by cutting the insulation of the power supply lead of the unit and tapping into the lead. When replacing fuse, be sure to use only fuse of the rating prescribed on this unit. Since a unique BPTL circuit is employed, never wire so the speaker leads are directly grounded or the left and right speaker leads are common. If the RCA pin jack on the unit will not be used, do not remove the caps attached to the end of the connector. Speakers connected to this unit must be highpower types with minimum rating of 50 W and impedance of 4 to 8 ohms. Connecting speakers with output and/or impedance values other than those noted here may result in the speakers catching fire, emitting smoke, or becoming damaged. When this product's source is switched ON, a control signal is output through the blue/white lead. If installation angle exceeds 30° from horizontal, the unit might not give its optimum performance. Power amp (sold separately) Connecting cords with RCA pin plugs (sold separately) Cap (1*) When not using this terminal, do not remove the cap. Installation using the screw holes on the side of the unit Fastening the unit to the factory radio mounting bracket. System remote control Select a position where the screw holes of the bracket and the screw holes of the head unit become aligned (are fitted), and tighten the screws at 3 or 4 places on each side. Use either binding screws (5 × 8 mm) or flush surface screws (5 × 8 mm), depending on the shape of the screw holes in the bracket. Yellow (2*) To terminal always supplied with power regardless of ignition switch position. Please ground this lead separately from the ground of high-current products such as power amps. [. . . ] Please ground this lead separately from the ground of high-current products such as power amps. If you ground the products together and the ground becomes detached, there is a risk of damage to the products or fire. Cords for this product and those for other products may be different colors even if they have the same function. [. . . ]