[. . . ] To prevent a short circuit, do not remove the caps on the ends of the unconnected wires or the terminals. If the console has a lid, make sure to install the unit so that the faceplate will not hit the lid when closing and opening. If the fuse blows, first make sure the wires aren't touching to cause a short circuit, then replace the old fuse with one with the same rating. The unit may be damaged or fail to work if you share the - wires or ground them to any metal part in the car. [. . . ] The unit may be damaged or fail to work if you share the - wires or ground them to any metal part in the car. After the unit is installed, check whether the brake lamps, blinkers, wipers, etc. Do not mount the unit in a place where the cooling fan of the unit are blocked. Do not press hard on the panel surface when installing the unit to the vehicle. Reception may drop if there are metal objects near the Bluetooth antenna. If you connect the ignition wire (red) and the battery wire (yellow) to the car chassis (ground), you may cause a short circuit, that in turn may start a fire. Always connect those wires to the power source running through the fuse box. The first time you turn on the DNX521VBT/DNX5220, you must wait while the system acquires satellite signals for the first time. Make sure your vehicle is outdoors in an open area away from tall buildings and trees for fastest acquisition. After the system acquires satellites for the first time, it will acquire satellites quickly each time thereafter. For that reason, always make sure to turn off the unit's power when the ignition is turned off. to link the unit's power to the ignition , connect the ignition cable (ACC. Red) to a power source that can be turned on and off with the ignition key. It should be installed as horizontally as possible to allow easy reception of the GPS satellite signals. Peel the backing off of the adhesive on the bottom of the metal plate (Accessory 4). Press the metal plate (Accessory 4) down firmly on your dashboard or other mounting surface. Wire the microphone cable up to the hands-free box with it secured at several positions using tape or the like. Depending on the type of car, reception of the GPS satellite signals might not be possible with an inside installation. The GPS antenna should be installed at a position that is spaced at least 12 inch (30 cm) from cellular phone or other transmitting antennas. Signals from the GPS satellite may be interfered with by these types of communication. [. . . ] Depending on the type of car, reception of the GPS satellite signals might not be possible with an inside installation. The GPS antenna should be installed at a position that is spaced at least 12 inch (30 cm) from cellular phone or other transmitting antennas. Signals from the GPS satellite may be interfered with by these types of communication. Painting the GPS antenna with (metallic) paint may cause a drop in performance. [. . . ]