Summarize the following:
Every head unit, center console, and removal process is different depending on your vehicle’s make and model. Consult your instruction manual to see how you’re supposed to disassemble your dashboard to access your factory head unit. Typically, you’ll use prying tools to pop the covers off after unscrewing the knobs and screws on your center console. Once your factory head unit is exposed, slide it out or unscrew it before pressing the release clip to pop the wire harness off.  The head unit refers to the box where your radio dials and volume controls are. The wire harness is the small set of slots that bring all of your individual wires into the right slots on your head unit. Set any knobs or screws aside in a safe place so that you don’t lose them when it comes time to rebuild your dashboard. You usually start on the bottom of the dashboard where your cup holders or stick shift are. Depending on your audio system, you will either be connecting a new head unit to the old wire harness or attaching a new wire harness to your preexisting wire harness. Either slide your new head unit directly into the wire harness while matching the corresponding colors together or use wire strippers to expose the wires on each corresponding pair and twist the exposed part to tighten it. Slide each set of exposed wires into a butt connector and use a crimp tool to set the wire in place.  This process depends entirely on your vehicle’s make and model as well as your audio wiring kit’s instructions. Use a zip tie to tighten bundles of cords together and make things easier. Cap any exposed wires with small pig tails by trimming them with wire cutters. Twist the pig tail on top of the exposed wire until it catches. A subwoofer and an amp run on a different voltage than your speakers and head unit. To compensate, connect a line out converter to your head unit by connecting the right channel and left channel in the line converter to the right channel and the left channel in the head unit with RCA cables. Connect the other cables as stated in your instruction manual for the audio system.  Some single-din head units come with a slot for a line converter directly underneath it. You probably need to use RCA cables to connect the head unit to the line out converter. You may need to plug a cable into the output port on the head unit and run it into the input port on the line out converter. Your line out converter comes with a blue connection cable. This cable relays information from your line out converter to your amplifier. Run the cable to your amp by either hiding it under your floor mats or running it under the plastic panels between the doors and seats on the driver’s side.  Hide the cable under the cases between the doors and seats or simply slide it under the floor mats. Leave the blue cord next to the red power cord.

Summary:
Disassemble your center console to remove the factory head unit. Match the colors for each wire together on the new head unit. Connect your line out converter to the head unit. Run the blue cable to the amp on the opposite side of the vehicle.