The 2018 WRX head unit wiring diagram is an essential component for anyone who wants to install a new stereo. The head unit, also known as a car stereo or radio, is the centerpiece of a vehicle’s audio system. It’s responsible for receiving AM/FM radio signals, playing CDs, and streaming music through Bluetooth or USB connections.
If you’re looking to upgrade your sound system, then knowing how to read a wiring diagram is crucial. In this article, we’ll walk you through the steps to decode the 2018 WRX head unit wiring diagram and help you connect your new stereo seamlessly.
Understanding the Basics of the 2018 WRX Head Unit Wiring Diagram
Before we dive deep into the wiring diagram, it’s important to understand the basics of electrical systems in vehicles. There are three major components in a car’s electrical system- the battery, the alternator, and the starter. When the ignition is turned on, the battery provides the initial power needed to start the engine, and the alternator takes over to keep the battery charged and supply power to the rest of the vehicle.
Now, let’s discuss the components of the head unit wiring diagram. The diagram outlines everything from the head unit to the speakers and amplifiers. It shows the color-coded wires and connectors used to connect these parts. You’ll notice that each wire has a purpose, such as powering the radio, ground, or speaker output.
The 2018 WRX Head Unit Wiring Diagram Components
- Radio Antenna: The antenna is responsible for receiving AM/FM signals and sending them to the head unit. It’s usually mounted on the exterior of the vehicle.
- Power Cables: These cables provide the head unit with power from the battery. You’ll find the ground wire, ignition wire, and battery wire in this section.
- Stereo Harness: This harness connects the head unit to the vehicle’s wiring system. It contains the power, ground, and speaker wires required for the connection.
- Speaker Wires: These wires connect the speaker output from the head unit to each individual speaker in the car. Each wire is color-coded to help with identification.
- Amplifier Wires: If you’re installing an amplifier, then you’ll need to connect it to the head unit using these wires.
Decoding the 2018 WRX Head Unit Wiring Diagram
Now that you understand the components let’s decode the wiring diagram step by step.
Step 1: Identify the Power Cables
The power cables are usually located on the right side of the wiring diagram. Look for the red wire labeled “+12V Battery” and the black wire labeled “Ground.” The yellow wire labeled “+12V Ignition” connects to the ignition switch and is used to turn the radio on and off.
Step 2: Locate the Stereo Harness
The stereo harness should be located near the head unit. You’ll notice that the stereo harness is divided into three sections- power, ground, and speakers. The power section should have a red, yellow, and black wire. The speaker section will have eight wires, two for each speaker in the car. Check your head unit manual to match these wires with the appropriate speaker output.
Step 3: Connect the Speaker Wires
The speaker wires should be color-coded and match the wires in the car’s speaker harness. Typically, the positive wire will be a solid color, while the negative wire will be striped. Connect these wires to the corresponding wires on the car’s harness using a crimp connector or soldering. Repeat this process for each speaker in the car.
Step 4: Install Amplifier Wires (If Applicable)
If you’re installing an amplifier, then you can connect it to the head unit using the amplifier wires. The diagram will show you where to connect the RCA cables and remote wire. You’ll also need to connect the amplifier’s power and ground wires to the car’s battery and chassis.
FAQ About the 2018 WRX Head Unit Wiring Diagram
Q. What is the function of the head unit in a car’s audio system?
A. The head unit is responsible for receiving AM/FM radio signals, playing CDs, and streaming music through Bluetooth or USB connections, making it the centerpiece of a vehicle’s audio system.
Q. Why is it important to read a head unit wiring diagram?
A. Knowing how to read a head unit wiring diagram is essential if you want to install a new stereo or upgrade your vehicle’s audio system. The diagram provides a visual representation of how the wiring is connected and helps you avoid common mistakes.
Q. What should I do if I can’t find my head unit’s wiring diagram?
A. You can usually find head unit wiring diagrams online or check the manufacturer’s website. If you’re still having trouble, seek help from a professional installer.
Q. Can I use my old stereo harness with a new head unit?
A. In most cases, you’ll need to use a new stereo harness that’s compatible with your new head unit. However, some vehicles may have universal harnesses that will work with multiple head units.
Conclusion
Understanding the 2018 WRX head unit wiring diagram is crucial if you want to upgrade your vehicle’s audio system. The diagram provides a visual guide to connecting the head unit, speaker wires, and amplifier wires. Always make sure to follow the instructions carefully and seek help from a professional installer if you’re unsure.
With this guide, you’ll be able to connect your new stereo seamlessly and enjoy high-quality audio in your car.
