The 2004 Honda Civic was an extremely popular compact car that came in coupe, sedan and hatchback body styles. It offered practicality, reliability, fuel efficiency and a relatively affordable price. When it comes to in-car entertainment, the 2004 Civic gave buyers several audio options depending on the trim level. Higher trim packages offered upgraded stereos with more features, while the base models had simpler audio systems.
So does the 2004 Honda Civic have an AUX input? The basic answer is that the higher EX and Si models came equipped with stereo head units that included an AUX port, but the lower DX and LX trims did not have an AUX input as a standard feature. However, there are aftermarket options to add an AUX port to models that did not come with one from the factory.
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Stereo Options for the 2004 Civic
Honda offered different stereo systems across the various trims of the 2004 Civic. Here is an overview of the audio equipment options:
DX and LX Models
The base DX and mid-level LX models came standard with a basic AM/FM radio and a single-disc CD player. This simple head unit did not include an AUX input jack. These lower trims were meant to be affordable basic transportation and did not come loaded with many extras. The core stereo provided the essentials, getting AM/FM radio and the ability to play CDs.
EX Model
The EX trim was the upper level model below the performance-focused Si version. The EX came standard with an AM/FM radio and an in-dash 6-disc CD changer, providing more flexibility for music listening. Importantly, this stereo did include an AUX jack, allowing users to connect devices like an iPod or MP3 player to play music through the car’s speaker system. So EX models with the 6-disc changer head unit have an AUX input.
Si Model
The sporty Si came with an AM/FM radio and a 6-disc CD changer similar to the EX model. Honda also equipped the 2004 Si with an AUX jack to grant access to portable music players. So both the EX and Si trims offer AUX capability.
How to Add an AUX Input to Your Civic
If your 2004 Honda Civic didn’t come equipped with an AUX port, here is an overview of how to add this functionality:
Aftermarket Stereo Head Unit
Installing a new aftermarket car stereo is the most involved but most versatile option. Here is the process:
- Purchase a head unit that fits your Civic and has the features you want. Look for an AUX input jack.
- Remove the factory head unit by unscrewing the mounting brackets and disconnecting the wiring harness.
- Connect the new head unit’s wiring harness to the one in your Civic. Consult a wiring diagram for proper matching.
- Mount the new stereo in the dash opening using the included installation kit.
- Program the settings on the new stereo and sync it with your phone if applicable.
- Connect your device to the AUX input and test that audio plays through the system.
This option gives you full control over your stereo upgrade. Just make sure to get an ISO-standard head unit designed to fit the Civic dash openings and wiring system.
AUX Input Adapter
AUX input adapters are simpler, cheaper plug-and-play devices. Here is how to install one:
- Purchase an adapter made to integrate with your Civic’s stereo.
- Remove the factory head unit to access the rear ports and wiring.
- Plug the adapter into an input port on the rear of the factory stereo.
- Run the adapter cable out to the dash or center console where you want the AUX jack mounted.
- Re-install the factory head unit.
- Plug your audio device into the adapter’s AUX jack to test it.
This maintains the original head unit while conveniently adding an AUX port. Adapters tap into the internal wiring of the factory stereo.
FM Transmitter
For a quick wireless solution, you can use an FM transmitter:
- Buy an FM transmitter with a cigarette lighter power adapter.
- Tune your car radio to an unused FM frequency.
- Plug the FM transmitter into your vehicle’s 12V power outlet.
- Connect your device to the transmitter via headphone jack or Bluetooth.
- Start playing audio on your device. It will transmit over FM to your car stereo.
FM transmitters are affordable and very simple to set up, but sound quality may suffer from FM interference.
Cassette Adapter
For older Civics, you can use a cassette adapter to connect your device through the tape deck:
- Obtain an adapter with a 3.5mm headphone plug on one end.
- Insert the adapter into the cassette slot, just like a tape.
- Connect your smartphone, MP3 player or tablet to the headphone plug.
- Hit play on your device. Audio transmits through the deck.
The audio quality depends on the condition of your tape player. But it provides an easy way to get AUX-like capability.
