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2002-2004 Nissan Altima

Upgrading the stereo system in your Altima
2002 • 2003 • 2004

2002-2004 Nissan Altima

In brief: This Crutchfield Research Garage article gives you an overview of your Altima's stock stereo system and your aftermarket upgrade options. Use our vehicle selector to find the gear that will fit your Nissan. 

Overview of the Nissan Altima

 Mid-sized family sedans are expected to be roomy, practical, safe…and that’s about all, really. It’s a hotly contested segment filled with relatively bland cars. When Nissan designed the third-generation Altima, they already knew that anything with four doors and a place to tie down a child seat would sell like hotcakes. But they designed something interesting anyway. The result was a car that was roomy, practical, safe, and – surprise, surprise – fun to drive.

We’re not just talking about the 3.5 liter V6 model, either. Automotive magazines of the day also raved about the performance and handling of the 2.5 liter 4-cylinder Altima—and magazine writers almost never rave about the base model of anything. Spirited performance, a comfortable interior, and sleek styling (that’s aging quite well, we think), make this Altima a terrific choice for anyone looking for a mid-size sedan with a little something extra.

Detailed stereo and speaker removal instructions

MasterSheet image
With step-by-step disassembly instructions and plenty of up-close, detailed photos, our exclusive Crutchfield MasterSheet™ takes the guesswork out of removing the factory stereo and speakers. It's free with your Crutchfield order, or you can purchase one separately for just $9.99.

Factory stereo system

The 2002-04 Altima was available with a choice of two factory stereo packages; a standard 6-speaker AM/FM/CD system or a premium 8-speaker Bose® AM/FM/CD system. One of the few complaints we came across while reading old road tests involved the car’s somewhat noisy interior. One writer suggested turning up the stereo, which isn’t such a bad idea. We’d simply suggest that you install a better stereo first!

2002-2004 Nissan Altima radio

The Altima's factory radio (Crutchfield Research Photo)

Replacing your factory radio

Removing the factory system is relatively uncomplicated, though you’d be wise to be very careful with the plastic bits. Despite the Altima’s general wonderfulness, some reviewers noted the "brittle" plastics used in the interior. Your opinions may vary, but any time you see that word used in relation to a dashboard you’re about to pry apart, it’s probably wise to work slowly.

First, you’ll pull the climate control trim panel straight out to release two metal retaining clips, disconnect the wiring harness, and remove. You’ll need to remove one Phillips screw located at lower right corner of receiver trim panel, then pry the panel out from bottom and pull it away from windshield to remove. From there, you’ll remove the four Phillips screws securing the radio, pull it out, disconnect everything, and remove it. Hang onto those four screws, by the way. You’ll need them to secure your new mounting bracket to the dash.

The factory stereo cavity measures 8-1/4" deep x 6-11/32" high x 7-13/16" wide, so you have plenty of room for a new receiver. The Altima’s football-shaped dash cavity might seem like a fit challenge, but dash kits are available for both 2" DIN or 4" double-DIN receivers. The kits fit your receiver and the dash opening perfectly, so the installation will look great. The kit is available at a deep discount with all Crutchfield stereo orders, along with a wiring harness. Our famous Crutchfield MasterSheet™ is included for free.

From here, simply follow the instructions to install your new receiver, test it out, then work backwards to put everything back together.

Replacing the radio on Bose® equipped models (You’ll see the Bose logo on the stereo's cassette door and the rear deck speaker grilles.) is no different, but you will need an adapter to match your new receiver to the Bose system’s factory amp. This non-electronic adapter is available at a very nice discount..

Of course, if you have the Bose radio, you might not want to replace it. We understand completely. You can still upgrade the speakers without replacing the radio. You can also purchase several adapters that allow you to use Bluetooth, obtain Sirius/XM satellite radio access (with subscription) and play music from your iPod® or MP3 player.

Tools needed: Phillips screwdriver, panel tool

Steering wheel audio controls

It's relatively easy to retain your Altima's steering wheel audio controls when you install a new stereo in your Altima. When you enter your vehicle information, our database will choose the adapter you need to make your factory steering wheel controls work with your new receiver.

Shop for car stereos that fit your Nissan Altima

Replacing your factory speakers

nissan altima front door

The Nissan Altima's front door. (Crutchfield Research Photo)

Front speakers

Depending on your speaker needs, replacing the front speakers on an Altima with the base stereo can be moderately challenging or somewhat involved. Replacing the factory 5-1/4" speakers with aftermarket units is no problem at all, but going bigger means a lot more work.

The difference can be traced to the 4.673" cutout diameter in the steel door frame. If you want to install anything larger than a 5-1/4" speaker, you’ll need to cut away at the door steel. Cutting through steel is not the easiest thing for the average amateur installer, so if you insist on 6-1/2" speakers, we suggest retaining the services of a car audio installation professional.

The door panels have to be removed to access the speakers, of course, and your Crutchfield MasterSheet contains step-by-step instructions. No matter what size speaker you choose, you’ll need to drill new screw holes in order to secure the adapter brackets needed to hold the speaker in place. They're deeply discounted with your speaker purchase.

The easiest way to do this is to hold up the speaker bracket around the opening, mark where the new holes will go, then drill out the new holes. A wiring harness is not available for the Altima's standard system, so you’ll need to cut off the factory connectors and splice the vehicle's speaker wires to your new speaker wires.

nissan altima front door speaker

To install your new speaker, you'll need to cut off back of the factory plastic speaker bracket. (Crutchfield Research Photo)

On Bose® equipped models, the door panel removal process is the same, but everything else is a bit easier. There’s more space available, so a wider variety of speakers will fit. A 6-3/4" speaker will drop right in (once you remove the tabs mentioned below), but 5-1/4" or 6-1/2" speaker will also need an adapter bracket.

In all cases, you’ll need to remove two "speaker line-up" tabs in order for the speaker to mount flat. With 6-1/2" and 6-3/4" speakers, you’ll need to cut off the back of the (plastic, thankfully) factory bracket in order to create enough depth or magnet diameter for the new speaker. We do carry speaker connection harnesses for the Bose system, and they're specially-priced when you purchase your speakers from Crutchfield.

The Bose speakers are all 2 ohm, by the way, so when you’re shopping, be sure to look for lower-impedance replacements, like Infinity or JBL.

Tools needed: Phillips head screwdriver, small flat blade screwdriver, panel tool


All Altimas have tweeters mounted in the "A" pillars. Getting to them is simply a matter of prying away the pillar at the top and sides, then gently pulling it out of the dashboard. Replacing the tweeters is a little tougher. The available mounting height is 0.654", and you’ll need to fabricate a mounting bracket. Our universal backstraps will help, because they can be cut or bent to the size or shape you need for your Altima.

A wiring harness is not available, so you’ll also need to splice the vehicle's speaker wires to your new speaker wires. A set of Posi-Products connectors can make this easier. These wonderful little things help you make connections without crimping, soldering, or tape. Just strip your stranded wires, insert them in the caps, then hand-tighten the two caps together. The wire ends get locked between opposing cone shapes to create a water-, dirt-, vibration-, and heat-proof housing.

Tools needed: Phillips head screwdriver, panel tool

nissan altima rear door

Bose-equipped Altimas have a speaker in the rear door. (Crutchfield Research Photo)

Rear door speakers (Bose® only)

If your Altima is equipped with the premium 8-speaker Bose system, it has 5-1/4" factory speakers in the rear doors. Replacing them isn’t hard, but you might have to do some minor tweaking to make the new speakers fit. As with the front models, you’ll need to remove two "line-up" tabs on the factory bracket to make the new speaker mount flat.

A number of aftermarket 5-1/4" speakers will fit in this space, but depending on the magnet diameter or mounting depth of the new speaker, you may need to remove the back of the factory mounting bracket to create the needed space. Other than that, installation is pretty straightforward.

Tools needed: Phillips head screwdriver, small flat blade screwdriver, 8mm socket

nissan altima rear deck

The Altima's rear deck speakers are top-mounted. You'll need to remove the rear seat to replace them. (Crutchfield Research Photo)

Rear deck speakers

The Altima’s stock 6"x9" rear deck speakers can be replaced by same-size aftermarket speakers, or you can install 5-1/4" or 6-1/2" speakers using brackets. The swap is pretty easy once you get to the speakers, but getting there involves removing the back seat and several trim pieces. There’s nothing seriously tricky in the 10-step (by our count) process, but there are 10 steps.

You’ll want to allow plenty of time and remind yourself to have plenty of patience. You’ll also want to have an old (but clean) blanket or sheet to protect the seat and trim pieces while they’re out of the car. Don’t forget to test speaker operation before you put everything together again!

Tools needed: Panel tool, 8mm and 12mm sockets

Shop for speakers that fit your Nissan Altima

nissan altima trunk

The Altima has plenty of room for thump in the trunk (Crutchfield Research Photo)

Bass in your Nissan Altima

While there aren’t any custom-fit enclosures available for the third-generation Altima, the spacious trunk gives you plenty of space for a good-sized sub and an amp. The available sub box space in the trunk measures 40" W x 15" H x 42" (at bottom) to 34" (at top) D. If you value cargo space, a powered sub will also work nicely.

Shop for vehicle-specific subwoofers for your Nissan Altima

Other options for your Altima

Here are some other ideas for making your Altima more fun and more functional:

dynamat door kit

Dynamat door kit


Some reviewers noted that the Altima produced a surprising amount of road noise. If you’re installing aftermarket door speakers, you might want to install a Dynamat Xtreme Door Kit. This sound-deadening material will quiet road noise and ensure that you hear your speakers at their best. One kit will take care of the front doors.

Digital media receiver

Just because you’ve tossed out your CD collection and gone digital doesn’t mean you have to settle for marginal sound quality. If you’re CD-free, but still want great stereo sound, a digital media receiver is a great choice for your Altima.


Installing a security system in your Altima isn't easy (security systems rarely are), but it's definitely a good idea. Our Crutchfield Advisors can help figure out what you need to get the job done, but we usually recommend taking your car and new gear to a professional installer.

Shop for car security systems for your Nissan Altima

Find the audio gear that fits your car or truck

Visit our Outfit My Car page and enter your vehicle information to see stereos, speakers, subs, and other audio accessories that will work in your vehicle.

  • Jordan Wright from Brattleboro

    Posted on 4/7/2021

    So I just put subs into my 02 Nissan Altima with a new head unit but once I hook them up only my subs work and not the in car speakers. What is my problem here? Been looking up every where to find out what is wrong

    Commenter image

    Jon Paul from Crutchfield

    on 4/8/2021

    Jordan, This could be a couple of things. Have you checked the connections? Are you using the correct adapters? Are you powering the subs from the receiver or from an amp? Hard to say from here, honestly. With questions like this, it's always better to have a conversation with a real live human. If you bought your gear from Crutchfield, you can call Tech Support for free help troubleshooting your system.
  • shane from ottawa

    Posted on 9/9/2018

    hey I have a o4 Altima with the Bose package was wondering do yu know how many watts the tweeters are I'm looking to upgrade but can't find what the watts are wanna buy new tweeters but want louder not quieter

    Commenter image

    Jon P. from Crutchfield

    on 9/9/2018

    Shane, I've sent your question to our sales team, and they'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.
  • Commenter image

    Jon Paulette from Crutchfield

    Posted on 7/11/2016

    PG, If you bought your gear from Crutchfield, you can call Tech Support for free help troubleshooting your system. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Check out our tech support page for details.

  • PG from Los Angeles

    Posted on 7/10/2016

    Jon. Hello. Replacing non bose 2003 head unit. Speakers have "NDSS" on them, so I'm saying it's non bose. New hu will be with 4volt 6 preouts Kenwood. Using Metra 70-70551 Do I need an loc for this? Or is the Metra enough to give me decent sound? Thank you for your help!

  • Commenter image

    Jon Paulette from Crutchfield

    Posted on 7/5/2016

    Hoa, Sorry to hear that. Factory radio fixes aren't our thing (We're more into replacing than reprogramming...), but you might get some good advice from an Altima owners' forum. If that doesn't work, enter your vehicle info into our Outfit My Car tool and start shopping for something new. Good luck!

  • hoa pham from fort smith

    Posted on 7/3/2016

    how i can reprogram my 2003 nissan altima radio . the am /fm working but the cd player it say error 3if you have the code can you send it for me

  • Commenter image

    Jon Paulette from Crutchfield

    Posted on 7/24/2015

    Ian, we sent your question to our sales team for the best answer. They'll be contacting you via email soon. For immediate help, you can contact them via phone or chat.

  • Ian from Atlanta

    Posted on 7/23/2015

    2003 Nissan Altima- I am wanting a new stereo system in my car and i want a headphone jack so i can connect my ipod and the factory stereo does not have a head phone jack on the front, which stereo system gives the most bang for your buck

  • Commenter image

    Jon Paulette from Crutchfield

    Posted on 7/17/2015

    Mike, I checked with one of our astoundingly knowledgeable techs, who explained that this is probably a connection issue or an internal short in the radio. With a factory radio, the ground shouldn't be an issue, provided that the ISO screws are tight and the radio is securely mounted. His big question was whether or not you're losing your radio presets when the radio turns off. If you're not, then the Constant power line is fine, and you need to check the connection on the ACC/Ignition wire. If you are losing the presets, you should check the connection on the Constant power wire. If this is happening with an aftermarket receiver, though, there might be a grounding issue. Best thing to do is check all your connections and make sure the radio is securely mounted. Hope this helps!

  • Mike Culligan

    Posted on 7/17/2015

    2004 nissan altima 2.5 - Radio Problem. The radio has started to cut in and out - when I hit a bump, step on the brake pedal, make a hard turn to the left or right. Have you got an answer for this? I figured that it could be a bad ground connection, where on the chassis is the radio and antenna located?