MP3 Player "input" for Car Stereo.




This instructable was inspired by so thank you "aka_bigred" who was the original author. This mod will allow you to add an MP3 player input jack to your car stereo.

This is made for a Stereo with a CD player WITHOUT an AUX option.

Caution. I take no responsibility if this messes up your Cd player, your MP3 player or worse. This mod is not perfect but it works for my purposes. To you nay sayers keep it to yourself.

This mod requires you to take apart and reassemble your cars cd player if you don't feel comfortable doing it then don't

The items I used in the mod are:
Pioneer DEH-3400 (Make Year 2002)
30 Gig IPOD video
Old pair of headphones

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Stereo Removal

Remove the car stereo. I did not take pictures because everyone has a different stereo.

Step 2: Disassemble

Now that you have your stereo apart it might look something like this. On the left side is the main unit. The right side is the cd player itself and this is what we will focus on from now on.

Step 3: Find the "input"

Depending on the model of Stereo that you have you should have a "ribbon wire" that connects cd player to the main unit. Where the Ribbon connected to the cd player is where you want to look. The image attached is up close.

If you look closely you can see to the right of where the ribbon is attached it says on the board "ROUT" , "LOUT" and "AGND" These are the three connections that we need to make.

I can't say if it is like this for every cd player but it works for mine. This idea here is we are tricking the CD player into thinking that is it playing a CD.

Step 4: Solder Time

Now it is time to take that old pair of headphones and cut the speakers off. The headphones that I had was as described.

Left - Green wire and bare copper wire. Green is Pos.
Right- Red wire and bare copper wire. Red is Pos.

Solder both copper wires to AGND
Solder the Red to the ROUT and the Green to the LOUT

Step 5: TEST!

Before you go any further make sure it works!

Step 6: Seal It!

We don't need to start any fires or short out something so get some liquid electrical tape and put it on the soldered points.

Step 7: Reassemble

Reassemble the stereo. You might want to tie the wire into a know somewhere on the unit. That way when someone decides to pull on your nice new "Aux" cable it doesn't get ripped out!

Step 8: Silent CD

Now this is definitely NOT my idea or my file. Like I said before this was "inspired by" with out this idea it wouldn't work so thank you.

Burn a CD with the silent track and just fill the cd with the track. This way the Cd player "plays" a silent cd and we HEAR the mp3 player bi-passing the CD unit.

4 People Made This Project!


  • Made with Math Contest

    Made with Math Contest
  • Multi-Discipline Contest

    Multi-Discipline Contest
  • Robotics Contest

    Robotics Contest

89 Discussions


9 years ago on Introduction

Tried this a couple weeks ago on my '02 Focus and its standard issue p/n 1S4F-18C838-BA   AM-FM-CD (sgl disc) ........and IT WORKED GREAT.  Thanks for a complete, very well written guide.  Added a couple pix to show location of R and L Out and Grd terminals on this board. 

2010 01 20th 035a.jpg2010 01 20th 035b.jpg
3 replies

Reply 8 years ago on Introduction

Awesome, I am glad that it worked out for you. I am thinking of doing in it a Honda CRV next.


Reply 2 years ago

hi can you help me please I have an kenwood with minidisc I dont now what to do


Reply 3 years ago

Hi can you plz help me to find LOut and ROut plz ?. I'm posting some pics thanks.

so i took my stereo out yesterday and did this but instead of connecting the cable to the cd player and using a silent cd i just hooked it to my radio tuner. it was just on the bottom of the main board. there were right and left outs and two grounds. it works really well. when an ipod or my laptop is plugged in it just takes over the radio. then if you want to listen to the radio unplug the ipod or laptop or whatever you have. i had a problem with a high pitched electric whine but only sometimes so i fixed this by messing with the audio settings bringing the high down to 0.


3 years ago

Hi can someone help me to find LOut and ROut plz ?. I'm posting some pics thanks.

1 reply

2 years ago

Pioneer EEQ MOSFET 50wx4 deh-1850.

I'm lost. Does anyone know where the R/L outs are? They aren't labeled on the board. Thank you

1 reply

Reply 2 years ago

Same problem here....Did you found any solution?

Jose AntonioM29

2 years ago

Hi. Can you help me which are my Lch Rch and ground I have a DEH-2100 pioneer car stereo

Jose AntonioM29

2 years ago

I have a DEH-2100 pioneer car stereobut dont know how to find Lch Rch and ground for the Aux cable. Please help.


2 years ago

thanks a lot man, u a genious


2 years ago

I want to attempt this sooo bad! Im gonna wait until i have cash to replace my cd player...well done!


3 years ago


I have a JVC but can't find the input lines.
I've the schematics.
Need some help...

Many thanks!


3 years ago

Hi, I've had this mod for over a year and it works great with my iPod. However, when I connect an android phone, the phone doesn't seem to detect that something is connected. When I switch to radio the phone instantly detects "headphones". Then I switch back over to CD and it works, but the audio is terrible, almost inaudible. I suspect it is because of the silent CD interfering, which is odd since it works fine with apple products. Anyone who has the same problem/fix? Thanks in advance :)


4 years ago

So I did this (before reading this), but audio wasn't playing until I play a CD, so THANK YOU for leading me to Silent CDs! I can play my aux over top of a CD I have but I didn't want other audio in the background so I burned a Silent CD filled with 5 min tracks. My Pioneer CDA-9851 recognizes the cd and plays the silent tracks but for some reason I cant play aux over top of these silent tracks...

Thoughts anyone?


4 years ago

I did this on pioneer deh-1300 and it's great and sound quality is good.
I just have one problem - when I connect my mp3 to aux port and charge it with car charger I here some static.
I don't know why this happens or what can I do to fix it.


4 years ago

I did this on a pioneer DEH-1300 and it worked perfectly. Thanks for posting.


5 years ago on Introduction

i installed this in my sister's '04 Pontiac Grand Prix, and it partially works. when I plug the AUX cable into my mp3 player, it recognizes that "headphones" have been plugged in. but, when I plug the other end into the input, the mp3 player believes the headphones have been unplugged. however, if I plug into the mp3 player, start playing a song, then plug into the input, it plays. once the track ends though, the mp3 player acts as though the headphones have been unplugged again, and I have to unplug from the input, start playing a song again, and then plug back in. of course, it then only works for 1 song, and then repeat the process. any thoughts?