Car Auxiliary Input Not Working?

Question

My mother has a 2007 Chevrolet Cobalt with an auxiliary input built into the dash. I have been trying to help her setup her mp3 player but the auxiliary jack does just not seem to work
correctly. I run the male/male cord from the mp3 player (2.5mm side) to the auxiliary (3.5mm) and then I put the auxiliary button on the panel. I read the instruction booklet and did exactly as it says to do. More or less all it says to do is plug any MP3 player in and press the auxiliary button to play.

Now I've found something unusual, if I plug the 3.5m into the headphone of the MP3, and the 2.5m in the auxiliary jack (which does not fit--too small) the music will play. Since the 2.5 is too small it will fall out if I let go of it, but it play the music fine.

I tried connecting everything with two different MP3 players and two different cords, but the same thing happened. Does anyone have any suggestions?

Edit: it's built into the cd panel area.

I have not, though I have considered, I was not sure if it made a difference. I will try that asap unless someone has good reason not to.

Answer 1

Have you tried a cable with a 3.5mm jack at each end, using the headphone jack on the MP-3 player? It sounds like the problem is the 2.5mm jack on the MP-3 player, which I assume is a different jack from the headphone jack. A 3.5mm to 3.5mm stereo cable can be found for around $5 just about anywhere.

The only difference will be that the headphone jack will be affected by the MP-3 player's volume control. Just adjust it until it's a comparable volume to the radio tuner, and leave it; you can adjust it afterwards with the radio's volume control.