Can't locate aux function

The 7400 does not have an RCA input, you need to purchase a separate adapter like this one. It is also known as a "CD-RB10" and a search on ebay will bring up plenty of options. Cheers, Dan

Push function to select Aux. Press Function until Aux appears.

This also happened to me, I just replaced the cable and works fine now.

Hello jaredsmick,

Yes, you should be able to plug your MP3 player into the DEH-P3700. You will need a cable. While I'm not certain as to what type of output jack your player has, it's most likey a "mini-jack". Here's a link to what it looks like:

http://www.3dcontentcentral.com/download-model.aspx?catalogid=171&id=10185

You'll also need to make sure that the "AUX" source is turned on in the Pioneer. To do this, press FUNCTION repeatedly until AUX appears in the display. Press up/down to turn ON or OFF and the status will be displayed.

Hope this helps.

push and hold the function button with the radio off but with the vehicles key on, it will take several seconds but it will beep and give you access to change several things including toe aux off and on
hope this helps!

there is an interconnector to connect this unit to the aux source (CD-RB20/CD-RB10)(sold seperately).
After connecting, press SOURCE until AUX appears in the display.
Press "play" on your ipod.
i sincerely hope this answers your question.

Call tech support! That's why these people get paid. Sites like this wouldn't need to exist if they did their jobs correctly!

I'm not sure what aux input you're using - but be advised that if you've plugged your mp4 player directly into the RCAs in the back that won't work - those are outputs, not inputs.

You need to use a Pioneer CD-RB10 (or CD-RB20 if you're running a cd changer, XM tuner, or any other IP-bus component) in order to get an auxiliary input.

If you've done that - you need to go to the initial settings menu and set aux input to 'on'. Instructions are in this link, page 89.

It sounds like you've connected to the front or rear audio RCA output.

Pioneer CD players generally don't have a direct auxiliary input like that - what you'll have to do is get a CD-RB10 adapter(it plugs into the CD changer connector on the back, and your cable would plug into that).

If your cd player is a DEH-P4600MP (mp3 player)then you have to turn off the player first, then press the button on the upper right hand corner of the faceplate and then scroll through the menu and find aux to turn it off or on with the "wheel" on the right on the faceplate. You will also find the alarm and clock settings there in the menu as well but the key is to make sure the player is off first while doing this or you can't access the menu. To use the auxillary input on the back of the unit you need to purchase (eBay has them) an aux input adapter ref CD-RB10 cable. Hope this helps.