IS THERE ACTUALLY AN AUX PLUG FOR MP3 PLAYER/I-PODS IN THE 2005 FORD FIVE HUNDRED STEREO SYSTEM? THERE'S AN AUX BUTTON ON THE STEREO BUT I DONT SEE A PLUG.

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Jack up the car, put it on jack stands and then slide under it.

you said CAN , i bet you meant CAN'T or CAN NOT. right?
the AUX port is just a line input, analog audio input,
it dont know MP3 .
it only amplies the analog audio found there.
you connect any device, to AUX. push play on the device.
then put car radio in to AUX input mode and play. the audio.
that is all there is to it.
the external device does all the heavy lifting, reading a file, and decoding it (mp3 decode) and then sends raw analog audio out.

the cable is sold and radioshack, or walfart or many other stores,
Target, most MP3 players, come with this cable,
they use mini phone plugs, stereo, type,. (3 contacts)

According to the book, the relay is incorporated into the smart junction box. There may not be an actual relay you can replace.

It simply means that its time for routing service and maintenance on your car. This will normally be reset when you take it in for an oil change. 1. Ford has issued a Special Service Message (SSM), stating that the owner's manual procedure is incorrect, and giving a revised procedure. The following is the text of the SSM:

18562 2005 FREESTYLE/FIVE HUNDRED/MONTEGO - OIL LIFE RESET PROCEDURE
THE 2005 FREESTYLE, FIVE HUNDRED, AND MONTEGO VEHICLE OWNER'S GUIDE OIL LIFE RESET PROCEDURE IS INCORRECT. TO RESET OIL LIFE ON VEHICLES WITHOUT MESSAGE CENTER, USE THE TRIP/RESET BUTTON TO TOGGLE THE ODOMETER DISPLAY TO 'OIL LIFE XX%'. THEN PRESS AND HOLD THE BUTTON FOR 10 SECONDS TO RESET TO 100%. THE INSTRUMENT CLUSTER WILL BEEP WHEN THE OIL LIFE IS RESET.
FOR VEHICLES WITH A MESSAGE CENTER, PRESS 'SETUP' TO DISPLAY 'PRESS RESET FOR SYS CHECK'. PRESS AND RELEASE 'RESET' TO START SYSTEM CHECK. WHILE 'OIL LIFE XX%' IS DISPLAYED, PRESS AND HOLD 'RESET' UNTIL 'IF NEW OIL HOLD RESET' IS DISPLAYED, THEN RELEASE. PRESS AND HOLD 'RESET' AGAIN UNTIL 'OIL LIFE SET TO 100%' IS DISPLAYED. THE INSTRUMENT CLUSTER WILL BEEP WHEN THE OIL LIFE IS RESET.
EFFECTIVE DATE: 04/20/2005

80-100K miles

Its uses a Bosch c3760

http://www.boschautoparts.com/Technical%20Resources/Cabin%20Air%20Filters/CabinAirFilterInstallation.pdf

Go to the PDF scroll down to the installation isntructions for the C3760 cabin filter. It is located under the hood, actually under the cowl by the window

yes you can connect any player with analog output

if it is the sony unit then there may be a jack in the bach of the set for an i pod or mp3 player

please let me know if this helps
cheers
big mike :)

If you just want to plug in your MP3 player to the radio open the glove box and you will find an MP3 socket near the latch of the lid. Plug in your player and press the auxilary button on the radio to get the player to work via the radio.