Mercury 2003 Audio Mute OEM pinout

Matrixman - thanks for the suggestion.I used a 1K ohm resistor instead of the fuse to limit current, grounded one end of the lead, and found the terminal # I needed --- it's terminal 1 on the 24 pin connector (as indicated on the "face" of the connector  body).  Physically, it's on the bottom row about in the middle of the connector, and is w/o any factory wire  (You'll need to provide your own socket insert).  As soon as I ground this pin, the audio muted and "PHONE" was displayed on the radio face.

Thanks again.

Jim Malloy

I have a 2003 Crown Victoria Police Interceptor and want to do the same thing. How are you getting the negative signal from your phone?  I was hoping to do something similar for my car.  My goal is to have the car speakers be used for the phone and have a remote microphone.  I was hoping to use the ear piece jack somehow so that any phone could be used in my car.

Is it possible to use relays to feed the speakers from another small amplifier?  I was thinking if I could figure out which wires feed the speakers I could hook them up to relays and have the power from the amplier when I turn it on switch the relays, cut off the head unit and feed the speakers from the small amplifier.  Am I way off base here?  New to this and just trying to figure something out safety.

The negative signal comes from the Nokia hands-free car kit (charger/cradle, small speaker, microphone, and central control box).  Most OEM car kits that I've seen have an output for this function. I connected the MUTE wire from the carkit to pin 1 as described above.

I don't know whether you can fully integrate the car kit w/ the head unit so it could use the car speakers for the phone; also I'm afraid I can't help you with the hookup w/o a car kit.  I think that the phone signals you need to use are on the "bottom" edge of the phone (ring sense, place call, etc to automute the radio)  You should be able to get mic in / audio out from the earphone connector though.  If you look at an "ear bud" type of handsfree, the connector is "stereo" and uses one of the connectors + barrel for audio out, and the second connector + barrel for mic in.