PAC RP4-FD11 Wiring Interface

Connect a new car stereo and retain steering wheel controls, RAP, and factory amp in select 2005-up Ford, Lincoln, and Mercury vehicles

Item #: 541RP4FD11

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42 Reviews

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PAC's RP4-FD11 radio replacement interface lets you replace the factory radio in select 2005-up Ford, Lincoln, Mazda, and Mercury vehicles. You'll still retain your factory steering wheel audio controls, rear seat entertainment (RSE) system, retained accessory power (RAP), and the use of your Ford factory amplifier, if present.

The RP4-FD11 interface eliminates the need for the steering wheel audio control adapter that's usually required for a Ford-built vehicle, saving you some more cash. Warranty: 1 year.

Important Note: You'll lose your fader control if you have an amplified system in your vehicle. The RP4-FD11 adapter does not work with your SYNC system; you'll need PAC's MS-FRD1 adapter to maintain that functionality. See Details for a list of compatible car stereos.

Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this model is compatible with your vehicle.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research

What's in the box?

Download owner's manual

  • Radio replacement/SWC interface module (for Ford/Lincoln/Mercury)
  • RP4-FD11 wiring harness
  • 12" Steering wheel control harness (4-pin connector to 3.5mm/blue wire)
  • Instructions

Product Research


Overview: The RadioPro4 (RP4-FD11) is a radio replacement and SWC (steering wheel control) interface that comes pre-loaded with amplifier retention and SWC software, navigation based output signals, and firmware that retains all of the vehicle's original safety and convenience features when replacing the factory radio with an aftermarket head unit.

Functionality: The RP4-FD11 interface allows the replacement of a factory radio in select Ford/Lincoln/Mercury vehicles with the CAN-bus system. Using this interface will retain factory features such as steering wheel controls (SWC), rear seat entertainment (RSE), rear seat control (RSC) and, the factory audio amplifier whenever the original radio is removed. The RP4-FD11 also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger, and parking brake.

Note: If the vehicle is equipped with the Sony factory stereo system, adjust the fader to your preferred front/rear setting before the factory radio is removed. Neither the aftermarket radio nor the RP4-FD11 interface has the ability to adjust the factory amplifier's fader. The RadioPro4 (RP4-FD11) does not retain your vehicle's factory SYNC system. SYNC retention requires the PAC MS-FRD1 radio replacement interface (541MSFRD1, sold separately).

Vehicle Compatibility: The RadioPro4 (RP4-FD11) is compatible with select 2005-up Ford, Lincoln, Mercury vehicles with MSCAN databus radios. Compatible vehicles as of 7/13/2012 include:

Make Model Year
Ford Edge 2007-2010
Escape 2008-2012
Expedition 2007-2012
Explorer 2006-2010
Explorer Sport Trac 2007-2010
F-150/250/350/450 2009-2012
Flex 2000-2012
Focus 2008-2011
Freestyle 2006-2007
Fusion 2006-2012
Mustang 2005-2012
Taurus 2010-2012
Lincoln MKS 2009-2012
MKT 2010-2012
MKX 2007-2010
MKZ 2007-2012
Navigator 2007-2012
Zephyr 2006
Mercury Mariner 2008-2011
Milan 2006-2011
Mountaineer 2006-2010
Mazda Tribute 2009-2011

Vehicle Specific Notes: Not compatible with 2008 F-250/350/450 with XL trim (fleet vehicles). Does not retain RSE functions in 2006-2007 Ford Freestyle. Does not retain the THX amplifier in 2006 Lincoln Zephyr.

Note: Please consult Crutchfield's Outfit My Car to see if your vehicle is compatible. Visit for the most up to date information.

Radio Select Switch: The radio select rotary switch on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle.

# Dial Radio Manufacture
1 Alpine
3 Kenwood
4 Clarion
5 Valor
7 Dual, Pioneer, Sony
8 Blaupunkt

Wiring Connection Chart: The included wiring harness features the following hardwire connections.

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna
Blue/White Amp Turn On
Orange/White Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -
Red/White Parking Brake Detection (-)
Purple/White VSS Output
Green Reverse Output (+)

SWC Compatible: The interface comes pre-programmed for all of the vehicle's factory SWC functions and does not require programming, unless you wish to re-assign the SWC functions to different buttons. The SWC functions can be easily programmed; see control settings and functions below.  The interface retains programming even if your vehicle's battery is disconnected.

Switch Position 1 2 3 4 5 7
Radio Alpine JVC Kenwood Clarion Valor Dual Pioneer Sony
Control Functions Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/-
Mute Mute Mute Mute Mute Mute Mute Mute
Source Source Source Source Source Source Source Source
Preset +/- Track +/- Play Search +/- Track +/- Preset +/- Preset +/- Preset +/-
Track +/- Band/Disc + Track +/- Band Cursor up/down Track +/- Track +/- Track +/-
Power Preset/Disc - Disc/FM + Send OK Band Band Band
Play/Enter Select Disc/AM - End *** *** Phone Menu ***
Band/Program Attenuation Answer *** *** *** Answer Call ***
Receive (phone) Phone Receive/Reject *** *** *** *** End Call ***
End Voice Dial *** *** *** *** Voice Activation ***
*** Power *** *** *** *** *** ***
Note: The SWC harness contains a Blue/Yellow wire and a 3.5mm connector. You will only use one of the connectors, based on your type of aftermarket radio. The Blue/Yellow wire supports Kenwood, Newer JVC, OEM and Blaupunkt radios. The 3.5mm jack supports Alpine, Older JVC, Clarion, Pioneer, Sony, Valor, and Dual radios. Not compatible with Soundstream head units.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

PAC RP4-FD11 Wiring Interface Reviews

Average Customer Review:

42 reviews
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Great radio for the $

Written By Robb, Westland, Mi on Thursday, March 26, 2015

Crutchfield Customer Review (What's this?)

Got this for the HD Radio feature, easy to install, with provided installation components, made my 2007 milan, rock!, great sound, Bluetooth works, phone through radio good.

Pros: Features, price, ease of use

Cons: not found any yet, everything I've tried works

Works well

Written By Dave, Pennsylvania on Sunday, March 22, 2015

Crutchfield Customer Review (What's this?)

Works well just plug and play in my 07 Ford Expedition limited with rear entertainment system and new Jensen VX7020

Pros: plug and play ,retain SWC and RES

Cons: the only con is the RES sound will not play threw sound system Crutchfield offered to replace unit. Works fine for my use I can listen to music up front,kids can watch movie in rear with headphones

It works most of the time

Written By JCool, Connecticut on Saturday, March 07, 2015

Crutchfield Customer Review (What's this?)

This device works about 9 times out of 10 when I press the steering wheel controls on my 2011 Ford Escape. I don't know if that's a limitation of the device, the steering wheel controls, or the head unit I purchased. I'm happy it was pre-programmed. The instructions are kind of a mess, I had to call Crutchfield more than once but they saved the day as always.

Pros: pre-programmed Crutchfield Support was great works most of the time

Cons: does not work all of the time terrible instructions


Written By cfulco1181, Chicago, IL on Tuesday, February 24, 2015

Crutchfield Customer Review (What's this?)

Installed in 06 mountaineer with Kenwood hd758bt and works flawlessly! Preprogrammed to work right out of the box!

Pax working interface

Written By John, Texas on Friday, February 13, 2015

Crutchfield Customer Review (What's this?)

Installation wasn't too tough. Be patient. Had to call tec support twice. Each time Crutchfield walked me through it.

Pros: Works well.

Cons: Poor instructions from manufacturer.

Hardware for install

Written By Avh-x5600, Jacksonville, FL on Monday, January 12, 2015

Crutchfield Customer Review (What's this?)

The hardware and installation kit

Pros: The hardware and installation kit Crutchfield sent with receiver was spot on easy to use no problems at all

Cons: None

PAC RP4-FD11 Wiring Interface

Written By Loyal Customer, Oregon on Thursday, January 08, 2015

Crutchfield Customer Review (What's this?)

I bought a Pioneer DEH-X8700BH stereo and this PAC RP4-FD11 Wiring Interface to retail the steering wheel controls for my system. In the years as a Crutchfield customer I've never had any issues with any product I've bought from them. But I guess it was just meant to happen, with this product.

Pros: I've never had the need to use this type of product in the past but I guess it would've been great had it worked. I took my stereo to a professional and have it installed. The guy installing this PAC wiring interface said he's used this product and has always had good things to say about it.

Cons: The issue we ran into was that this PAC unit would not program to my specific steering wheel audio controls, not matter how many times we tried over and over and over again. Again, the guy installing this product said that it was weird that he couldn't get it to work because he's never had issues with it before. So I guess I happen to purchase the one faulty PAC wiring interface. Other than that, I'll take the professional's word on this being a great product.

PAC RP4-FD11 Wiring Interface

Written By Anonymous, North Branford CT on Sunday, January 04, 2015

Crutchfield Customer Review (What's this?)

This unit makes install very easy my only complaint is the swc has a delay From when you push the volume or track buttons and the stereo reacts. Very frustrating, probably won´t use swc control

Pros: easy install good instructions

Cons: Does not really integrate Swc

makes installation a breeze

Written By Jonathan, Jeffersonville Indiana on Tuesday, December 30, 2014

Crutchfield Customer Review (What's this?)

This harness made the installation a breeze. The directions are straight forward and don't leave room for error!

Pros: Great directions and unlike the harnesses from the past, they now have an in line fuse which was a minor complication in the past.

Cons: None! Well worth the money.


Written By juana, bon wier tx on Tuesday, December 09, 2014

Crutchfield Customer Review (What's this?)

Works great!

PAC RP4-FD11 Wiring Interface

Written By Tim W, Caledonia, MI on Sunday, November 23, 2014

Crutchfield Customer Review (What's this?)

Exactly what I needed to maintain my steering wheel controls on my 2006 Ford Explorer. By following provided instructions and setting the address wheel on the interface body, the product worked seamlessly with my Sony aftermarket radio.

Pros: ease of installation

Cons: none

Aftermarket interface

Written By Jay, Austin,TX on Wednesday, November 05, 2014

Instructions are fairly clear, except for the "Blue" wire which states that it only needs hooked up if you have a powered antenna. This should say an antenna with a powered amplifier. This would avoid all confusion. If you are not sure, hook it up anyway. That is my suggestion, not Crutchfield's. I did not hook it up and ended up taking the dash apart twice.

Pros: Works great

Cons: Instructions could use improvement

Crutchfield response on Tuesday, November 18, 2014 This reviewer makes a good point. PAC's wording regarding the blue wire is a bit dated. We forwarded this review to PAC with a suggestion that they reword the wiring instructions. Also, even if things are going according to plan, it's never a bad idea to call our Tech Support team when you're prepping for an installation. We can always confirm and clarify what's needed. Crutchfield Tech Support is free with every purchase and for the life of the product.

Made installation a breeze

Written By DougP, Holland, OH on Tuesday, September 02, 2014

Crutchfield Customer Review (What's this?)

Made installation a breeze.

Pros: Easy to follow instructions

Cons: none

09 Ford Flex Upgrade

Written By Jolly S, Honolulu, Hawaii on Friday, August 22, 2014

Crutchfield Customer Review (What's this?)

Purchased this to upgrade my 09 Ford Flex without sync and navigation. This as very helpful in the wire connection for my Pioneer DEH-6600BS. Had no problem with wiring, but to keep the steering wheel controls you'll have go pay close attention to programming the item before closing up anything. I made that mistake so I had to pull apart everything and program my SWC before finishing up. Other than that the product worked as suppose to be. No major problems. Just need to pay close attention to the wiring diagram.

Pros: Easier hook up than splicing wires

Cons: take a while to handle the bunch of wires, its a bit bulky, but still able to tuck away for the finish

instruction not comprehensible

Written By Anonymous, Los Angeles on Tuesday, August 05, 2014

Crutchfield Customer Review (What's this?)

easy to wire/instal. Basic (original) steering wheel functions work, but I can not figure out how to modify them for double function. Called tech support and got sort of an explanation (!). still there's no way ... frustrating!

Pros: basic/original functions work

Cons: instruction very confusing/over complicated

Crutchfield response on Wednesday, August 06, 2014 Installing and programming a steering wheel control interface can indeed be a challenge. To add the double function capability (long press/short press), you have to manually program the interface. Our Tech Support team reached out to the customer to let him know that we'll be standing by if he wants to do that. They'll be glad to walk him through the process over the phone. Lifetime tech support comes free with every purchase from Crutchfield.

SWC adapter PAC RP4-FD11

Written By MarkW, Ham Lake MN on Saturday, August 02, 2014

Crutchfield Customer Review (What's this?)

I used this to connect a Sony MEX N5000BT to a base model 2010 Mercury Milan. It works as advertised. Hookup was no problem for this ex-Air Force radio electronics technician. My main complaint with this adapter is that it is overkill and overpriced. It included wiring to connect to a lot of other things besides my steering wheel controls. I think Crutchfield is now offering some cheaper and more realistic adapters now and that is a good thing.

Pros: Does what it is supposed to do.

Cons: Overpriced. Includes a gaggle of unneeded wires for systems with rear seat controls (which mine doesn't have).


Written By Micky, Brooksville on Saturday, July 26, 2014

Crutchfield Customer Review (What's this?)

I haven't installed a radio in a car since the early 80's but with this easy to use interface it was a breeze. My stereo worked perfectly with no glitches. A must for professional result installation!

Pros: Easy to use

Cons: None

PAC RP4-FD11 Factory Integration Adapter

Written By Bill, Racine,WI on Wednesday, May 21, 2014

Crutchfield Customer Review (What's this?)

This is a must for ease of installation and integration with existion vehicle works great and is easy to install.

Pros: Great value for what this adapter is equipped to do to keep your new system in sync with exisiting electronics in your vehicle.

Cons: None

Works Great!

Written By Brian, Kennett Square, PA on Saturday, April 26, 2014

Crutchfield Customer Review (What's this?)

It was easy to hookup and my steering wheel controls work exactly as they should. I used it in a 2007 Ford Fusion with 6 speakers.

A couple of the descriptions of the wires didn't match up exactly but you can figure I out, based on their functions. The wires were long enough for the hookups, but a little more length on them would have made stuffing the unit in the dashboard a little easier.

It also gives you the ability to program different functions into your steering wheel buttons, but I have not true That yet.

Overall, it is a very good product. I would not have installed an aftermarket radio without it.

Pros: Easy to use, keeps steering wheel controls

Cons: Wires could be a little longer

Adapter rocks!

Written By FHG, Dublin, Oh on Tuesday, April 22, 2014

Crutchfield Customer Review (What's this?)

This adapter was perfect for my installation of the new Kenwood head unit. I was concerned that its bulk would not fit in the dash cavity behind the new audio unit, but there was absolutely no problem!

Pros: Ease of "plug-and play" installation.

Cons: Directions were somewhat vague in regards to the adaptation of the steering wheel controls. We had to abandon using them as a result. Otherwise, a five star rating would have been easily earned.


Written By Anonymous, Latrobe, pa on Friday, March 28, 2014

Crutchfield Customer Review (What's this?)

Everything worked great. I wish there was a smaller harness for a cheaper price since a lot of the harness was unused but it worked beautifully and i 'm very pleased with the end product.

Pros: Everything worked

Cons: Price and over complicated

It works

Written By GL, Boston, MA on Sunday, March 09, 2014

Crutchfield Customer Review (What's this?)

It works ok, but as mentioned in other reviews for this unit in a Ford Fusion the stock console will only show DVD not the clock. Also each steering wheel control press registers on the console and stays there until another steering wheel control is pressed or the car is shut off. I think it should blank out the last command after some 5 or 10 seconds. I talked to PAC and they cannot fix this with a firmware update.

Pros: steering wheel controls are retained

Cons: The output to the stock console should be better.

A snap

Written By Roy, Winchester, Va on Thursday, March 06, 2014

Crutchfield Customer Review (What's this?)

Very easy to install no set up and everything works great!

Pros: easy install !

Cons: Harness to long.

PAC RP4-FD11 Factory Integration Adapter Reviews

Written By berdman, ChiTown on Sunday, February 16, 2014

Crutchfield Customer Review (What's this?)

This adapter works as designed and my steering wheel controls properly operate my new Kenwood radio which has awesome sound on 2009 Ford Escape. . Now the screen will not show the clock anymore, but the radio does show the time and it permanently displays "DVD" in the upper left corner.

Works as advertised

Written By Riccarr, Portland, OR. on Thursday, January 16, 2014

Crutchfield Customer Review (What's this?)

This adapter works as designed and my steering wheel controls properly operate my aftermarket stereo. There is an annoying side effect on my 2010 Ford Fusion. My Fusion SE has a small LED screen display which showed the clock, and previously the radio station. Now the screen will not show the clock anymore, and it permanently displays "DVD" in the upper left corner.

Pros: Wiring and instructions are accurate and straight forward.

Cons: My Ford Fusion SE screen no longer shows the clock.

Crutchfield response on Monday, January 20, 2014 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

A must have

Written By Rick, Scranton, PA on Tuesday, November 19, 2013

Crutchfield Customer Review (What's this?)

Great item all my sterring wheel buttons work I put this in my 2008 ford escape

Pros: Very easy to install no programming needed just plug and play

Cons: None

If you want to keep your steering wheel controls this is a must buy!

Written By Robert A, Taylor, MI on Saturday, October 26, 2013

Crutchfield Customer Review (What's this?)

Great item to purchase if you want to keep factory steering functions! I thought it would be difficult to install but it was very easy and it works great!

Pros: Ease of installation and price.

Cons: My display where the factory clock doesn't show the clock anymore.

easy install

Written By Anonymous, Harrisburg pa on Tuesday, October 01, 2013

Crutchfield Customer Review (What's this?)

Its a good wire harness for the money. It should be! Easily installed...

Works great!

Written By Mike, NJ on Tuesday, September 24, 2013

Crutchfield Customer Review (What's this?)

All of the functions of my steering wheel controls work great with this adapter and my new Pioneer radio.

Pros: Plugs right into existing connectors, fast installation.

Cons: Somewhat bulky and hard to get behind the radio.

Double-press doesn't work on 2012 Focus

Written By Chris A., Alexandria, VA on Thursday, September 19, 2013

Crutchfield Customer Review (What's this?)

Programming this guy in a 2012 Ford Focus (without Sync) gave me a headache, but eventually I figured it out. The real trouble was that apparently the double-press functionality for the SWC that they say you can program in simply didn't work. After resetting to default, I was able to alter the single-press, and change my "source" button to a "phone" function that gave me hands-free calling with a JVC AV61BT. Other than the initial fuss, couldn't be happier with the result. Would be nice if the wiring was a bit longer to allow the programming unit to hang further in your dash so it was accessible by popping the armrest assembly vice taking out the head-unit bezel.

Pros: Gives a lot of flexibility for steering wheel control

Cons: Double-press functionality doesn't work on all models.

Amazingly Easy

Written By Captain Kirk, Salt Lake City, Ut on Thursday, September 12, 2013

Crutchfield Customer Review (What's this?)

I must admit, I do pride myself on being able to do a lot of my own car repairs and such, but electrical including stereos makes me nervous. But this was amazingly simple, I just matched wire for wire and plug and play.

Pros: Amazingly easy

pac rp4-fd11

Written By bobosan, Rochester, NY on Friday, August 30, 2013

Crutchfield Customer Review (What's this?)

This unit did everything it said it would. Was super easy to install and has even more options than I used. I would definitely recommend this product. This is also after I was told many times that there was nothing that I could use and retain the rear seat dvd. It all works you just cant control it from the front seat but you still can play it through the sound system.

Pros: Easy to install, works perfectly, retains factory steering wheel controls.

Cons: None


Written By Anonymous, louisville ky on Tuesday, August 13, 2013

Crutchfield Customer Review (What's this?)

Made the installation so much easier and all the controls on my steering wheel work flawlessly

PAC RP4-FD11 Wiring Interface

Written By Allan, Franklin, VA on Sunday, July 07, 2013

Crutchfield Customer Review (What's this?)

Unit I was attaching the adapter to was not on the setting list, had to call support.

Pros: Works as advertised

Cons: Had to call to obtain setting


Written By Brad R., Tipton, Ia. on Sunday, July 07, 2013

Crutchfield Customer Review (What's this?)

It works great, but the actual instructions are maddening. After some overthinking, and a call to Crutchfield's Tech Line, I got it installed and everything worked as advertised.

Pros: Works great.

Cons: VERY poor directions.

PAC RP4-FD11 Wiring Interface

Written By Anonymous, El Paso, TX on Monday, June 24, 2013

Crutchfield Customer Review (What's this?)

Product worked great. Made the installation sooo much easier and works flawlessly. Thanks!!!!

Great product

Written By Joe3fingers, San Diego, CA on Thursday, April 11, 2013

Crutchfield Customer Review (What's this?)

Works seamlessly with stock steering wheel controls. apple products interface best with USB while android products are better with Bluetooth connection

Cons: A lot of connections to be made

PAC RP4-FD11 Wiring Interface

Written By Anonymous, Wake Forest, NC on Friday, March 29, 2013

Crutchfield Customer Review (What's this?)

This made installation of the radio easy, and all of my controls on my steering wheel work. Definitely a must.

Pros: Works as advertised. All the connections required to make sterring wheel controls work.

Cons: Instuctions could have been written better.

Make sure firmware is up to date

Written By Paul, Wilmington, NC on Monday, December 31, 2012

Crutchfield Customer Review (What's this?)

When installed the dash buttons wouldn't work. After numerous phone calls, the supplier said the firmware needed to be flashed, requiring special equipment the installer didn't have. Good support from Crutchfield. Waiting on a replacement now.

Pros: Full access to all my built-in controls

Cons: Didn't have updated firmware.

much needed interphase

Written By Ratfink, waldport,oregon on Wednesday, December 12, 2012

Crutchfield Customer Review (What's this?)

Gota have it to make it all work. lil pricey

Pros: Fairly simple hook up.

Cons: Price!

Ford Radio Replacement Interface

Written By BP, Winona Lake, IN on Saturday, October 13, 2012

Crutchfield Customer Review (What's this?)

Have had it in three weeks and still working. You have to install it in a place that is accessible in case it loses memory so you can reprogram.

Pros: Works as stated so far.

Cons: Requires soldering or crimping connections.

PAC RP4-FD11 Wiring Interface

Written By LarryA, NPR,FL on Sunday, September 30, 2012

Crutchfield Customer Review (What's this?)

So easy to hook up. Like that it let me keep steering wheel controls.

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