PAC RP4-MZ11 Wiring Interface

Connect a new stereo and retain steering wheel audio controls, entertainment system, safety warning chimes, and factory amp in select 2008-up Mazdas

Item #: 541RP4MZ11

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PAC's RP4-MZ11 radio replacement interface lets you replace the factory radio in select 2008-up Mazdas. You'll retain your factory steering wheel audio controls, your vehicle's entertainment system, warning chimes, and the use of your factory amplifier, if present. This interface works with your Mazda's base or premium stereo systems, and retains all safety and convenience features. You'll also retain your Mazda's message display, which allows you to access your vehicle's system settings. Warranty: 1 year.

Important Note: If your vehicle is equipped with the factory premium system, the amp fader must be adjusted through the RP interface. (See Details.) 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. You can also call an Advisor for more information.

PAC RP4-MZ11 Wiring Interface Reviews

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It Works

Written By Top Jimi, Rhode Island on Friday, August 14, 2015

Crutchfield Customer Review (What's this?)

This product works as promised steering wheel controls do what they are meant to do.

Pros: Easy install!

Cons: none so far!!

Works well

Written By Erie, California on Wednesday, August 05, 2015

Crutchfield Customer Review (What's this?)

Bought this PAC to go with the Kenwood DDX9902S. It works very well. First of all the picture is of an older version. The version I received actually has RCA plugs on the speaker wires which is a MAJOR PLUS! Everything works as expected, even the steering wheel control on my 2014 Mazda CX-5. If you want to do more advance programming of the steering wheel controls, it requires you to access the PAC and push a button on it and watching the light on it blink. The instructions for programming weren't very clear, I had to do some reading elsewhere to figure it out. Downside of this is that if you decide to change steering wheel controls you have to pull out your head unit to access the PAC.

Pros: RCA plugs on it, steering wheel controls programmable.

Cons: Manual configuration that requires taking head unit out, programming it is difficult.

Works great in my Mazda5

Written By JFun, Georgia on Saturday, July 11, 2015

Crutchfield Customer Review (What's this?)

This adapter worked perfectly with my Mazda5. I did have to cut off the RCA connectors (as other reviewers have noted) but that was no big deal. I thought about installing female RCA's on my existing wiring but decided not to. It would be really great if the volume was displayed on my car's display as well as the radio but I understand that's not as simple as it sounds. It just says "Audio" and then "volume" or the mode when you change them. Does exactly what I expected it to.

Pros: Works great with my car

Cons: A little pricey

Good product for Mazda

Written By Mazda 5 install, Sacramento, CA on Sunday, June 14, 2015

Crutchfield Customer Review (What's this?)

This fit the bill for install into my Mazda 5. It was fairly simple to install. although having to cut off the rca connectors to link to the Pioneer wiring harness was a bit of an annoyance. The steering wheel integration works well. I just wished there was a way to integrate the bluetooth answer/hang up into the steering wheel controls.

Pros: worked as described

Cons: none yet

It works

Written By speed, Missouri on Monday, April 20, 2015

Crutchfield Customer Review (What's this?)

I used this kit on a 2010 Mazda 6 I Touring and everything works.

Pros: Ability to keep steering wheel controls plus the LCD display from the old system.


Written By Wiiland, Michigan on Thursday, April 16, 2015

Crutchfield Customer Review (What's this?)

Makes wiring easier and it's great to retain steering wheel controls. Wish they gave you a little more cord so that you could mount the box in the glove compartment since you have to press a button on it to reprogram any of the functions. Also, mine came with RCA plugs for a pre-amp already installed, but this wasn't reflected in the directions. I had to call in for support and then cut off the RCAs to wire to the speakers and everything worked fine.

Pros: Easy to use

Cons: Outdated instructions


Written By Fire Proof, Missouri on Thursday, January 29, 2015

Crutchfield Customer Review (What's this?)

I installed this SWC interface with a Kenwood DPX500BT head unit in my 2009 Mazda 6. After a few self-inflicted issues it went in without a single problem. The interface actually increased my control over the message center. I can now put messages and reminders up on the dash where I can't forget them. The installation was even easier than the one I did on my Bride's vehicle a few years ago. Truly Plug and Play. Read through ALL the directions; sometimes they're a little vague.

Pros: Simple to wire and easy to use. All my factory functions work perfectly.

Cons: I have no cons for this.

Works as expected

Written By nolig, Florida on Thursday, January 08, 2015

Crutchfield Customer Review (What's this?)

Pretty easy to connect and configure. Just about every wire color matched and the instructions explain the blue wires. My clock and steering wheel controls work.

Pros: Works great. Easy setup.

Cons: none


Written By Eric, Augusta, GA on Tuesday, January 06, 2015

Crutchfield Customer Review (What's this?)

Works as advertised. Installation at shop took more time than normal since he was unfamiliar with the product. However, once done controls work great and retained ability to change car clock. Can add multiple commands to SWC. Though chose not to use this feature.

Pros: Works great.

Easy installation, great directions

Written By Joel, Old Bridge, NJ on Monday, December 08, 2014

Crutchfield Customer Review (What's this?)

Easy install thanks to great, detailed instructions. As always, a great product provided by a great audio retailer.

Pros: Detailed, clear installation instructions

Cons: None


Written By Mazda CX-9, CA on Tuesday, September 09, 2014

Crutchfield Customer Review (What's this?)

This is a great product. Lets you keep your SWC and also the display info. From the different forums, I could not figure if I would still be able to use my gas mileage gizmo and reset it. So for anybody who wants to know-yes you can.

Pros: Makes the wiring and installation very easy. No need to tap in the car for reverse and parking brake wires (I also installed a rearview camera).

Cons: Some wires are extra and it took a few calls to tech support to be sure I am connecting them right.

Happy wife

Written By Ron, Pueblo, CO on Monday, April 28, 2014

Crutchfield Customer Review (What's this?)

My wife wanted to keep her steering controls so she got them!

Pros: Happy wife

Cons: Dissatisfied wife

SWC Perfection

Written By Scott M, Berwick, ME on Monday, March 10, 2014

Crutchfield Customer Review (What's this?)

This SWC adapter works great. It is pre-programmed, which makes it plug and play ready. I really like the customizable programs,. The instructions were straightforward and precise. I highly recommend this adapter to those looking to install in a Mazda or a Honda.

Pros: Slick Slick Slick install

Cons: Non that I can think of.

Steering wheel control more functional than before

Written By AndyC, Philadelphia, PA on Wednesday, January 22, 2014

Crutchfield Customer Review (What's this?)

Works great with my 08 Mazda CX7. I had to do some of the optional program as the out of the box programming left a little bit to be desired. But after a couple of attempts, the steering wheel controls do everything they did with the factory unit and more. It also allows me to easily adjust the separate LCD display that was controlled by the original factory head unit.

Pros: Easy to program

Cons: Lots of extra wires depending on installation

Great adapter

Written By Ames, Killeen, TX on Sunday, January 19, 2014

Crutchfield Customer Review (What's this?)

This steering wheel control adapter works very well. It is pre-programed, so it is basically plug and play. You can also add custom programs if you need to. Instructions are very clear, but I misunderstood one step. I called in and talked to tech support. There was no wait time and the technician helped me solve my problem right away. I would recommend this adapter to anyone with a Mazda. It works very well for me.

Pros: Easy to install, maintains factory functions.

Cons: I lost the factory auxiliary input to my stereo. It seems like this should be an easy fix, especially since my new head unit has an auxiliary input.

PAC RP4-MZ11 Wiring Interface

Written By Anonymous, Salinas ca on Friday, November 15, 2013

Crutchfield Customer Review (What's this?)

Steering wheel control Does not control stereo like the factory stereo.

A disappointment

Written By Joshua C., Blue ridge, GA on Sunday, September 08, 2013

Crutchfield Customer Review (What's this?)

Had to send back the first one because the swi died in less than 24 hours after install. The new one seems to be working fine, but the controls are a wee bit sluggish and sometimes don't work at all...I don't think I'd use this brand again but it is fine for now.

Pros: Mostly does what it says, price, convenience of the bundle

Cons: Sluggish, possible reliability issues (can't truly judge based off the first one) , manual control setup.

PAC RP4-MZ11 Factory Integration Adapter review

Written By JoeR, Frederick, MD on Saturday, August 10, 2013

Crutchfield Customer Review (What's this?)

Product works great, wiring was relatively easy, especially with Crutchfield phone assistence

Pros: Integrates car controls with new head unit

Not for the Beginner

Written By Mark, Wisconsin on Monday, July 08, 2013

Crutchfield Customer Review (What's this?)

Let me first say this product [probably isn't for the first time installer. I am not a first time installer and was able to get it wired and working without issue. This was the perfect solution to allow me to keep my steering wheel controls working. It did take a couple resets to get the controls functioning correctly. I found the easiest way to reset everything is to just disconnect the negative side of the battery and let the car sit for a bit. Reconnect and the adapter was functioning correctly.

Pros: Allowed me to keep my factory steering wheel functions

Cons: Ease of install, not recommended for a beginner Price

First try was a disappointment!

Written By Anonymous, San Bernardino, CA on Friday, May 17, 2013

Crutchfield Customer Review (What's this?)

Did not work! A second unit is being shipped.

Pros: Color coded for easy install. Clear instructions!

Cons: It didn't work with the steering wheel controls. It will be replaced, but I believe an item this expensive should work the first time. It does not come with any connectors. You have to strip the wires / cables and buy the connectors or use black tape to connect it to your receiver.

Hands-on research

What's in the box?

Download owner's manual

  • Radio replacement/SWC interface module (for Mazda)
  • Wiring harness (RP4-MZ11-HAR)
  • Steering wheel control harness (4-pin connector to 3.5mm/blue wire)
  • Instructions

Product Research


Radio Replacement Interface (for Mazda): The PAC RadioPRO 4 Radio Replacement Interface (RP4-MZ11) allows the replacement of the original factory radio in select Mazda vehicles with an upgraded aftermarket head unit. It has been engineered to interface seamlessly with the automobile's computer data bus system, as well as retain important safety and convenience features; such as:

  • Factory amplified audio system (including Bose)
  • Steering wheel controls (SWC)
  • Factory message display
  • Rear seat entertainment (RSE)
  • Navigation based outputs (including vehicle speed sensor, parking brake, & reverse)
  • Accessory 12-volt output
  • Warning chimes
Note: Premium factory amplified systems fader must be adjusted through the RP interface.

Vehicle Compatibility: The RadioPRO 4 (RP4-MZ11) is compatible with select 2006-2013 Mazda vehicles with factory CAN databus radios. Compatible vehicles as of 3/12/2013 include:

Make Model Year
2 Series 2011-2012
3 Series 2008-2012
5 Series 2010-2012
6 Series 2009-2012
CX-5 2013
CX-7 2007-2012
CX-9 2007-2012
MX-5 Miata 2006-2012
RX8 2009-2011
  • If using this interface in a Mazda CX-5, all vehicle settings must be finalized before removing the factory radio.
  • The following vehicles (RX-8, 2007-2009 CX-9 w/non-nav radio, Miata) will not provide a VSS signal as this information is not on the data bus.
  • The following vehicles (RX8, 2007-2009 CX7, 2010 Mazda 5/Miata) will not provide a reverse output as this information is not on the data bus.
  • The following vehicles (RX-8, Miata) will not provide a parking brake output as this information is not on the data bus.
  • The following vehicles (2007-2009 CX-9, 2007-2009 CX-7) have a speed based parking brake wire that will provide a negative trigger until the vehicle is going at least 4 mph.

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.

OEM LCD Compatible: The PAC RadioPRO 4 Interface (RP4-MZ11) retains the vehicle's OEM LCD, so you can still access your vehicle settings. To access the vehicle setting menu, press and hold the Mode button on the SWC until "Setup Menu" is displayed on the LCD screen. Use the Arrow Down on the SWC to scroll through the options. Once the option you wish to select is displayed, press the Mode button on the SWC to advance to the next step.

  • Change Text: Allows you to enter custom text for the LCD screen's default display. Once this is selected, you can use the Volume Up & Down buttons to select the character position and the Arrow Up & Down buttons to select the character. Once you have set your custom text, do not press any buttons for 8 seconds and the programming function will time out and return to the default display.
  • Set Clock: Allows you to set the clock on the LCD screen. Once this is selected you can use the Arrow Down button on the SWC to choose a clock set mode. Once your mode is displayed, press the Mode button on the SWC to select. Follow the instructions on the LCD screen to set the clock.
  • Display Info: Allows you to change vehicle info display such as MPG, miles to empty, etc. Once this is selected, follow the instructions on the LCD screen to change the vehicle info display. Once on the desired display, do not press any buttons for 8 seconds and the programming function will time out and return to the default display.
  • User Options: Allows you to turn off SWC text or reset options to default. SWC text shows you on the LCD screen which button you are pressing on the SWC. Resetting options to default will set the custom text back to audio and if equipped, set the Bose amp settings back to zero. Once this is selected you can use the Arrow Down & Up buttons on the SWC to scroll between SWC Text or Reset. To select either of these press the Mode button. Follow the instructions on the LCD screen for each individual selection.
  • Amp Settings: Allows you to turn Center Point off/on (when available). Allows you to adjust Center Point gain, fader and amp gain, This feature will only be seen on 2007+ CX-7 & CX-9.
  • Exit: Allows you to exit the menu and return to the default display.

Rear Seat Entertainment: The RP4-MZ11 will allow the original factory DVD player and rear screen to function independently from the newly installed aftermarket radio. A/V will be passed  from the factory DVD player to the rear screen and audio can be heard through the headphones. A/V cannot be passed from the factory DVD player to the aftermarket head unit.

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:

Wiring Harness
Wire Color Function
Red/White Parking Brake Output (-)
Purple/white VSS Output
Red Accessory Output (1A)
Green/white 2nd SWC Input
Green Reverse Output (+)
Orange Illumination
Yellow +12V Battery
Black Ground
Blue Amp Turn On Input
Orange/white Illumination
White RCA Left Front Speaker
Grey RCA Right Front Speaker
Green RCA Left Rear Speaker
Purple RCA Right Rear Speaker

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