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PAC RP4-CH21 Wiring Interface

Connect a new car stereo and retain factory steering wheel audio controls, driver info centre, and amp in select 2013-up Dodge and Ram models

Item # 541RP4CH21

The RP4-CH21 wiring interface from PAC lets you replace the factory radio in select 2013-up Dodge and Ram vehicles.

Find what Fits your car

The RP4-CH21 wiring interface from PAC lets you replace the factory radio in select 2013-up Dodge and Ram vehicles.

Item # 541RP4CH21

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In Stock
C$139.99
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About the PAC RP4-CH21 Wiring Interface

PAC's RP4-CH21 interface

The RP4-CH21 wiring interface from PAC lets you replace the factory radio in select 2013-up Dodge and Ram vehicles. This interface will retain factory features including steering wheel audio controls, driver information center, and the audio amplifier once the original radio is removed. The Chrysler-built amplifier only accepts a 2-channel signal, so you will lose fader control with this installation. The interface also does not retain Uconnect or your rear entertainment system.

PAC's RP4-CH21 interface

The RP4-CH21 wiring interface from PAC lets you replace the factory radio in select 2013-up Dodge and Ram vehicles. This interface will retain factory features including steering wheel audio controls, driver information center, and the audio amplifier once the original radio is removed. The Chrysler-built amplifier only accepts a 2-channel signal, so you will lose fader control with this installation. The interface also does not retain Uconnect or your rear entertainment system.

You can also use the interface to assign a secondary function to each steering wheel control, where a short press triggers one functon and a long press accesses another. The RP4-CH21 also gives you connections for retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger, and parking brake, all useful if you're installing a navigation receiver. Warranty: 1 year.

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

READ LESS

What's in the box:

  • Radio replacement interface module
  • Wiring harness
  • SWC harness
  • Instructions

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PAC RP4-CH21 Wiring Interface reviews

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Not exactly what I expected but still worked great.

Crutchfield customer from Forsyth , GA on 5/17/2019

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Although I thought it include everything I needed to connect the head to the truck, I still needed to splice the Kenwood wires to the harness. Dispute this, I am very happy with the result.

Pros:

Cons:

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Bethel, OH on 5/5/2019

2015 Dodge Dart

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This is an awesome addition to my vehicle. Plug and play

Pros: User friendly

Cons: None

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Bloomington, IN on 1/27/2019

2016 Ram 1500

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works!

Pros:

Cons:

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Andre from Pompano Beach, FL on 10/25/2018

2016 Dodge Dart

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it works perfect in my 2016 dodge dart

Pros:

Cons:

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0 of 0 found this helpful

No spahgetti here

Perry from Westminster, MD on 7/24/2018

2016 Ram 1500

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Fairly simple wiring harness

Pros: makes installation a breeze

Cons: none

Crutchfield response on

0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Chickamauga, GA on 6/11/2018

2016 Dodge Dart

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Worked out great

Pros:

Cons:

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0 of 0 found this helpful

Plug & Play

Jim from Martinsburg, WV on 5/7/2018

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Plug and play install. Made the whole process easier.

Pros:

Cons: None

Crutchfield response on

0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

stephen d from Kingman, AZ on 4/17/2018

2017 Ram 1500

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Very simple to install, crutchfield makes installs so easy

Pros: Easy to install

Cons: None!

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Waipahu, HI on 3/31/2018

2014 Ram 1500

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Worked great on my 14 Ram 1500

Pros:

Cons:

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Jarrettsville, MD on 3/27/2018

2013 Ram 1500

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Worked perfect to integrate my new stereo into my 2013 Ram 1500 - everything works great.

Pros:

Cons:

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0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Sweet Water, AL on 3/18/2018

2014 Ram 1500

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THE WIRING INTERFACE WORK GREAT ON MY 2014 RAM BIG HORN.

Pros:

Cons:

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0 of 0 found this helpful

Works Great

John from Clawson, MI on 3/11/2018

2017 Ram 1500

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Worked awesome on my 2017 Ram. Made my stereo installation very simple and quick.

Pros: Easy to follow instructions

Cons: None

Crutchfield response on

0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Kings Mountain, NC on 2/11/2018

2016 Ram 1500

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Love this interface, every thing i needed for a good price

Pros:

Cons:

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0 of 1 found this helpful

PAC RP4-CH21 Wiring Interface

Crutchfield customer from Acworth, GA on 10/20/2017

2014 Dodge Dart

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Does just what is says it does. awesome to be able to keep my steering wheel functions!!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

perfect product

Jason from Millington, TN on 6/26/2017

2016 Dodge Dart

Verified customer (What's this?)
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Perfect for my car. It has all the connections you could possibly need, so all I had to do was cut some short and then splice the rest together. I wish it came with a cable sleeve or something bc it is somewhat a mess, but I quickly fixed that with electrical tape. very intuitive and helped me keep all my steering wheel controls as they were. Also, make sure to read instructions bc it is different for each manufacturer.

Pros: all the connectors

Cons: no cable sleeve

Crutchfield response on

1 of 1 found this helpful

PAC RP4-CH21 Wiring Interface

Matthew from Findlay, OH on 6/10/2017

2016 Dodge Dart

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Fit perfectly in my car and works good exactly what I needed.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

easy install

Derek from Orlando, FL on 4/13/2017

2013 Ram 1500

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These wiring harnesses make life very simple. Amazing product

Pros: Plug and play

Cons: none

Crutchfield response on

0 of 0 found this helpful

PAC RP4-CH21 Wiring Interface

jean carlo from West Palm Beach, FL on 3/13/2017

2014 Ram 1500

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good quality

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

PAC RP4-CH21 2015 RAM 1500 quad cab

Jeremiah from Lincoln, CA on 4/20/2016

2015 Ram 1500

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Verified employee purchase (What's this?)

Worked as advertised, easily installed/wired to the wiring harness from the new deck, easy to program. *Read the manual before you attempt to program, at least 2 times, as timing can be an issue.

Pros: does exactly what it advertises

Cons: none

Crutchfield response on

1 of 1 found this helpful

More customer service than product

Rob from Beverly, Massachusetts on 12/30/2015

2013 Ram 1500

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The product works flawlessly. Directions were simple. Could not have been easier. But that being said, I could have paid less and gotten this anywhere. But I chose, and will always choose, Crutchfield. I know what I am buying is 100% going to work in my car/truck. Price does not matter. When I purchase something, I expect it to work. With this company, it will work (not counting manufacturers defects which can't be controlled). I known these guys since I was a kid in the 70's. Their customer service is impeccable. I wish I remembered who I chatted with online to buy this, but he was spot on. I had some dumb questions that he answered without making me feel stupid. Everything was perfect. He picked out all the items I needed and even put them into my shopping cart. I literally clicked purchase, not even looking. And I was not even worried. Got here fast. Installed my new radio the day after I bought my new truck.

Pros: I will always buy from Crutchfield. No one can compare.

Cons: None.

Crutchfield response on

2 of 3 found this helpful

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More details on the PAC RP4-CH21 Wiring Interface

Stacey B.

Product Research

Features

Radio Replacement Interface: The PAC RP4-CH21 interface allows an aftermarket  head unit replacement of the factory navigation radio in select 2013-up Dodge, Jeep, and Ram vehicles with MS-CAN databus radios. Using this interface will retain factory features such as the factory amplifier, steering wheel controls (SWC), climate control, Driver Information Center (DIC), and vehicle safety warnings when the original radio is removed. The RP4-CH21 also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger, and parking brake.

Vehicle Compatibility: The RadioPro4 (RP4-CH21) is compatible with select 20013-up Dodge, Jeep, and Ram vehicles with MS-CAN databus radios. Compatible vehicles as of 5/6/2015 include:

Make Model Year
Dodge Dart 2013-2014
Durango 2014-2015
Jeep Cherokee 2014-2015
Grand Cherokee 2014-2015
Ram 1500 2013-2015
2500 2013-2015
3500 2013-2015
Promaster 2014

Notes:

  • Not compatible in Dodge Dart vehicles equipped with the 8.4" screen.
  • Not compatible in Ram Promaster trucks equipped with a factory Single-DIN radio.

Retained Factory Features: The RP4-CH21 will retain the following factory features when replacing the factory installed radio in your Dodge, Jeep, Ram vehicle with an aftermarket head unit.

  • Retains factory amplifier (lose fading capability)
  • Retains Driver Information Center (DIC) with vehicle settings
  • Retained Accessory Power (RAP)
  • Retains factory back-up camera
  • Retains HAVC climate controls
  • Retains Blind Spot Detection system
  • Retains Lane Departure Warning System
  • Steering wheel controls

Lost Factory Features: The following factory features are lost when removing the factory radio and replacing it with an aftermarket head unit.

  • Vehicles with factory amplifiers will lose fading capability.
  • The RP4-CH21 does not retain uConnect.
  • In vehicles equipped with the 8.4" uConnect System, the factory compass display on the DIC, 911 assist, WiFi hotspot, and uConnect access will all be lost.
  • Retention of the factory VES system is not currently supported.
  • In vehicles equipped with reverse sensors, but are not equipped with a factory amplified system, the reverse chimes will be lost.
  • Ventilated seats are not supported in Jeep Cherokee, Jeep Grand Cherokee or Dodge Durango.

Driver Information Center (DIC): Your Dodge, Jeep, or Ram vehicle's Drive Information Center is retained along with its vehicle settings; however the following settings are not adjustable once the factory radio is removed.

  • For Ram trucks, Dodge Durango, and Jeep Grand Cherokee
    • Fuel saver display
    • Air suspension settings
    • Forward collision warning with crash mitigation
  • For Jeep Cherokee (with Technology Package)
    • Adaptive cruise control with Stop & Go
    • Advanced brake assist
    • Automatic high-beam headlamp control
    • Blind spot & cross path detection
    • Forward collision warning with crash mitigation
    • LaneSense lane departure warning
    • Parallel & perpendicular park assist
    • Rain sensitive windshield wipers
    • Tilting side mirrors while in reverse
    • Power lift gate chime

Navigation Outputs: The PAC radio replacement interface also provides a VSS (vehicle speed sense), Parking Brake, and a Reverse Gear output to make installing an aftermarket navigation head unit simpler and less time consuming.

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.

Switch Position 1 2 3 4 7 8 9
Radio Alpine JVC Kenwood Clarion Pioneer/Other Sony Fusion

Programmable SWC: 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 or create secondary functions. The SWC functions can be easily programmed; see default SWC button assignments in the included user manual. The interface retains programming even if your vehicle's battery is disconnected.

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 and newer JVC receivers. The 3.5mm jack supports Alpine, Jensen, Older JVC, Clarion, Pioneer, Sony, and Dual radios. Not compatible with Soundstream head units.

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/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 -
Purple Right Rear Speaker +
Purple/Black Right Rear Speaker -
Red/White Parking Brake Detection (-)
Purple/White VSS Output
Green Reverse Output (+)

RadioPRO App: PAC offers a Windows compatible RadioPRO App software program to help you configure the interface.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
your site vehicle tool says it fits my truck [ Anthony  Dec 10, 2017 ]
A
Easy and cheaper for the installer to keep my factory setting on my 2016 Dodge Dart. [ Winford  Aug 07, 2017 ]
A
CJ recommended it [ Christopher  Jun 24, 2017 ]
A
Great way to keep steering controls [ Ian  Apr 01, 2017 ]
A
Recommended with installation kit [ Beth  Nov 27, 2016 ]
A
Needed it to connect an aftermarket head unit in my 2013 dodge dart. [ Daniel  Nov 01, 2016 ]
A
to ensure I could use the steering wheel controls [ Clayton  Dec 03, 2015 ]
SHOW MORESHOW LESS

3 questions already asked

Q
Will this work on a 2016 Ram 2500 Cummins? Retain Steering wheel controls & Factory Back-Up Camera and or Back-Up sensor chimes?
[ Braden  Jan 21, 2017 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Kenny  Jan 21, 2017 ]  Staff
Q
Question. My 14 Ram steering wheel does NOT have radio controls but has a phone button that activates the phone control on the factory radio. Will this connect this button to new pioneer radio or do I not need this for installation?
[ Richard  Nov 25, 2016 ]
1 answer
A
The ability to retain steering wheel controls with aftermarket receivers will be determined by the receiver you are using and the vehicle you have. For full information on this type of integration (including the parts you will need) please contact an Advisor by phone (1-800-324-9695) or online chat.
[ Kenny  Nov 25, 2016 ]  Staff
Q
Installed this in my car. Stock mic was not retained for some reason anyone else have a similar issue? 2013 Dart.
[ Kevin  Nov 15, 2015 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Nov 15, 2015 ]  Staff

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