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PAC RP4-CH21 Wiring Interface

Connect a new car stereo and retain factory steering wheel audio controls, driver info center, 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.

Read more from Crutchfield writer, Bob B.

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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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More details on the PAC RP4-CH21 Wiring Interface

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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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