Radio Replacement & Steering Wheel Control Interface
for Dodge/Jeep/Ram Vehicles
RP4-CH21
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Page 1
Rev: 2
Date: 041218
Introduction & Features
Important Notes
The RP4-CH21 interface allows the replacement of a factory radio in select Dodge/Jeep/Ram vehicles with MS-CAN
databus radios. Using this interface will retain factory features such as steering wheel controls (SWC), HVAC controls,
Driver Information Center (DIC), vehicle settings, vehicle safety features and the factory audio amplier whenever the
original radio is removed. Use of this interface also allows you to program two radio functions to each SWC button by
using short press long press dual command functionality. 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.
1. These instructions apply to r.1.5.1.4 or later revisions. The revision info can be found on a small white sticker on the interface
and packaging.
1. Please make your vehicle settings selections before removing the factory radio for optimal installation time. Once the radio has
been removed, the vehicle settings which are normally selected through the factory radio can be accessed by downloading
and installing the PAC Vehicle Settings program from http://www.pac-audio.com/rmware/RP/index.html. A PAC-UP is
required to connect with the interface. Please see page 6 for further details on the vehicle settings app.
2. Vehicles with a factory amplier: The factory amplier only accepts two channels of audio input (left and right). Fading is
not supported in these applications. The factory amplier’s fading is controlled by data communication from the factory radio.
Neither the aftermarket radio or the RP interface have the ability to control the amplier’s fader.
3. Vehicles equipped with VES: Retention of the VES system is not currently supported
4. The active guide lines for the factory reverse camera can be turned off and on in the vehicle settings app referenced above.
5. In vehicles equipped with the 8.4” uConnect system, the factory compass display on the DIC, 911 assist, WiFi hotspot and
uConnect access will be lost.
6. 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 (see next page for setting chart).
7. The interface comes pre-programmed for all of the vehicles factory SWC functions and does not require programming unless
you wish to re-assign the SWC functions or utilize short press long press dual command functionality. The SWC can always
be restored to default settings by pressing and releasing the programming button on the side of the interface once and waiting
7 seconds for the LED to ash 4 times.
8. The LED will ash whenever a programmable SWC button is pressed.
9. uConnect is not retained when using this interface
10. RAM Promaster equipped with a single DIN radio is not compatible
11. Dodge Durango - You will lose the button from radio to ip down third row headrests. Users will have to control rear climate
controls from the controls located in the rear roof. Ventilated seats are not supported.
12. Jeep Grand Cherokee: Ventilated seats are not supported
13. Jeep Cherokee: Ventilated seats are not supported
14. All vehicle settings will be retained, however the following settings are not adjustable once the factory radio is removed:
• RAM Trucks/Grand Cherokee/Durango
• Fuel Saver Display
• Air Suspension Settings
• Forward Collision Warning with Crash Mitigation
• Cherokee (With Technology Package)
• Adaptive Cruise Control with Stop and Go
• Advanced Brake Assist
• Automatic High Beam Headlamp Control
• Blind Spot and Cross Path Detection
• Forward Collision Warning with Crash Mitigation
• LaneSense Lane Departure Warning
• Parallel and Perpendicular Park Assist
• Rain Sensitive Windshield Wipers
• Tilting Side Mirrors While in Reverse
• Power Lift Gate Chime
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