PAC RP4-CH21 User Manual Download Page 2

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 2

Rev: 2

Date: 041218

Installation Steps 

1.  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.

2.  Make all connections as described in the connection chart on page 1. 

Vehicles without a factory amplifier:

 Connect the 

aftermarket radio’s front and rear speaker wires to the vehicle connector. 

Vehicles with a factory amplifier:

 Connect the 

front outputs of the aftermarket radio to the rear inputs of the vehicle connector. This will allow navigation voice prompts and 

Bluetooth calls to be heard.

Illustration / Schematic

Aftermarket Radio

Connections

Vehicle 

Connector

SWC Connection

x4

See above chart for 
different radio type 
connections

Acc On/

Programming 

LED

Programming 

Button

Wiring

SWC Connection

Wiring Connection Chart

Red / White

Parking Brake 

Output (-)

Purple / White

Vehicle Speed 

Output 

Blue / White

Amp Turn On Input

Red

Accessory Output 

Output (10 amp)

Orange / White

Illumination Output 

(+)

Green

Reverse Output (+)

Interface Connector

Yellow

B12v

Black

Ground

White

Front L + input

White / Black

Front L - input

Grey

Front R + input

Grey / Black

Front R - input

Green

Rear L + input

Green / Black

Rear L - input

Purple

Rear R + input

Purple / Black

Rear R - input

Yellow RCA

Factory Reverse 

Camera Video (if 

equipped)

Vehicle Connector

SWC Connector

Blu/Yel

Kenwwod, Newer 

JVC

3.5mm Jack

Alpine, JVC, 

Clarion, Fusion, 

Pioneer, Sony, 

Boyo, Dual, 

Lightning Audio,  

Visteon or Advent

2 3 4 5

 6 7 

8 9

 0

 

Alpine

JVC

Kenwood /  

Lightning Audio

Clarion / 

Nakamichi

Pioneer / 

Other*

Sony

Fusion

1

2

3

4

7

8

9

*Other - Dual / Axxera (these brands could also have 2 - wire resistive), Jensen, Rockford Fosgate 

SET RADIO SELECT SWITCH

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