Radio Replacement and Steering Wheel Control Interface
for Select General Motors Vehicles
RP4-GM31
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Page 1
Rev: 3
Date: 120618
Introduction and Features
Important Notes
Wiring Connection Chart
Illustration / Schematic
The RP4-GM31 interface allows the replacement of a factory radio in select General Motors vehicles with 29-bit LAN
radios. Using this interface will retain factory features such as steering wheel controls (SWC), Warning Chimes, Rear
Seat Controls (RSC) and the BOSE amplier when 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-GM31 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 only apply to R.1.2.3a.8 or later revisions. The revision info can be found on a small white sticker on
the interface and packaging.
2. 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 below for setting chart).
3. 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 or utilize short press / long press dual command functionality. The SWC
can always be restored to default settings by pressing and releasing the program button on the side of the interface
once, and waiting 7 seconds for the LED to ash 4 times.
4. RSC buttons that are identical to the SWC will mimic the SWC one for one.
5. To prevent over driven audio when installing into a vehicle with a Bose system and the aftermarket radio does not have
low level outputs, a 4 channel or two 2 channel LOC’s are recommended to match the input voltage. We recommend the
LP5-4 or two LP5-2 or any other LOC that have the same characteristics as the LP5-4 or LP5-2.
6. To prevent ground loop or engine noise when installing aftermarket radios that use a common ground on the RCA
outputs, a pair of ground loop isolators (part # SNI-1 or LPGL-2) are required.
7. The LED will ash whenever a SWC button is pressed.
Interface Connector
See above chart for
wire color descriptions.
Vehicle Connector
See above chart for
wire color description.
SWC Connection
See above chart for
different radio type
connections
x4
Acc On/
Programming
LED
Programming
Button
Wiring SWC Connection
Light Green Parking Brake Output (-)
Pink Vehicle Speed Output
Blue / White Amp Turn On Input
Red
Accessory Output
(10 amp)
Orange / White Illumination Output (+)
Purple / White
Reverse Output (+)
Interface Connector
Yellow Battery +12v
Black Ground
Blue Antenna On Input
White Front Left + input
White / Black Front Left - input
Gray Front Right + input
Gray / Black Front Right - input
Green Rear Left + input
Green / Black Rear Left - input
Purple Rear Right + input
Purple / Black Rear Right - input
Vehicle Connector
SWC Connector
Blue / Yellow
Kenwood,
Newer JVC
3.5mm Jack
Alpine, JVC, Clarion,
Fusion, Pioneer,
Sony, Boyo, Dual,
Lightning Audio,
Visteon or Advent
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