PAC GM3A-RSTX User Manual

Radio Replacement and Steering Wheel Control Interface
with OnStar Retention for General Motors Vehicles
GM3A-RSTX
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Page 1
Rev: 1
Date: 100318
Introduction and Features
Important Notes
Wiring Connection Chart
Illustration / Schematic
The GM3A-RSTX 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 OnStar, steering wheel controls (SWC), warning chimes,
Rear Seat Controls (RSC), factory XM Radio and the BOSE amplier 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 GM3A-RSTX also provides data bus driven outputs such as retained accessory power
(RAP), vehicle speed signal (VSS), illumination, reverse trigger and parking brake.
1. These instructions only apply to R.2.6.6.19 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 next page for setting chart).
3. 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 following the procedure outlined on page 2.
4. RSC buttons that are identical to the SWC will mimic the SWC one for one.
5. The LED will ash whenever a SWC button is pressed.
Light Green Parking Brake Output (-)
Pink Vehicle Speed Output
Blue Not Used
Blue / White Amp Turn On Input
Orange / White Illumination Output (+)
Purple / White Reverse Output (+)
Brown Loop
Mute Loop - See
installation note 8.
Aftermarket Radio Connections
Yellow * +12v from RP Advanced
Yellow * +12v from vehicle
Black ** Ground from RP Advanced
Black ** Ground from vehicle
Red Acc. Output
White Front Left + input
White / Black Front Left - input
Grey Front Right + input
Grey / Black Front Right - input
Green Rear Left + input
Green / Black Rear Left - input
Purple Rear Right + input
Purple / Black Rear Right - input
SWC Connector
Blue / Yellow Kenwood, Newer JVC
3.5mm Jack
Alpine, JVC, Clarion,
Pioneer, Sony, Fusion,
Boyo, Dual, Lightning
Audio, Visteon or
Advent
SWC Connection
See above chart for
different radio type
connections
x3
Wiring SWC Connection
XM R
XM L
Aftermarket
Radio
Connections
Vehicle
Connections
Pacific Accessory Corporation
IMPORTANT NOTES REGARDING YELLOW AND BLACK WIRE CONNECTIONS
* Connect both Yellow wires from the RP Advanced harnesses to the radio’s 12v
constant input
** Connect both Black wires from the RP Advanced harnesses to the radio’s ground
input.
Factory reverse camera and
auxiliary input retention harness
Power and speaker
connections

PAC GM3A-RSTX Specifications

General

Input Channels	2
Bit Depth	24-bit
Headphone Output	1/4" TRS
Input Type	XLR/TRS combo
Phantom Power	48V
Monitor Output	1/4" TRS
Power Source	USB Bus Power
Compatibility	Windows, macOS

Summary

Introduction and Features

Important Notes

Key points and considerations for using the GM3A-RSTX interface, including revision info and switch settings.

Wiring Connection Chart

Details aftermarket radio and SWC connector wiring, including specific wire functions and colors.

Wiring Illustration and Schematic

Diagram illustrating the physical connections for power, speakers, and vehicle interfaces.

Installation Steps

Set Radio Select Switch

Instructions for adjusting the rotary switch on the interface to match the connected vehicle's radio.

Default Steering Wheel Control Programming

Overview of pre-programmed SWC functions and how to restore default settings.

Default SWC Button Assignments

Table showing default assignments for steering wheel control buttons for various radio brands.

Optional Steering Wheel Control Programming

Guide for reassigning SWC functions, using dual command functionality, and mode selection.

Optional Steering Wheel Control Programming (Continued)

Factory Mode vs Aftermarket Mode

Explanation of two modes for controlling OnStar/XM functions, affecting SWC button assignments.

SWC Programming Instructions

Step-by-step guide on how to program custom SWC assignments and dual command functionality.

Optional Steering Wheel Control Programming (Continued)

Optional Programming Order

Chart detailing the sequence for programming specific SWC functions for different radio brands.

Testing and Verification

Testing and Verification Steps

Procedures to verify correct operation of the interface, radio, SWC, and OnStar functions.

Using Rear Seat Audio Controls

Using Radios Dual Zone Source

How to use the aftermarket radio's dual zone audio output with the rear seat controls.

Using Factory XM Radio Tuner

Instructions for controlling the factory XM tuner using the interface and SWC buttons.

Using Factory XM Tuner With SWC

Detailed steps to activate, control, and store presets for the factory XM tuner via SWC.

Rear Seat Entertainment (RSE)

RSE Configuration Scenarios

Details for vehicles with overhead screens only or with additional headrest monitors.

OnStar Volume Adjustment for Vehicles without SWC

Technical Support and Product Updates