GM1A-RS
Radio Replacement Interface with
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Pacific Accessory Corporation
Rev: V8
Date: 080118
Page 1
Introduction and Features
Important Notes
The GM1A-RS interface allows the replacement of a factory radio in select General Motors vehicles with the Class II Data-Bus.
Using this interface will retain factory features such as steering wheel controls (SWC), rear seat controls, warning chimes and the
factory Bose amplifier
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 GM1A-RS provides data bus driven outputs
such as retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse trigger and parking brake. You can
also add multiple camera inputs to your aftermarket radio with Data-Bus controlled automatic activation (front camera only) by
connecting a VS41 into the expansion port on the GM1A-RS.
1. Set the Radio Select DIP switches according to the radio you are installing.
2. Wire your aftermarket radio to the GM1A-RS’s harness according to the wiring connections chart on the next page.
3. Plug Interface Connectors 1 and 2 into the appropriate port on the GM1A-RS interface (using the illustration above or the
label on the bottom of the interface).
4. Plug interface connector 3 into the LOC-1 module. Connection will be dependent upon whether or not the vehicle has a
factory amplified system. Plug this connector into the appropriate port on the included line output converter (Part # LOC-1;
using the illustration on the next page or the text stamped into the housing). Improper connection will result in either very
over-driven audio in amplified systems or very low audio in non-amplified systems. If this occurs, disconnect the harness from
the LOC-1 Module, and connect it into the port on the opposite side of the LOC-1.
Installation Steps
USB Port
Expansion
Port
Interface
Connector 2
Interface
Connector 1
Chime
Connector
Programming
Button
Adjustment Dial
LED 2
LED 1
Radio Select
DIP Switches
Other =
Advent, BOYO, Dual, Lightning Audio, Rockford Fosgate, Visteon
Alpine
JVC
Kenwood /
Lightning Audio
Clarion /
Nakamichi
2-Wire
Resistive
Pioneer /
Other*
Sony
Fusion
1
2
1 & 2
3
2 & 3
1, 2, & 3
4
1 & 4
Set DIP switches that correspond with your radio to the ON position.
Set all other DIP switches to the OFF position.
*Other - Dual / Axxera (these brands could also have 2-wire resistive), Jensen, Rockford Fosgate
1. Does not retain OnStar.
2. Does not provide RSE audio to aftermarket radio.
3. Compatible in both Premium (Y91 / UQA) and Standard Bose systems.
4. Aftermarket radios with a 2-wire resistive based SWC circuit will not have default button assignments programmed. Please
refer to the owners manual of the radio you are installing to find out the proper SWC programming procedure.
5. The included chime speaker should be used when: The vehicle has a standard Bose system (UQ7), the vehicle does not have
a factory amplifier at all, or if you are connecting an aftermarket amplifier to the cabin speakers.
6. The Programming Button and Adjustment Dial on the side of the interface have multiple functions. Please see Page 2 for
more details.
7. When used in conjunction with the add on camera controller (VS41) the GM1A-RS will only provide Data-Bus controlled
automatic activation for the front camera
. Please refer to the vehicle specific VS41 instructions for more detail.
8. Fade is adjusted using the RadioPRO app, available at https://aampglobal.com/RadioProApp. The GM1A-RX module needs
to be connected to the vehicle, and the PC, to adjust chime volume.
9. In vehicles with Premium Bose (Y91 / UQA), dynamic fade is only supported by GM1A-RT and GM1A-RST.
Module Layout
