PAC Audio GM1A-RS Instruction Manual
Radio Replacement Interface with
GM1A-RS
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Introduction and Features
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 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 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.
Important Notes
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 nd 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 amplier at all, or if you are connecting an aftermarket amplier 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 specic 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
Interface
Connector 1
Interface
Connector 2
Connector
Radio Select
DIP Switches
Adjustment Dial
Chime
LED 2
Programming
Button
LED 1
USB Port
Expansion
Port
Installation Steps
Set DIP switches that correspond with your radio to the ON position.
Set all other DIP switches to the OFF position.
Alpine JVC
1 2 1 & 2 3 2 & 3 1, 2, & 3 4 1 & 4
Other =
*Other - Dual / Axxera (these brands could also have 2-wire resistive), Jensen, Rockford Fosgate
Advent, BOYO, Dual, Lightning Audio, Rockford Fosgate, Visteon
Kenwood /
Lightning Audio
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 amplied 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 amplied systems or very low audio in non-amplied 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.
Clarion /
Nakamichi
2-Wire
Resistive
Pioneer /
Other*
Sony Fusion
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
Page 1
GM1A-RS
(
y)
Installation Steps (cont.)
5. Remove the factory radio and plug in the GM1A-RS’s vehicle harness into the factory
vehicle harness.
6. If you wish to reassign functions to the SWC, follow the programming instructions in
the next section.
7. If the vehicle has a standard Bose system, does not have a factory amplier at all,
or if you are connecting an aftermarket amplier to the cabin speakers, connect the
chime speaker to the chime connector on the interface and install the chime speaker
in a place free of obstructions where it can be easily heard (usually low in the dash
facing downward).
Interface Connector 1
Vehicle Connector 1
Interface Connector 2
Amplied
Line Output
Converter (LOC-1)
Interface Connector 3
Non-Amplied
Chime Speaker
Radio Replacement Interface with
Steering Wheel Control Retention
for select General Motors Vehicles
with Class II Data-Bus
Wiring Connections
Yellow 12v+
Red
Black Ground
Blue / White Remote On Input
Orange Not Used
Orange / White Illumination Output (+)
Purple / White Reverse Output (+)
Blue / Yellow SWC Output / Key 1
Brown SWC Output / Key 2
3.5 mm Jack SWC Output
Light Green Parking Brake Output (-)
Pink Vehicle Speed Signal
Purple Rear R + input
Purple / Black Rear R - input
Green Rear L + input
Green / Black Rear L - input
Gray Front R + input
Gray / Black Front R - input
White Front L + input
White / Black Front L - input
Accessory Output
(10 amp)
Output (VSS)
VS41 Wiring
The VS41 can be connected to the GM1A-RS and used to switch multiple cameras. Please refer to the document
labeled “Instructions for wiring the VS41 into 2003-2006 Chevy / GMC Trucks and SUVs” which can be found on
www.pac-audio.com under the VS41 product page.
Adjustable Settings
These products have settings that are adjustable through our RadioPRO PC app or through the push-button on the module.
Some settings are only adjustable through the PC app. Some of these settings require the module to be connected to the
vehicle. Below is a breakdown of these settings.
AVAILABLE ON PC APP
CONNECTED TO CAR NOT CONNECTED TO CAR
Chime volume (excluding Premium Bose Y91/UQA) YES NO YES
Factory amplifier settings:
Bass, Mid, Treble, Gain, and Fade
Premium Bose Y91/UQA onl
OnStar volume (RST or RT products only) YES NO YES
Read product version YES YES N/A
Update firmware YES YES N/A
Camera settings (VS41 required) YES YES NO
Related Downloads
• RadioPRO PC App - http://aampglobal.com/RadioProApp
• Latest instruction manuals - search part number on pac-audio.com, and look on “Downloads” tab
YES NO GAIN ONLY
AVAILABLE ON MODULESETTING
© 2018 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com
Rev: V8
Date: 080118
Page 2
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